{"ok":true,"stats":{"total":370,"latest":"2026-07-26 13:18:10"},"tables":["pcp_chess_puzzles","chess_puzzles"],"selected":{"id":392,"puzzle_hash":"f1cb1c7f43a20859cc799cdb13ff4ce3480f5fba3e0ef9ce4b9c486d955adf33","fen":"7R/4b1Qp/3k3p/3pNKP1/5nP1/7n/r2B3q/r7 b - - 0 1","line_san":"1...Qh1?? 2.Qxe7+!! Kxe7 3.Bb4#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qe4#","material_note":"added ra1, ra2, ph6, ph7; material -3 -> 9; eval -738 -> +327 cp","payload":"{\"puzzle_hash\":\"f1cb1c7f43a20859cc799cdb13ff4ce3480f5fba3e0ef9ce4b9c486d955adf33\",\"fen\":\"7R/4b1Qp/3k3p/3pNKP1/5nP1/7n/r2B3q/r7 b - - 0 1\",\"line_san\":\"1...Qh1?? 2.Qxe7+!! Kxe7 3.Bb4#\",\"generator_seed\":2695706857,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, 0), ('K', -1, -2), ('N', -1, -1), ('P', -2, -3), ('P', -1, -3), ('Q', 1, -3), ('R', 2, -4), ('b', 1, -1), ('k', 0, 0), ('n', -3, -4), ('n', -2, -2), ('p', -1, 0), ('p', 0, -4), ('p', 1, -4), ('q', -4, -4), ('r', -5, 3), ('r', -4, 3))\",\"solution_key\":\"san:Qh1 Qxe7 Kxe7 Bb4\",\"answer_key\":\"answer:Qxe7 Kxe7 Bb4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qe4#\",\"threat_uci\":\"h1e4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e5, e6 in the mate net.\",\"material_note\":\"added ra1, ra2, ph6, ph7; material -3 -> 9; eval -738 -> +327 cp\",\"force_notes\":[\"Only Qxe7+ wins; 24 quiet moves allow mate in 1.\",\"7 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe7 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qe4#\",\"THREAT_UCI: h1e4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e5, e6 in the mate net.\",\"MATERIAL: added ra1, ra2, ph6, ph7; material -3 -> 9; eval -738 -> +327 cp\",\"FORCE: Only Qxe7+ wins; 24 quiet moves allow mate in 1.\",\"FORCE: 7 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe7 forced\"]}","created_at":"2026-07-26 13:18:10","_table":"pcp_chess_puzzles"},"puzzles":[{"id":392,"puzzle_hash":"f1cb1c7f43a20859cc799cdb13ff4ce3480f5fba3e0ef9ce4b9c486d955adf33","fen":"7R/4b1Qp/3k3p/3pNKP1/5nP1/7n/r2B3q/r7 b - - 0 1","line_san":"1...Qh1?? 2.Qxe7+!! Kxe7 3.Bb4#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qe4#","material_note":"added ra1, ra2, ph6, ph7; material -3 -> 9; eval -738 -> +327 cp","payload":"{\"puzzle_hash\":\"f1cb1c7f43a20859cc799cdb13ff4ce3480f5fba3e0ef9ce4b9c486d955adf33\",\"fen\":\"7R/4b1Qp/3k3p/3pNKP1/5nP1/7n/r2B3q/r7 b - - 0 1\",\"line_san\":\"1...Qh1?? 2.Qxe7+!! Kxe7 3.Bb4#\",\"generator_seed\":2695706857,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, 0), ('K', -1, -2), ('N', -1, -1), ('P', -2, -3), ('P', -1, -3), ('Q', 1, -3), ('R', 2, -4), ('b', 1, -1), ('k', 0, 0), ('n', -3, -4), ('n', -2, -2), ('p', -1, 0), ('p', 0, -4), ('p', 1, -4), ('q', -4, -4), ('r', -5, 3), ('r', -4, 3))\",\"solution_key\":\"san:Qh1 Qxe7 Kxe7 Bb4\",\"answer_key\":\"answer:Qxe7 Kxe7 Bb4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qe4#\",\"threat_uci\":\"h1e4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e5, e6 in the mate net.\",\"material_note\":\"added ra1, ra2, ph6, ph7; material -3 -> 9; eval -738 -> +327 cp\",\"force_notes\":[\"Only Qxe7+ wins; 24 quiet moves allow mate in 1.\",\"7 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe7 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qe4#\",\"THREAT_UCI: h1e4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e5, e6 in the mate net.\",\"MATERIAL: added ra1, ra2, ph6, ph7; material -3 -> 9; eval -738 -> +327 cp\",\"FORCE: Only Qxe7+ wins; 24 quiet moves allow mate in 1.\",\"FORCE: 7 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe7 forced\"]}","created_at":"2026-07-26 13:18:10","_table":"pcp_chess_puzzles"},{"id":391,"puzzle_hash":"f34bf711e14fcaa162ad55a7ae7dba1ce94f85799e4b85aaf1ad42d591f6533d","fen":"1rn2r2/4p3/p7/ppK1k1B1/3pb3/4Q3/3R2P1/5B2 b - - 0 1","line_san":"1...Rb6?? 2.Qxe4+!! Kxe4 3.Bd3+ Ke5 4.Re2#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rc6#","material_note":"added rf8, pe7; material -6 -> 0; eval +91 -> +684 cp","payload":"{\"puzzle_hash\":\"f34bf711e14fcaa162ad55a7ae7dba1ce94f85799e4b85aaf1ad42d591f6533d\",\"fen\":\"1rn2r2/4p3/p7/ppK1k1B1/3pb3/4Q3/3R2P1/5B2 b - - 0 1\",\"line_san\":\"1...Rb6?? 2.Qxe4+!! Kxe4 3.Bd3+ Ke5 4.Re2#\",\"generator_seed\":3639731278,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -1), ('B', 0, -2), ('K', 0, 2), ('P', -3, -2), ('Q', -2, 0), ('R', -3, 1), ('b', -1, 0), ('k', 0, 0), ('n', 3, 2), ('p', -1, 1), ('p', 0, 3), ('p', 0, 4), ('p', 1, 4), ('p', 2, 0), ('r', 3, -1), ('r', 3, 3))\",\"solution_key\":\"san:Rb6 Qxe4 Kxe4 Bd3 Ke5 Re2\",\"answer_key\":\"answer:Qxe4 Kxe4 Bd3 Ke5 Re2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rc6#\",\"threat_uci\":\"b6c6\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d4, d5, d6 in the mate net.\",\"material_note\":\"added rf8, pe7; material -6 -> 0; eval +91 -> +684 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe4 forced\"},{\"ply\":4,\"text\":\"Ke5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rc6#\",\"THREAT_UCI: b6c6\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d4, d5, d6 in the mate net.\",\"MATERIAL: added rf8, pe7; material -6 -> 0; eval +91 -> +684 cp\",\"NOTE 2: Kxe4 forced\",\"NOTE 4: Ke5 forced\"]}","created_at":"2026-07-26 13:17:23","_table":"pcp_chess_puzzles"},{"id":390,"puzzle_hash":"a1b5b5136e8567ae03fbbc45fe3a2a359052cfb79be00354a95a0162c7e3a96e","fen":"Q6R/PrNp1r2/1k1K1p2/pN1n4/8/1b6/8/1q6 b - - 0 1","line_san":"1...Qe4?? 2.Qxb7+!! Kxb7 3.Rb8#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qe5#","material_note":null,"payload":"{\"puzzle_hash\":\"a1b5b5136e8567ae03fbbc45fe3a2a359052cfb79be00354a95a0162c7e3a96e\",\"fen\":\"Q6R/PrNp1r2/1k1K1p2/pN1n4/8/1b6/8/1q6 b - - 0 1\",\"line_san\":\"1...Qe4?? 2.Qxb7+!! Kxb7 3.Rb8#\",\"generator_seed\":2982560048,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('K', -2, 0), ('N', -1, -1), ('N', 0, 1), ('P', 1, -1), ('Q', 1, -2), ('R', -6, -2), ('b', 0, 3), ('k', 0, 0), ('n', -2, 1), ('p', -4, 0), ('p', -2, -1), ('p', 1, 1), ('q', 0, 5), ('r', -4, -1), ('r', 0, -1))\",\"solution_key\":\"san:Qe4 Qxb7 Kxb7 Rb8\",\"answer_key\":\"answer:Qxb7 Kxb7 Rb8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qe5#\",\"threat_uci\":\"e4e5\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c5, c6, c7 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxb7+ stops mate in 1; 26 other moves lose immediately.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxb7 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qe5#\",\"THREAT_UCI: e4e5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c5, c6, c7 in the mate net.\",\"FORCE: Only Qxb7+ stops mate in 1; 26 other moves lose immediately.\",\"NOTE 2: Kxb7 forced\"]}","created_at":"2026-07-26 13:07:49","_table":"pcp_chess_puzzles"},{"id":389,"puzzle_hash":"edef8882b960f916516dbd479020ab40ab3acf884513b1cc055cbf38c2e237a7","fen":"4r1q1/4p1p1/4p3/4N1K1/4p1P1/Q5bk/R6N/8 b - - 0 1","line_san":"1...Qh7?? 2.Qxg3+!! Kxg3 3.Nf1+ Kh3 4.Rh2#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qh6#","material_note":"added pe4, pe7; material -2 -> 0; eval +19 -> +125 cp","payload":"{\"puzzle_hash\":\"edef8882b960f916516dbd479020ab40ab3acf884513b1cc055cbf38c2e237a7\",\"fen\":\"4r1q1/4p1p1/4p3/4N1K1/4p1P1/Q5bk/R6N/8 b - - 0 1\",\"line_san\":\"1...Qh7?? 2.Qxg3+!! Kxg3 3.Nf1+ Kh3 4.Rh2#\",\"generator_seed\":3471873619,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('K', -2, -1), ('N', -2, -3), ('N', 1, 0), ('P', -1, -1), ('Q', 0, -7), ('R', 1, -7), ('b', 0, -1), ('k', 0, 0), ('p', -4, -3), ('p', -4, -1), ('p', -3, -3), ('p', -1, -3), ('q', -5, -1), ('r', -5, -3))\",\"solution_key\":\"san:Qh7 Qxg3 Kxg3 Nf1 Kh3 Rh2\",\"answer_key\":\"answer:Qxg3 Kxg3 Nf1 Kh3 Rh2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qh6#\",\"threat_uci\":\"h7h6\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers g4, h4 in the mate net.\",\"material_note\":\"added pe4, pe7; material -2 -> 0; eval +19 -> +125 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg3 forced\"},{\"ply\":4,\"text\":\"Kh3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qh6#\",\"THREAT_UCI: h7h6\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers g4, h4 in the mate net.\",\"MATERIAL: added pe4, pe7; material -2 -> 0; eval +19 -> +125 cp\",\"NOTE 2: Kxg3 forced\",\"NOTE 4: Kh3 forced\"]}","created_at":"2026-07-26 13:03:58","_table":"pcp_chess_puzzles"},{"id":388,"puzzle_hash":"322d06be6838930fd6c94aaf30dbe301429631b30a14902c38995d34aa3fb742","fen":"5r2/qp2n3/2k1Kp2/P1b2Q2/7R/N7/8/8 b - - 0 1","line_san":"1...Qb8?? 2.Qxc5+!! Kxc5 3.Rc4#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qc8#","material_note":null,"payload":"{\"puzzle_hash\":\"322d06be6838930fd6c94aaf30dbe301429631b30a14902c38995d34aa3fb742\",\"fen\":\"5r2/qp2n3/2k1Kp2/P1b2Q2/7R/N7/8/8 b - - 0 1\",\"line_san\":\"1...Qb8?? 2.Qxc5+!! Kxc5 3.Rc4#\",\"generator_seed\":483375802,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('K', -2, 0), ('N', 2, -3), ('P', 2, -1), ('Q', -3, -1), ('R', -5, -2), ('b', 0, -1), ('k', 0, 0), ('n', -2, 1), ('p', -3, 0), ('p', 1, 1), ('q', 2, 1), ('r', -3, 2))\",\"solution_key\":\"san:Qb8 Qxc5 Kxc5 Rc4\",\"answer_key\":\"answer:Qxc5 Kxc5 Rc4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qc8#\",\"threat_uci\":\"b8c8\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d5, d6, d7 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxc5+ meets the threat cleanly; 32 quiet moves still lose immediately.\",\"Non-direct tries checked: Rd4.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qc8#\",\"THREAT_UCI: b8c8\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d5, d6, d7 in the mate net.\",\"FORCE: Only Qxc5+ meets the threat cleanly; 32 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Rd4.\",\"NOTE 2: Kxc5 forced\"]}","created_at":"2026-07-26 12:57:58","_table":"pcp_chess_puzzles"},{"id":387,"puzzle_hash":"26b32f9c27c5dcfc7b5abce8a12e71b13d616d0aed54896c4bae8095b0e7fe15","fen":"8/8/3BQ1p1/3R2P1/2B2PK1/4b3/1r3kp1/4n1q1 b - - 0 1","line_san":"1...Qh2?? 2.Qxe3+!! Kxe3 3.Bc5+ Ke4 4.Re5#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens g1=Q#","material_note":"added rb2; material -5 -> 0; eval -82 -> +259 cp","payload":"{\"puzzle_hash\":\"26b32f9c27c5dcfc7b5abce8a12e71b13d616d0aed54896c4bae8095b0e7fe15\",\"fen\":\"8/8/3BQ1p1/3R2P1/2B2PK1/4b3/1r3kp1/4n1q1 b - - 0 1\",\"line_san\":\"1...Qh2?? 2.Qxe3+!! Kxe3 3.Bc5+ Ke4 4.Re5#\",\"generator_seed\":147760767,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -2), ('B', -2, -3), ('K', -2, 1), ('P', -3, 1), ('P', -2, 0), ('Q', -4, -1), ('R', -3, -2), ('b', -1, -1), ('k', 0, 0), ('n', 1, -1), ('p', -4, 1), ('p', 0, 1), ('q', 1, 1), ('r', 0, -4))\",\"solution_key\":\"san:Qh2 Qxe3 Kxe3 Bc5 Ke4 Re5\",\"answer_key\":\"answer:Qxe3 Kxe3 Bc5 Ke4 Re5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens g1=Q#\",\"threat_uci\":\"g2g1q\",\"threat_piece\":\"P=Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f3, g3 in the mate net.\",\"material_note\":\"added rb2; material -5 -> 0; eval -82 -> +259 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe3 forced\"},{\"ply\":4,\"text\":\"Ke4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens g1=Q#\",\"THREAT_UCI: g2g1q\",\"THREAT_PIECE: P=Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f3, g3 in the mate net.\",\"MATERIAL: added rb2; material -5 -> 0; eval -82 -> +259 cp\",\"NOTE 2: Kxe3 forced\",\"NOTE 4: Ke4 forced\"]}","created_at":"2026-07-26 12:52:02","_table":"pcp_chess_puzzles"},{"id":386,"puzzle_hash":"658f21d73fb973e1bdbffb7727215a5cf3c9272096effdeadf2f44b6f009856e","fen":"8/8/4q3/2Bnr3/1p1Kp1n1/1P6/1Q1p4/1R1Bkb2 b - - 0 1","line_san":"1...Nf4?? 2.Qxd2+!! Kxd2 3.Bxb4#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qd5#","material_note":null,"payload":"{\"puzzle_hash\":\"658f21d73fb973e1bdbffb7727215a5cf3c9272096effdeadf2f44b6f009856e\",\"fen\":\"8/8/4q3/2Bnr3/1p1Kp1n1/1P6/1Q1p4/1R1Bkb2 b - - 0 1\",\"line_san\":\"1...Nf4?? 2.Qxd2+!! Kxd2 3.Bxb4#\",\"generator_seed\":267006332,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', 0, -1), ('K', -3, -1), ('P', -2, -3), ('Q', -1, -3), ('R', 0, -3), ('b', 0, 1), ('k', 0, 0), ('n', -4, -1), ('n', -3, 2), ('p', -3, -3), ('p', -3, 0), ('p', -1, -1), ('q', -5, 0), ('r', -4, 0))\",\"solution_key\":\"san:Nf4 Qxd2 Kxd2 Bxb4\",\"answer_key\":\"answer:Qxd2 Kxd2 Bxb4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qd5#\",\"threat_uci\":\"e6d5\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd2 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd5#\",\"THREAT_UCI: e6d5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"NOTE 2: Kxd2 forced\"]}","created_at":"2026-07-26 12:41:59","_table":"pcp_chess_puzzles"},{"id":385,"puzzle_hash":"2dfabfb07d8765c1d9558de61cb4d571f494d86e59b6bfcea80853e25b080ae5","fen":"8/5pN1/2r2kp1/2N1b3/6Kn/3R1Pn1/4Q1p1/7r b - - 0 1","line_san":"1...Nhf5?? 2.Qxe5+!! Kxe5 3.Nd7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Rh4#","material_note":"added rc6; material -4 -> 1; eval +990 -> +99993 cp","payload":"{\"puzzle_hash\":\"2dfabfb07d8765c1d9558de61cb4d571f494d86e59b6bfcea80853e25b080ae5\",\"fen\":\"8/5pN1/2r2kp1/2N1b3/6Kn/3R1Pn1/4Q1p1/7r b - - 0 1\",\"line_san\":\"1...Nhf5?? 2.Qxe5+!! Kxe5 3.Nd7#\",\"generator_seed\":953211679,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('K', -2, -1), ('N', -1, 3), ('N', 1, -1), ('P', -3, 0), ('Q', -4, 1), ('R', -3, 2), ('b', -1, 1), ('k', 0, 0), ('n', -3, -1), ('n', -2, -2), ('p', -4, -1), ('p', 0, -1), ('p', 1, 0), ('r', -5, -2), ('r', 0, 3))\",\"solution_key\":\"san:Nhf5 Qxe5 Kxe5 Nd7\",\"answer_key\":\"answer:Qxe5 Kxe5 Nd7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Rh4#\",\"threat_uci\":\"h1h4\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f5, g5 in the mate net.\",\"material_note\":\"added rc6; material -4 -> 1; eval +990 -> +99993 cp\",\"force_notes\":[\"Only Qxe5+ meets the threat cleanly; 28 quiet moves still lose immediately.\",\"Non-direct tries checked: f4.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rh4#\",\"THREAT_UCI: h1h4\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f5, g5 in the mate net.\",\"MATERIAL: added rc6; material -4 -> 1; eval +990 -> +99993 cp\",\"FORCE: Only Qxe5+ meets the threat cleanly; 28 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: f4.\",\"NOTE 2: Kxe5 forced\"]}","created_at":"2026-07-26 11:11:16","_table":"pcp_chess_puzzles"},{"id":384,"puzzle_hash":"cf42582d4ef4f18d25dc4a6f4a24edb4bb1828edcdd3fe5a018b173ce36f1fbc","fen":"3bq2r/1K1p4/1P2B3/kb3Q2/N1R5/8/8/8 b - - 0 1","line_san":"1...Bc7?? 2.Qxb5+!! Kxb5 3.Nc3+ Ka5 4.Ra4#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qb8#","material_note":null,"payload":"{\"puzzle_hash\":\"cf42582d4ef4f18d25dc4a6f4a24edb4bb1828edcdd3fe5a018b173ce36f1fbc\",\"fen\":\"3bq2r/1K1p4/1P2B3/kb3Q2/N1R5/8/8/8 b - - 0 1\",\"line_san\":\"1...Bc7?? 2.Qxb5+!! Kxb5 3.Nc3+ Ka5 4.Ra4#\",\"generator_seed\":775280093,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -1), ('K', -1, -2), ('N', 0, 1), ('P', -1, -1), ('Q', -5, 0), ('R', -2, 1), ('b', -3, -3), ('b', -1, 0), ('k', 0, 0), ('p', -3, -2), ('q', -4, -3), ('r', -7, -3))\",\"solution_key\":\"san:Bc7 Qxb5 Kxb5 Nc3 Ka5 Ra4\",\"answer_key\":\"answer:Qxb5 Kxb5 Nc3 Ka5 Ra4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qb8#\",\"threat_uci\":\"e8b8\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers a6, b6 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxb5+ meets the threat cleanly; 41 quiet moves still lose immediately.\",\"Non-direct tries checked: Qf8.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxb5 forced\"},{\"ply\":4,\"text\":\"Ka5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qb8#\",\"THREAT_UCI: e8b8\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers a6, b6 in the mate net.\",\"FORCE: Only Qxb5+ meets the threat cleanly; 41 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Qf8.\",\"NOTE 2: Kxb5 forced\",\"NOTE 4: Ka5 forced\"]}","created_at":"2026-07-26 11:08:48","_table":"pcp_chess_puzzles"},{"id":383,"puzzle_hash":"9bb141ceb39af0be6577fdbd7b5adb976e57a4ea5aba37b3fd2fde112d7177ff","fen":"8/3B4/q3n3/2p5/8/3nKP2/1pkB4/3bQ3 b - - 0 1","line_san":"1...Qd6?? 2.Qxd1+!! Kxd1 3.Ba4#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qd4#","material_note":null,"payload":"{\"puzzle_hash\":\"9bb141ceb39af0be6577fdbd7b5adb976e57a4ea5aba37b3fd2fde112d7177ff\",\"fen\":\"8/3B4/q3n3/2p5/8/3nKP2/1pkB4/3bQ3 b - - 0 1\",\"line_san\":\"1...Qd6?? 2.Qxd1+!! Kxd1 3.Ba4#\",\"generator_seed\":1716849932,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -5, -1), ('B', 0, -1), ('K', -1, -2), ('P', -1, -3), ('Q', 1, -2), ('b', 1, -1), ('k', 0, 0), ('n', -4, -2), ('n', -1, -1), ('p', -3, 0), ('p', 0, 1), ('q', -4, 2))\",\"solution_key\":\"san:Qd6 Qxd1 Kxd1 Ba4\",\"answer_key\":\"answer:Qxd1 Kxd1 Ba4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qd4#\",\"threat_uci\":\"d6d4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d2, d3 in the mate net.\",\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd4#\",\"THREAT_UCI: d6d4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d2, d3 in the mate net.\",\"NOTE 2: Kxd1 forced\"]}","created_at":"2026-07-26 10:36:32","_table":"pcp_chess_puzzles"},{"id":382,"puzzle_hash":"2c5f411c40cb559f58b10e6a8be55d05c6dade38d39579548e9823fff1235608","fen":"5R2/3p4/1r1b4/2nK2p1/3nPQ2/3k2N1/1r6/3B4 b - - 0 1","line_san":"1...Nb5?? 2.Qe3+!! Kxe3 3.Nf1+ Kd3 4.Rf3#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Nc3#","material_note":"added pg5; material -1 -> 0; eval +633 -> +912 cp","payload":"{\"puzzle_hash\":\"2c5f411c40cb559f58b10e6a8be55d05c6dade38d39579548e9823fff1235608\",\"fen\":\"5R2/3p4/1r1b4/2nK2p1/3nPQ2/3k2N1/1r6/3B4 b - - 0 1\",\"line_san\":\"1...Nb5?? 2.Qe3+!! Kxe3 3.Nf1+ Kd3 4.Rf3#\",\"generator_seed\":2055190244,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -2, 0), ('K', 2, 0), ('N', 0, -3), ('P', 1, -1), ('Q', 1, -2), ('R', 5, -2), ('b', 3, 0), ('k', 0, 0), ('n', 1, 0), ('n', 2, 1), ('p', 2, -3), ('p', 4, 0), ('r', -1, 2), ('r', 3, 2))\",\"solution_key\":\"san:Nb5 Qe3 Kxe3 Nf1 Kd3 Rf3\",\"answer_key\":\"answer:Qe3 Kxe3 Nf1 Kd3 Rf3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Nc3#\",\"threat_uci\":\"b5c3\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c4, d4, e4 in the mate net.\",\"material_note\":\"added pg5; material -1 -> 0; eval +633 -> +912 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe3 forced\"},{\"ply\":4,\"text\":\"Kd3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Nc3#\",\"THREAT_UCI: b5c3\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c4, d4, e4 in the mate net.\",\"MATERIAL: added pg5; material -1 -> 0; eval +633 -> +912 cp\",\"NOTE 2: Kxe3 forced\",\"NOTE 4: Kd3 forced\"]}","created_at":"2026-07-26 10:31:41","_table":"pcp_chess_puzzles"},{"id":381,"puzzle_hash":"92f3e1dc5e949acc722700e327dac58c1a8b1a732f2e03db560b8d727f7f0fc3","fen":"2Q5/4b3/8/6R1/P1b2p2/pkB2p1B/1p1K4/1r1nn3 b - - 0 1","line_san":"1...Nf2?? 2.Qxc4+!! Kxc4 3.Be6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Rd1#","material_note":"added be7; material -3 -> 0; eval +441 -> +99995 cp","payload":"{\"puzzle_hash\":\"92f3e1dc5e949acc722700e327dac58c1a8b1a732f2e03db560b8d727f7f0fc3\",\"fen\":\"2Q5/4b3/8/6R1/P1b2p2/pkB2p1B/1p1K4/1r1nn3 b - - 0 1\",\"line_san\":\"1...Nf2?? 2.Qxc4+!! Kxc4 3.Be6#\",\"generator_seed\":1229531591,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -6, 0), ('B', -1, 0), ('K', -2, -1), ('P', 1, 1), ('Q', -1, 5), ('R', -5, 2), ('b', -3, 4), ('b', -1, 1), ('k', 0, 0), ('n', -3, -2), ('n', -2, -2), ('p', -4, 0), ('p', -4, 1), ('p', 0, -1), ('p', 1, 0), ('r', 0, -2))\",\"solution_key\":\"san:Nf2 Qxc4 Kxc4 Be6\",\"answer_key\":\"answer:Qxc4 Kxc4 Be6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Rd1#\",\"threat_uci\":\"b1d1\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c2, c3 in the mate net.\",\"material_note\":\"added be7; material -3 -> 0; eval +441 -> +99995 cp\",\"force_notes\":[\"Only Qxc4+ wins; 42 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rd1#\",\"THREAT_UCI: b1d1\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c2, c3 in the mate net.\",\"MATERIAL: added be7; material -3 -> 0; eval +441 -> +99995 cp\",\"FORCE: Only Qxc4+ wins; 42 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: Kxc4 forced\"]}","created_at":"2026-07-26 09:34:45","_table":"pcp_chess_puzzles"},{"id":380,"puzzle_hash":"e3689c5f5ad8cc86f25b43b39c35b3fec734aa3dc47e96ffc20228362546043c","fen":"2q5/8/8/2p1p3/8/4K1N1/B3P3/r1Nkn1Q1 b - - 0 1","line_san":"1...Qg4?? 2.Qxe1+!! Kxe1 3.Nd3+ Kd1 4.Bb3#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qd4#","material_note":"added ra1; material -5 -> 0; eval -291 -> +169 cp","payload":"{\"puzzle_hash\":\"e3689c5f5ad8cc86f25b43b39c35b3fec734aa3dc47e96ffc20228362546043c\",\"fen\":\"2q5/8/8/2p1p3/8/4K1N1/B3P3/r1Nkn1Q1 b - - 0 1\",\"line_san\":\"1...Qg4?? 2.Qxe1+!! Kxe1 3.Nd3+ Kd1 4.Bb3#\",\"generator_seed\":421713052,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -1), ('K', 1, -2), ('N', -1, 0), ('N', 3, -2), ('P', 1, -1), ('Q', 3, 0), ('k', 0, 0), ('n', 1, 0), ('p', -1, -4), ('p', 1, -4), ('q', -1, -7), ('r', -3, 0))\",\"solution_key\":\"san:Qg4 Qxe1 Kxe1 Nd3 Kd1 Bb3\",\"answer_key\":\"answer:Qxe1 Kxe1 Nd3 Kd1 Bb3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qd4#\",\"threat_uci\":\"g4d4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d2, e2 in the mate net.\",\"material_note\":\"added ra1; material -5 -> 0; eval -291 -> +169 cp\",\"force_notes\":[\"Only Qxe1+ wins; 19 quiet moves allow mate in 1.\",\"1 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"If Kc2, Qd2#\"},{\"ply\":4,\"text\":\"Kd1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd4#\",\"THREAT_UCI: g4d4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d2, e2 in the mate net.\",\"MATERIAL: added ra1; material -5 -> 0; eval -291 -> +169 cp\",\"FORCE: Only Qxe1+ wins; 19 quiet moves allow mate in 1.\",\"FORCE: 1 checking tries do not solve the puzzle.\",\"NOTE 2: If Kc2, Qd2#\",\"NOTE 4: Kd1 forced\"]}","created_at":"2026-07-26 09:07:26","_table":"pcp_chess_puzzles"},{"id":379,"puzzle_hash":"e8b37e9c4b2e45257c4183dd7aed4b547ddcfa35c80f089650764cb6235874df","fen":"8/8/3B4/5pq1/8/2nKn3/pkB5/N1bQ4 b - - 0 1","line_san":"1...Qg2?? 2.Qxc1+!! Kxc1 3.Ba3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qd5#","material_note":null,"payload":"{\"puzzle_hash\":\"e8b37e9c4b2e45257c4183dd7aed4b547ddcfa35c80f089650764cb6235874df\",\"fen\":\"8/8/3B4/5pq1/8/2nKn3/pkB5/N1bQ4 b - - 0 1\",\"line_san\":\"1...Qg2?? 2.Qxc1+!! Kxc1 3.Ba3#\",\"generator_seed\":2537095569,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', 0, -1), ('K', -1, -2), ('N', 1, 1), ('Q', 1, -2), ('b', 1, -1), ('k', 0, 0), ('n', -1, -3), ('n', -1, -1), ('p', -3, -4), ('p', 0, 1), ('q', -3, -5))\",\"solution_key\":\"san:Qg2 Qxc1 Kxc1 Ba3\",\"answer_key\":\"answer:Qxc1 Kxc1 Ba3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qd5#\",\"threat_uci\":\"g2d5\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c2, c3 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxc1+ wins; 24 quiet moves allow mate in 1.\",\"1 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd5#\",\"THREAT_UCI: g2d5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c2, c3 in the mate net.\",\"FORCE: Only Qxc1+ wins; 24 quiet moves allow mate in 1.\",\"FORCE: 1 checking tries do not solve the puzzle.\",\"NOTE 2: Kxc1 forced\"]}","created_at":"2026-07-26 08:21:48","_table":"pcp_chess_puzzles"},{"id":378,"puzzle_hash":"1c1f0ce7ba09b8dfddd0cf376901c2d77709f61f7d2528dacefcb9146943488b","fen":"b7/8/1n1p1Q2/3p2R1/3K4/2Pp3N/1n1pkP2/1q2B3 b - - 0 1","line_san":"1...Qa2?? 2.Qf3+!! Kxf3 3.Ng1+ Kf4 4.Bxd2#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qc4#","material_note":"added ba8; material -3 -> 0; eval +394 -> +596 cp","payload":"{\"puzzle_hash\":\"1c1f0ce7ba09b8dfddd0cf376901c2d77709f61f7d2528dacefcb9146943488b\",\"fen\":\"b7/8/1n1p1Q2/3p2R1/3K4/2Pp3N/1n1pkP2/1q2B3 b - - 0 1\",\"line_san\":\"1...Qa2?? 2.Qf3+!! Kxf3 3.Ng1+ Kf4 4.Bxd2#\",\"generator_seed\":900181800,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -1, 0), ('K', 2, -1), ('N', 1, 3), ('P', 0, 1), ('P', 1, -2), ('Q', 4, 1), ('R', 3, 2), ('b', 6, -4), ('k', 0, 0), ('n', 0, -3), ('n', 4, -3), ('p', 0, -1), ('p', 1, -1), ('p', 3, -1), ('p', 4, -1), ('q', -1, -3))\",\"solution_key\":\"san:Qa2 Qf3 Kxf3 Ng1 Kf4 Bxd2\",\"answer_key\":\"answer:Qf3 Kxf3 Ng1 Kf4 Bxd2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qc4#\",\"threat_uci\":\"a2c4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d3, e3 in the mate net.\",\"material_note\":\"added ba8; material -3 -> 0; eval +394 -> +596 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"If Kf1, Rg1#\"},{\"ply\":4,\"text\":\"Kf4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qc4#\",\"THREAT_UCI: a2c4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d3, e3 in the mate net.\",\"MATERIAL: added ba8; material -3 -> 0; eval +394 -> +596 cp\",\"NOTE 2: If Kf1, Rg1#\",\"NOTE 4: Kf4 forced\"]}","created_at":"2026-07-26 08:18:44","_table":"pcp_chess_puzzles"},{"id":377,"puzzle_hash":"43189fecb2268791860f4f7642546e9c4f8298f7add49b544b1a825e9510b32e","fen":"b5q1/3B4/8/2p1p1n1/2p3p1/4K1pn/1pkBQP2/1N6 b - - 0 1","line_san":"1...Qf8?? 2.Qd1+!! Kxd1 3.Ba4#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qf4#","material_note":"added pc5, pg4, pg3, ba8; material -1 -> 5; eval -17 -> +251 cp","payload":"{\"puzzle_hash\":\"43189fecb2268791860f4f7642546e9c4f8298f7add49b544b1a825e9510b32e\",\"fen\":\"b5q1/3B4/8/2p1p1n1/2p3p1/4K1pn/1pkBQP2/1N6 b - - 0 1\",\"line_san\":\"1...Qf8?? 2.Qd1+!! Kxd1 3.Ba4#\",\"generator_seed\":304119503,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -5, -1), ('B', 0, -1), ('K', -1, -2), ('N', 1, 1), ('P', 0, -3), ('Q', 0, -2), ('b', -6, 2), ('k', 0, 0), ('n', -3, -4), ('n', -1, -5), ('p', -3, -2), ('p', -3, 0), ('p', -2, -4), ('p', -2, 0), ('p', -1, -4), ('p', 0, 1), ('q', -6, -4))\",\"solution_key\":\"san:Qf8 Qd1 Kxd1 Ba4\",\"answer_key\":\"answer:Qd1 Kxd1 Ba4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qf4#\",\"threat_uci\":\"f8f4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d2, d3 in the mate net.\",\"material_note\":\"added pc5, pg4, pg3, ba8; material -1 -> 5; eval -17 -> +251 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qf4#\",\"THREAT_UCI: f8f4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d2, d3 in the mate net.\",\"MATERIAL: added pc5, pg4, pg3, ba8; material -1 -> 5; eval -17 -> +251 cp\",\"NOTE 2: Kxd1 forced\"]}","created_at":"2026-07-25 21:59:33","_table":"pcp_chess_puzzles"},{"id":376,"puzzle_hash":"8725d9aa1313986fa234863870b2d634737ec86149710de6ba13c826c0283049","fen":"8/1R6/1Q4bk/2b1P3/5nK1/5B2/8/2q3n1 b - - 0 1","line_san":"1...Nfe2?? 2.Qxg6+!! Kxg6 3.Be4+ Kh6 4.Rh7#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qg5#","material_note":null,"payload":"{\"puzzle_hash\":\"8725d9aa1313986fa234863870b2d634737ec86149710de6ba13c826c0283049\",\"fen\":\"8/1R6/1Q4bk/2b1P3/5nK1/5B2/8/2q3n1 b - - 0 1\",\"line_san\":\"1...Nfe2?? 2.Qxg6+!! Kxg6 3.Be4+ Kh6 4.Rh7#\",\"generator_seed\":604730192,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('K', -2, -1), ('P', -1, -3), ('Q', 0, -6), ('R', 1, -6), ('b', -1, -5), ('b', 0, -1), ('k', 0, 0), ('n', -5, -1), ('n', -2, -2), ('q', -5, -5))\",\"solution_key\":\"san:Nfe2 Qxg6 Kxg6 Be4 Kh6 Rh7\",\"answer_key\":\"answer:Qxg6 Kxg6 Be4 Kh6 Rh7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qg5#\",\"threat_uci\":\"c1g5\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers g5, h5 in the mate net.\",\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg6 forced\"},{\"ply\":4,\"text\":\"Kh6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qg5#\",\"THREAT_UCI: c1g5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers g5, h5 in the mate net.\",\"NOTE 2: Kxg6 forced\",\"NOTE 4: Kh6 forced\"]}","created_at":"2026-07-25 21:50:07","_table":"pcp_chess_puzzles"},{"id":375,"puzzle_hash":"b4f3c29343051d6b8c6e31a2a90781ec8c7c39d6d29b0415112ce74bd3444342","fen":"8/1r6/1q1rn3/3nK1Pk/3p2bB/3B2Q1/7R/8 b - - 0 1","line_san":"1...Re7?? 2.Qxg4+!! Kxg4 3.Be2#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Nef4#","material_note":null,"payload":"{\"puzzle_hash\":\"b4f3c29343051d6b8c6e31a2a90781ec8c7c39d6d29b0415112ce74bd3444342\",\"fen\":\"8/1r6/1q1rn3/3nK1Pk/3p2bB/3B2Q1/7R/8 b - - 0 1\",\"line_san\":\"1...Re7?? 2.Qxg4+!! Kxg4 3.Be2#\",\"generator_seed\":3028100158,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', 0, -1), ('K', -3, 0), ('P', -1, 0), ('Q', -1, -2), ('R', 0, -3), ('b', -1, -1), ('k', 0, 0), ('n', -4, 0), ('n', -3, 1), ('p', -4, -1), ('q', -6, 1), ('r', -6, 2), ('r', -4, 1))\",\"solution_key\":\"san:Re7 Qxg4 Kxg4 Be2\",\"answer_key\":\"answer:Qxg4 Kxg4 Be2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Nef4#\",\"threat_uci\":\"e6f4\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":null,\"force_notes\":[\"Only Qxg4+ meets the threat cleanly; 28 quiet moves still lose immediately.\",\"Non-direct tries checked: Bf5.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Nef4#\",\"THREAT_UCI: e6f4\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"FORCE: Only Qxg4+ meets the threat cleanly; 28 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Bf5.\",\"NOTE 2: Kxg4 forced\"]}","created_at":"2026-07-25 20:24:04","_table":"pcp_chess_puzzles"},{"id":374,"puzzle_hash":"86bff5f3b821266e20460b7e8e39690477c22d839d0868cfdbdf6626f9daff70","fen":"Q1B5/5prq/1P3Kn1/3r2n1/4kp2/1N2p3/8/2R5 b - - 0 1","line_san":"1...Qh8?? 2.Qxd5+!! Kxd5 3.Bb7+ Kd6 4.Rd1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rg8#","material_note":null,"payload":"{\"puzzle_hash\":\"86bff5f3b821266e20460b7e8e39690477c22d839d0868cfdbdf6626f9daff70\",\"fen\":\"Q1B5/5prq/1P3Kn1/3r2n1/4kp2/1N2p3/8/2R5 b - - 0 1\",\"line_san\":\"1...Qh8?? 2.Qxd5+!! Kxd5 3.Bb7+ Kd6 4.Rd1#\",\"generator_seed\":836365014,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -2), ('K', -2, 1), ('N', 1, -3), ('P', -2, -3), ('Q', -4, -4), ('R', 3, -2), ('k', 0, 0), ('n', -2, 2), ('n', -1, 2), ('p', -3, 1), ('p', 0, 1), ('p', 1, 0), ('q', -3, 3), ('r', -3, 2), ('r', -1, -1))\",\"solution_key\":\"san:Qh8 Qxd5 Kxd5 Bb7 Kd6 Rd1\",\"answer_key\":\"answer:Qxd5 Kxd5 Bb7 Kd6 Rd1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rg8#\",\"threat_uci\":\"g7g8\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e5, f5 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxd5+ wins; 31 quiet moves allow mate in 1.\",\"5 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd5 forced\"},{\"ply\":4,\"text\":\"Kd6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rg8#\",\"THREAT_UCI: g7g8\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e5, f5 in the mate net.\",\"FORCE: Only Qxd5+ wins; 31 quiet moves allow mate in 1.\",\"FORCE: 5 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd5 forced\",\"NOTE 4: Kd6 forced\"]}","created_at":"2026-07-25 19:15:43","_table":"pcp_chess_puzzles"},{"id":373,"puzzle_hash":"362f39f8793484698ac1570e6964505be149107f58595d56b00442ef1a4a5d15","fen":"7q/8/3n4/3R1p1n/8/3P1K1p/2pkB3/B3bQ2 b - - 0 1","line_san":"1...Qg8?? 2.Qxe1+!! Kxe1 3.Bc3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qg4#","material_note":"added ph3; material -1 -> 0; eval +465 -> +581 cp","payload":"{\"puzzle_hash\":\"362f39f8793484698ac1570e6964505be149107f58595d56b00442ef1a4a5d15\",\"fen\":\"7q/8/3n4/3R1p1n/8/3P1K1p/2pkB3/B3bQ2 b - - 0 1\",\"line_san\":\"1...Qg8?? 2.Qxe1+!! Kxe1 3.Bc3#\",\"generator_seed\":3302228494,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, -1), ('B', 1, 0), ('K', 2, 1), ('P', 0, 1), ('Q', 2, -1), ('R', 0, 3), ('b', 1, -1), ('k', 0, 0), ('n', 0, 4), ('n', 4, 3), ('p', -1, 0), ('p', 2, 3), ('p', 4, 1), ('q', 4, 6))\",\"solution_key\":\"san:Qg8 Qxe1 Kxe1 Bc3\",\"answer_key\":\"answer:Qxe1 Kxe1 Bc3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qg4#\",\"threat_uci\":\"g8g4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e2, e3 in the mate net.\",\"material_note\":\"added ph3; material -1 -> 0; eval +465 -> +581 cp\",\"force_notes\":[\"Only Qxe1+ wins; 20 quiet moves allow mate in 1.\",\"1 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qg4#\",\"THREAT_UCI: g8g4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e2, e3 in the mate net.\",\"MATERIAL: added ph3; material -1 -> 0; eval +465 -> +581 cp\",\"FORCE: Only Qxe1+ wins; 20 quiet moves allow mate in 1.\",\"FORCE: 1 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe1 forced\"]}","created_at":"2026-07-25 18:54:28","_table":"pcp_chess_puzzles"},{"id":372,"puzzle_hash":"420621673cd8cd9e8b72e7ef0e5d663704a36d14c4dfca68b5fc219054e4e07c","fen":"2n5/p7/N2R4/kb1Q4/3P4/PK2n3/1bB5/6q1 b - - 0 1","line_san":"1...Qa1?? 2.Qxb5+!! Kxb5 3.Nc7+ Ka5 4.Ra6#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qxa3#","material_note":"added nc8, pa7; material -4 -> 0; eval +344 -> +554 cp","payload":"{\"puzzle_hash\":\"420621673cd8cd9e8b72e7ef0e5d663704a36d14c4dfca68b5fc219054e4e07c\",\"fen\":\"2n5/p7/N2R4/kb1Q4/3P4/PK2n3/1bB5/6q1 b - - 0 1\",\"line_san\":\"1...Qa1?? 2.Qxb5+!! Kxb5 3.Nc7+ Ka5 4.Ra6#\",\"generator_seed\":2637276071,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('K', -2, -1), ('N', 1, 0), ('P', -2, 0), ('P', -1, -3), ('Q', 0, -3), ('R', 1, -3), ('b', -3, -1), ('b', 0, -1), ('k', 0, 0), ('n', -2, -4), ('n', 3, -2), ('p', 2, 0), ('q', -4, -6))\",\"solution_key\":\"san:Qa1 Qxb5 Kxb5 Nc7 Ka5 Ra6\",\"answer_key\":\"answer:Qxb5 Kxb5 Nc7 Ka5 Ra6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qxa3#\",\"threat_uci\":\"a1a3\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers a4, b4 in the mate net.\",\"material_note\":\"added nc8, pa7; material -4 -> 0; eval +344 -> +554 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxb5 forced\"},{\"ply\":4,\"text\":\"Ka5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxa3#\",\"THREAT_UCI: a1a3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers a4, b4 in the mate net.\",\"MATERIAL: added nc8, pa7; material -4 -> 0; eval +344 -> +554 cp\",\"NOTE 2: Kxb5 forced\",\"NOTE 4: Ka5 forced\"]}","created_at":"2026-07-25 18:53:48","_table":"pcp_chess_puzzles"},{"id":371,"puzzle_hash":"cfd5b979fcbc2e70e21542284391758ad22f5201ae5e4ffb6760cc1b28d89136","fen":"r2r1q2/3p1n2/1Q1p4/Pn1K4/1k2B1R1/pNb5/8/8 b - - 0 1","line_san":"1...Re8?? 2.Qxb5+!! Kxb5 3.Bd3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Re5#","material_note":"added ra8, nf7, qf8; material -7 -> 10; eval -828 -> +220 cp","payload":"{\"puzzle_hash\":\"cfd5b979fcbc2e70e21542284391758ad22f5201ae5e4ffb6760cc1b28d89136\",\"fen\":\"r2r1q2/3p1n2/1Q1p4/Pn1K4/1k2B1R1/pNb5/8/8 b - - 0 1\",\"line_san\":\"1...Re8?? 2.Qxb5+!! Kxb5 3.Bd3#\",\"generator_seed\":482611962,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, 0), ('K', -2, -1), ('N', 0, 1), ('P', 1, -1), ('Q', 0, -2), ('R', -5, 0), ('b', -1, 1), ('k', 0, 0), ('n', -4, -3), ('n', 0, -1), ('p', -2, -3), ('p', -2, -2), ('p', 1, 1), ('q', -4, -4), ('r', -2, -4), ('r', 1, -4))\",\"solution_key\":\"san:Re8 Qxb5 Kxb5 Bd3\",\"answer_key\":\"answer:Qxb5 Kxb5 Bd3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Re5#\",\"threat_uci\":\"e8e5\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c4, c5 in the mate net.\",\"material_note\":\"added ra8, nf7, qf8; material -7 -> 10; eval -828 -> +220 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxb5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Re5#\",\"THREAT_UCI: e8e5\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c4, c5 in the mate net.\",\"MATERIAL: added ra8, nf7, qf8; material -7 -> 10; eval -828 -> +220 cp\",\"NOTE 2: Kxb5 forced\"]}","created_at":"2026-07-25 18:02:39","_table":"pcp_chess_puzzles"},{"id":370,"puzzle_hash":"9ed8d4a06b9ef48d5592fb4a6806571ef807d5c3d331fb90a82d645bc8d6a93c","fen":"3Q2R1/1P1p1p1r/1B1k1Kp1/4p1p1/5b1n/q2n3p/b5r1/8 b - - 0 1","line_san":"1...Be3?? 2.Qxd7+!! Kxd7 3.b8=N+ Kd6 4.Rd8#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rf2#","material_note":"added qa3, nd3, nh4, ph3, ba2; material 0 -> 19; eval -1505 -> +784 cp","payload":"{\"puzzle_hash\":\"9ed8d4a06b9ef48d5592fb4a6806571ef807d5c3d331fb90a82d645bc8d6a93c\",\"fen\":\"3Q2R1/1P1p1p1r/1B1k1Kp1/4p1p1/5b1n/q2n3p/b5r1/8 b - - 0 1\",\"line_san\":\"1...Be3?? 2.Qxd7+!! Kxd7 3.b8=N+ Kd6 4.Rd8#\",\"generator_seed\":1219741673,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -2, 0), ('K', 2, 0), ('P', -2, -1), ('Q', 0, -2), ('R', 3, -2), ('b', -3, 4), ('b', 2, 2), ('k', 0, 0), ('n', 0, 3), ('n', 4, 2), ('p', 0, -1), ('p', 1, 1), ('p', 2, -1), ('p', 3, 0), ('p', 3, 1), ('p', 4, 3), ('q', -3, 3), ('r', 3, 4), ('r', 4, -1))\",\"solution_key\":\"san:Be3 Qxd7 Kxd7 b8=N Kd6 Rd8\",\"answer_key\":\"answer:Qxd7 Kxd7 b8=N Kd6 Rd8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rf2#\",\"threat_uci\":\"g2f2\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e5, e6, e7 in the mate net.\",\"material_note\":\"added qa3, nd3, nh4, ph3, ba2; material 0 -> 19; eval -1505 -> +784 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd7 forced\"},{\"ply\":4,\"text\":\"Kd6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rf2#\",\"THREAT_UCI: g2f2\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e5, e6, e7 in the mate net.\",\"MATERIAL: added qa3, nd3, nh4, ph3, ba2; material 0 -> 19; eval -1505 -> +784 cp\",\"NOTE 2: Kxd7 forced\",\"NOTE 4: Kd6 forced\"]}","created_at":"2026-07-25 17:57:04","_table":"pcp_chess_puzzles"},{"id":369,"puzzle_hash":"da879afc5d252ae5d8c2ab15e8e1555a03f4275220d7f47244d121c9abf8d77e","fen":"7Q/8/8/2n2KPb/1R2B2k/3n2b1/2q1p3/8 b - - 0 1","line_san":"1...Qc1?? 2.Qxh5+!! Kxh5 3.Bf3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qf4#","material_note":null,"payload":"{\"puzzle_hash\":\"da879afc5d252ae5d8c2ab15e8e1555a03f4275220d7f47244d121c9abf8d77e\",\"fen\":\"7Q/8/8/2n2KPb/1R2B2k/3n2b1/2q1p3/8 b - - 0 1\",\"line_san\":\"1...Qc1?? 2.Qxh5+!! Kxh5 3.Bf3#\",\"generator_seed\":3574436772,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, 0), ('K', -2, -1), ('P', -1, -1), ('Q', 0, -4), ('R', -6, 0), ('b', -1, 1), ('b', 0, -1), ('k', 0, 0), ('n', -5, -1), ('n', -4, 1), ('p', -3, 2), ('q', -5, 2))\",\"solution_key\":\"san:Qc1 Qxh5 Kxh5 Bf3\",\"answer_key\":\"answer:Qxh5 Kxh5 Bf3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qf4#\",\"threat_uci\":\"c1f4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers g4, g5 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxh5+ wins; 28 quiet moves allow mate in 1.\",\"8 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxh5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qf4#\",\"THREAT_UCI: c1f4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers g4, g5 in the mate net.\",\"FORCE: Only Qxh5+ wins; 28 quiet moves allow mate in 1.\",\"FORCE: 8 checking tries do not solve the puzzle.\",\"NOTE 2: Kxh5 forced\"]}","created_at":"2026-07-25 11:57:02","_table":"pcp_chess_puzzles"},{"id":368,"puzzle_hash":"2446ca14e5cfbc658b7874f3568bc01bf12a480e94b6d18e9e454167b55bd003","fen":"7Q/r7/5n2/4r3/5pR1/4pK2/5PBb/6k1 b - - 0 1","line_san":"1...Ra2?? 2.Qxh2+!! Kxh2 3.Rh4+ Kg1 4.Rh1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rxf2#","material_note":null,"payload":"{\"puzzle_hash\":\"2446ca14e5cfbc658b7874f3568bc01bf12a480e94b6d18e9e454167b55bd003\",\"fen\":\"7Q/r7/5n2/4r3/5pR1/4pK2/5PBb/6k1 b - - 0 1\",\"line_san\":\"1...Ra2?? 2.Qxh2+!! Kxh2 3.Rh4+ Kg1 4.Rh1#\",\"generator_seed\":3362296814,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -1, 0), ('K', -2, -1), ('P', -1, -1), ('Q', -7, 1), ('R', -3, 0), ('b', -1, 1), ('k', 0, 0), ('n', -5, -1), ('p', -3, -1), ('p', -2, -2), ('r', -6, -6), ('r', -4, -2))\",\"solution_key\":\"san:Ra2 Qxh2 Kxh2 Rh4 Kg1 Rh1\",\"answer_key\":\"answer:Qxh2 Kxh2 Rh4 Kg1 Rh1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rxf2#\",\"threat_uci\":\"a2f2\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f2, g2 in the mate net.\",\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxh2 forced\"},{\"ply\":4,\"text\":\"Kg1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rxf2#\",\"THREAT_UCI: a2f2\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f2, g2 in the mate net.\",\"NOTE 2: Kxh2 forced\",\"NOTE 4: Kg1 forced\"]}","created_at":"2026-07-25 11:50:05","_table":"pcp_chess_puzzles"},{"id":367,"puzzle_hash":"77e1924f57f02a6cf9d6144583a6dcf3bd9e9e97da36daf93866ce838527df10","fen":"4r3/8/3n1q2/4kp2/1N1b1n2/1B3K2/4P1P1/2RQ4 b - - 0 1","line_san":"1...Qg5?? 2.Qxd4+!! Kxd4 3.Nc6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxg2#","material_note":"added re8; material -3 -> 2; eval -330 -> +360 cp","payload":"{\"puzzle_hash\":\"77e1924f57f02a6cf9d6144583a6dcf3bd9e9e97da36daf93866ce838527df10\",\"fen\":\"4r3/8/3n1q2/4kp2/1N1b1n2/1B3K2/4P1P1/2RQ4 b - - 0 1\",\"line_san\":\"1...Qg5?? 2.Qxd4+!! Kxd4 3.Nc6#\",\"generator_seed\":217074599,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, -2), ('K', 1, -2), ('N', -3, -1), ('P', 0, -3), ('P', 2, -3), ('Q', -1, -4), ('R', -2, -4), ('b', -1, -1), ('k', 0, 0), ('n', -1, 1), ('n', 1, -1), ('p', 1, 0), ('q', 1, 1), ('r', 0, 3))\",\"solution_key\":\"san:Qg5 Qxd4 Kxd4 Nc6\",\"answer_key\":\"answer:Qxd4 Kxd4 Nc6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxg2#\",\"threat_uci\":\"g5g2\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers e4, f4 in the mate net.\",\"material_note\":\"added re8; material -3 -> 2; eval -330 -> +360 cp\",\"force_notes\":[\"Only Qxd4+ wins; 31 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxg2#\",\"THREAT_UCI: g5g2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers e4, f4 in the mate net.\",\"MATERIAL: added re8; material -3 -> 2; eval -330 -> +360 cp\",\"FORCE: Only Qxd4+ wins; 31 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd4 forced\"]}","created_at":"2026-07-25 11:14:44","_table":"pcp_chess_puzzles"},{"id":366,"puzzle_hash":"1643a100d67de931b934eb63018af3b6a732db6a0dc2e0fa98f820d5262aaa58","fen":"3Q2b1/4R1Bk/3p1K2/2br1p2/3n1r2/5n2/2q5/8 b - - 0 1","line_san":"1...Qf2?? 2.Qxg8+!! Kxg8 3.Re8+ Kh7 4.Rh8#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qh4#","material_note":"added rf4; material 11 -> 16; eval -99994 -> +839 cp","payload":"{\"puzzle_hash\":\"1643a100d67de931b934eb63018af3b6a732db6a0dc2e0fa98f820d5262aaa58\",\"fen\":\"3Q2b1/4R1Bk/3p1K2/2br1p2/3n1r2/5n2/2q5/8 b - - 0 1\",\"line_san\":\"1...Qf2?? 2.Qxg8+!! Kxg8 3.Re8+ Kh7 4.Rh8#\",\"generator_seed\":2787808328,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -1, 0), ('K', -2, -1), ('Q', -4, 1), ('R', -3, 0), ('b', -5, -2), ('b', -1, 1), ('k', 0, 0), ('n', -4, -3), ('n', -2, -4), ('p', -4, -1), ('p', -2, -2), ('q', -5, -5), ('r', -4, -2), ('r', -2, -3))\",\"solution_key\":\"san:Qf2 Qxg8 Kxg8 Re8 Kh7 Rh8\",\"answer_key\":\"answer:Qxg8 Kxg8 Re8 Kh7 Rh8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qh4#\",\"threat_uci\":\"f2h4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers g6, g7 in the mate net.\",\"material_note\":\"added rf4; material 11 -> 16; eval -99994 -> +839 cp\",\"force_notes\":[\"Only Qxg8+ wins; 22 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg8 forced\"},{\"ply\":4,\"text\":\"Kh7 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qh4#\",\"THREAT_UCI: f2h4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers g6, g7 in the mate net.\",\"MATERIAL: added rf4; material 11 -> 16; eval -99994 -> +839 cp\",\"FORCE: Only Qxg8+ wins; 22 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: Kxg8 forced\",\"NOTE 4: Kh7 forced\"]}","created_at":"2026-07-25 11:09:36","_table":"pcp_chess_puzzles"},{"id":365,"puzzle_hash":"af1e02ef9b64cc497b8c6644bbf41aac6d50112171a994c384b63e4a5a657369","fen":"8/4n2r/3BKn1k/3P2bB/4p3/4P1Q1/7R/1q6 b - - 0 1","line_san":"1...Qb7?? 2.Qxg5+!! Kxg5 3.Bf4#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxd5#","material_note":null,"payload":"{\"puzzle_hash\":\"af1e02ef9b64cc497b8c6644bbf41aac6d50112171a994c384b63e4a5a657369\",\"fen\":\"8/4n2r/3BKn1k/3P2bB/4p3/4P1Q1/7R/1q6 b - - 0 1\",\"line_san\":\"1...Qb7?? 2.Qxg5+!! Kxg5 3.Bf4#\",\"generator_seed\":2429861944,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, 0), ('B', 0, -1), ('K', -3, 0), ('P', -4, -1), ('P', -3, -3), ('Q', -1, -3), ('R', 0, -4), ('b', -1, -1), ('k', 0, 0), ('n', -3, 1), ('n', -2, 0), ('p', -3, -2), ('q', -6, -5), ('r', 0, 1))\",\"solution_key\":\"san:Qb7 Qxg5 Kxg5 Bf4\",\"answer_key\":\"answer:Qxg5 Kxg5 Bf4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxd5#\",\"threat_uci\":\"b7d5\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":null,\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxd5#\",\"THREAT_UCI: b7d5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"NOTE 2: Kxg5 forced\"]}","created_at":"2026-07-25 08:28:39","_table":"pcp_chess_puzzles"},{"id":364,"puzzle_hash":"0b0767ef6e9b2b225dc25714690752862cae7752ff9197009b9542aba860763a","fen":"1b6/qp6/8/n1nK4/5k2/4rN2/1BR3P1/2Q5 b - - 0 1","line_san":"1...Qb6?? 2.Qxe3+!! Kxe3 3.Bc1+ Kd3 4.Ne1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qd6#","material_note":null,"payload":"{\"puzzle_hash\":\"0b0767ef6e9b2b225dc25714690752862cae7752ff9197009b9542aba860763a\",\"fen\":\"1b6/qp6/8/n1nK4/5k2/4rN2/1BR3P1/2Q5 b - - 0 1\",\"line_san\":\"1...Qb6?? 2.Qxe3+!! Kxe3 3.Bc1+ Kd3 4.Ne1#\",\"generator_seed\":3164367344,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -2), ('K', -2, 1), ('N', 0, -1), ('P', 1, -2), ('Q', -3, -3), ('R', -3, -2), ('b', -4, 4), ('k', 0, 0), ('n', -5, 1), ('n', -3, 1), ('p', -4, 3), ('q', -5, 3), ('r', -1, -1))\",\"solution_key\":\"san:Qb6 Qxe3 Kxe3 Bc1 Kd3 Ne1\",\"answer_key\":\"answer:Qxe3 Kxe3 Bc1 Kd3 Ne1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qd6#\",\"threat_uci\":\"b6d6\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e4, e5 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxe3+ wins; 30 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"If Kf5, Qg5#\"},{\"ply\":4,\"text\":\"Kd3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd6#\",\"THREAT_UCI: b6d6\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e4, e5 in the mate net.\",\"FORCE: Only Qxe3+ wins; 30 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: If Kf5, Qg5#\",\"NOTE 4: Kd3 forced\"]}","created_at":"2026-07-25 07:55:41","_table":"pcp_chess_puzzles"},{"id":363,"puzzle_hash":"6e78022b6407560748d772977f013d1fe5ff87e2359431ddbefa32967e4c02d5","fen":"6Q1/4R3/1n2K1b1/B1bP1Nk1/5pP1/4n3/8/2q5 b - - 0 1","line_san":"1...Qc4?? 2.Qxg6+!! Kxg6 3.Rg7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxd5#","material_note":null,"payload":"{\"puzzle_hash\":\"6e78022b6407560748d772977f013d1fe5ff87e2359431ddbefa32967e4c02d5\",\"fen\":\"6Q1/4R3/1n2K1b1/B1bP1Nk1/5pP1/4n3/8/2q5 b - - 0 1\",\"line_san\":\"1...Qc4?? 2.Qxg6+!! Kxg6 3.Rg7#\",\"generator_seed\":2956409780,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -6, 0), ('K', -2, -1), ('N', -1, 0), ('P', -3, 0), ('P', 0, 1), ('Q', 0, -3), ('R', -2, -2), ('b', -4, 0), ('b', 0, -1), ('k', 0, 0), ('n', -5, -1), ('n', -2, 2), ('p', -1, 1), ('q', -4, 4))\",\"solution_key\":\"san:Qc4 Qxg6 Kxg6 Rg7\",\"answer_key\":\"answer:Qxg6 Kxg6 Rg7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxd5#\",\"threat_uci\":\"c4d5\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers f5, f6 in the mate net.\",\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxd5#\",\"THREAT_UCI: c4d5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers f5, f6 in the mate net.\",\"NOTE 2: Kxg6 forced\"]}","created_at":"2026-07-25 06:45:19","_table":"pcp_chess_puzzles"},{"id":362,"puzzle_hash":"426fcef72b950f3246b93ab34bf7b5c223e4e8d4eef51baae82c4e95559833cf","fen":"2BQ4/2R5/5p1r/8/1B3Kn1/3b1n2/4kp2/6r1 b - - 0 1","line_san":"1...Nh4?? 2.Qxd3+!! Kxd3 3.Ba6+ Kd4 4.Rd7#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Ng6#","material_note":"added rh6; material -4 -> 1; eval +434 -> +895 cp","payload":"{\"puzzle_hash\":\"426fcef72b950f3246b93ab34bf7b5c223e4e8d4eef51baae82c4e95559833cf\",\"fen\":\"2BQ4/2R5/5p1r/8/1B3Kn1/3b1n2/4kp2/6r1 b - - 0 1\",\"line_san\":\"1...Nh4?? 2.Qxd3+!! Kxd3 3.Ba6+ Kd4 4.Rd7#\",\"generator_seed\":440058703,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -6, -2), ('B', -2, -3), ('K', -2, 1), ('Q', -6, -1), ('R', -5, -2), ('b', -1, -1), ('k', 0, 0), ('n', -2, 2), ('n', -1, 1), ('p', -4, 1), ('p', 0, 1), ('r', -4, 3), ('r', 1, 2))\",\"solution_key\":\"san:Nh4 Qxd3 Kxd3 Ba6 Kd4 Rd7\",\"answer_key\":\"answer:Qxd3 Kxd3 Ba6 Kd4 Rd7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Ng6#\",\"threat_uci\":\"h4g6\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e3, f3 in the mate net.\",\"material_note\":\"added rh6; material -4 -> 1; eval +434 -> +895 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd3 forced\"},{\"ply\":4,\"text\":\"Kd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ng6#\",\"THREAT_UCI: h4g6\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e3, f3 in the mate net.\",\"MATERIAL: added rh6; material -4 -> 1; eval +434 -> +895 cp\",\"NOTE 2: Kxd3 forced\",\"NOTE 4: Kd4 forced\"]}","created_at":"2026-07-25 06:34:05","_table":"pcp_chess_puzzles"},{"id":361,"puzzle_hash":"7fb89bfadec65ec1870d24e095c9c911c708ca52f4b8cc663c91076a293e2d5b","fen":"6N1/2p5/2Pkp2Q/r2p1RB1/2nK4/5b2/1rp2n2/8 b - - 0 1","line_san":"1...Rb3?? 2.Qxe6+!! Kxe6 3.Rf6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Rd3#","material_note":"added ra5; material -3 -> 2; eval -174 -> +194 cp","payload":"{\"puzzle_hash\":\"7fb89bfadec65ec1870d24e095c9c911c708ca52f4b8cc663c91076a293e2d5b\",\"fen\":\"6N1/2p5/2Pkp2Q/r2p1RB1/2nK4/5b2/1rp2n2/8 b - - 0 1\",\"line_san\":\"1...Rb3?? 2.Qxe6+!! Kxe6 3.Rf6#\",\"generator_seed\":3851896551,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, -1), ('K', 0, -2), ('N', -3, 2), ('P', 1, 0), ('Q', -4, 0), ('R', -2, -1), ('b', -2, -3), ('k', 0, 0), ('n', -2, -4), ('n', 1, -2), ('p', -1, 0), ('p', 0, -1), ('p', 1, -4), ('p', 1, 1), ('r', 2, -4), ('r', 3, -1))\",\"solution_key\":\"san:Rb3 Qxe6 Kxe6 Rf6\",\"answer_key\":\"answer:Qxe6 Kxe6 Rf6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Rd3#\",\"threat_uci\":\"b3d3\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c5, d5, e5 in the mate net.\",\"material_note\":\"added ra5; material -3 -> 2; eval -174 -> +194 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rd3#\",\"THREAT_UCI: b3d3\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c5, d5, e5 in the mate net.\",\"MATERIAL: added ra5; material -3 -> 2; eval -174 -> +194 cp\",\"NOTE 2: Kxe6 forced\"]}","created_at":"2026-07-25 04:21:25","_table":"pcp_chess_puzzles"},{"id":360,"puzzle_hash":"1835bc747661eaa7157ee7e135e7ddfa19f21a1ddf1bfabf8ec09c69b0883c1f","fen":"3RQ3/5B2/3N2p1/1n4P1/3k1pK1/q2r2b1/8/5r2 b - - 0 1","line_san":"1...Rh1?? 2.Qe5+!! Kxe5 3.Nc4+ Ke4 4.Bxg6#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rh4#","material_note":"added qa3, nb5; material -6 -> 6; eval -785 -> +310 cp","payload":"{\"puzzle_hash\":\"1835bc747661eaa7157ee7e135e7ddfa19f21a1ddf1bfabf8ec09c69b0883c1f\",\"fen\":\"3RQ3/5B2/3N2p1/1n4P1/3k1pK1/q2r2b1/8/5r2 b - - 0 1\",\"line_san\":\"1...Rh1?? 2.Qe5+!! Kxe5 3.Nc4+ Ke4 4.Bxg6#\",\"generator_seed\":1322680717,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('K', 0, -3), ('N', -2, 0), ('P', -1, -3), ('Q', -4, -1), ('R', -4, 0), ('b', 1, -3), ('k', 0, 0), ('n', -1, 2), ('p', -2, -3), ('p', 0, -2), ('q', 1, 3), ('r', 1, 0), ('r', 3, -2))\",\"solution_key\":\"san:Rh1 Qe5 Kxe5 Nc4 Ke4 Bxg6\",\"answer_key\":\"answer:Qe5 Kxe5 Nc4 Ke4 Bxg6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rh4#\",\"threat_uci\":\"h1h4\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added qa3, nb5; material -6 -> 6; eval -785 -> +310 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe5 forced\"},{\"ply\":4,\"text\":\"Ke4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rh4#\",\"THREAT_UCI: h1h4\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added qa3, nb5; material -6 -> 6; eval -785 -> +310 cp\",\"NOTE 2: Kxe5 forced\",\"NOTE 4: Ke4 forced\"]}","created_at":"2026-07-25 04:16:37","_table":"pcp_chess_puzzles"},{"id":359,"puzzle_hash":"761aa652c033eb400d15dac5568813b9483e0eeb797ea6acb2195bcd12ef2a14","fen":"r3B3/PnP5/1K6/PN1b2Q1/1pkP1R2/1q1p4/8/2r5 b - - 0 1","line_san":"1...Qa4?? 2.Qxd5+!! Kxd5 3.Bf7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxa5#","material_note":"added rc1; material -2 -> 3; eval -487 -> +181 cp","payload":"{\"puzzle_hash\":\"761aa652c033eb400d15dac5568813b9483e0eeb797ea6acb2195bcd12ef2a14\",\"fen\":\"r3B3/PnP5/1K6/PN1b2Q1/1pkP1R2/1q1p4/8/2r5 b - - 0 1\",\"line_san\":\"1...Qa4?? 2.Qxd5+!! Kxd5 3.Bf7#\",\"generator_seed\":426996276,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('K', -2, 1), ('N', -1, 1), ('P', -3, 0), ('P', -3, 2), ('P', -1, 2), ('P', 0, -1), ('Q', -1, -4), ('R', 0, -3), ('b', -1, -1), ('k', 0, 0), ('n', -3, 1), ('p', 0, 1), ('p', 1, -1), ('q', 1, 1), ('r', -4, 2), ('r', 3, 0))\",\"solution_key\":\"san:Qa4 Qxd5 Kxd5 Bf7\",\"answer_key\":\"answer:Qxd5 Kxd5 Bf7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxa5#\",\"threat_uci\":\"a4a5\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers b5, c5 in the mate net.\",\"material_note\":\"added rc1; material -2 -> 3; eval -487 -> +181 cp\",\"force_notes\":[\"Only Qxd5+ meets the threat cleanly; 34 quiet moves still lose immediately.\",\"Non-direct tries checked: Bc6.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxa5#\",\"THREAT_UCI: a4a5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers b5, c5 in the mate net.\",\"MATERIAL: added rc1; material -2 -> 3; eval -487 -> +181 cp\",\"FORCE: Only Qxd5+ meets the threat cleanly; 34 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Bc6.\",\"NOTE 2: Kxd5 forced\"]}","created_at":"2026-07-25 03:24:28","_table":"pcp_chess_puzzles"},{"id":358,"puzzle_hash":"5cc064d96ad1be8490ad3dfc0a424f31fed56d4fc577cf31e98c9c35ff2f0008","fen":"4B3/5Q2/5R2/2Br2p1/qPk1n2b/2p1K1p1/8/8 b - - 0 1","line_san":"1...Qc2?? 2.Qxd5+!! Kxd5 3.Bf7+ Ke5 4.Bd4#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qd3#","material_note":null,"payload":"{\"puzzle_hash\":\"5cc064d96ad1be8490ad3dfc0a424f31fed56d4fc577cf31e98c9c35ff2f0008\",\"fen\":\"4B3/5Q2/5R2/2Br2p1/qPk1n2b/2p1K1p1/8/8 b - - 0 1\",\"line_san\":\"1...Qc2?? 2.Qxd5+!! Kxd5 3.Bf7+ Ke5 4.Bd4#\",\"generator_seed\":605782838,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -2), ('B', -1, 0), ('K', 1, -2), ('P', 0, 1), ('Q', -3, -3), ('R', -2, -3), ('b', 0, -5), ('k', 0, 0), ('n', 0, -2), ('p', -1, -4), ('p', 1, -4), ('p', 1, 0), ('q', 0, 2), ('r', -1, -1))\",\"solution_key\":\"san:Qc2 Qxd5 Kxd5 Bf7 Ke5 Bd4\",\"answer_key\":\"answer:Qxd5 Kxd5 Bf7 Ke5 Bd4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qd3#\",\"threat_uci\":\"c2d3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d3, d4 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxd5+ meets the threat cleanly; 34 quiet moves still lose immediately.\",\"Non-direct tries checked: Kf3.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd5 forced\"},{\"ply\":4,\"text\":\"Ke5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd3#\",\"THREAT_UCI: c2d3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d3, d4 in the mate net.\",\"FORCE: Only Qxd5+ meets the threat cleanly; 34 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Kf3.\",\"NOTE 2: Kxd5 forced\",\"NOTE 4: Ke5 forced\"]}","created_at":"2026-07-25 03:17:35","_table":"pcp_chess_puzzles"},{"id":357,"puzzle_hash":"4005b9d22ebe4fd20929cd559a2921aebb7ee6efcb9de5f0c951a635e8cbfd6d","fen":"7q/3b4/3nR2B/1p6/3pB3/3K4/2P2b2/1Q1nk3 b - - 0 1","line_san":"1...Qc8?? 2.Qxd1+!! Kxd1 3.Bf3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qc4#","material_note":"added pb5, bd7; material -2 -> 2; eval -281 -> +119 cp","payload":"{\"puzzle_hash\":\"4005b9d22ebe4fd20929cd559a2921aebb7ee6efcb9de5f0c951a635e8cbfd6d\",\"fen\":\"7q/3b4/3nR2B/1p6/3pB3/3K4/2P2b2/1Q1nk3 b - - 0 1\",\"line_san\":\"1...Qc8?? 2.Qxd1+!! Kxd1 3.Bf3#\",\"generator_seed\":2432537992,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -5, -3), ('B', -3, 0), ('K', -2, 1), ('P', -1, 2), ('Q', 0, 3), ('R', -5, 0), ('b', -6, 1), ('b', -1, -1), ('k', 0, 0), ('n', -5, 1), ('n', 0, 1), ('p', -4, 3), ('p', -3, 1), ('q', -7, -3))\",\"solution_key\":\"san:Qc8 Qxd1 Kxd1 Bf3\",\"answer_key\":\"answer:Qxd1 Kxd1 Bf3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qc4#\",\"threat_uci\":\"c8c4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d2, e2 in the mate net.\",\"material_note\":\"added pb5, bd7; material -2 -> 2; eval -281 -> +119 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qc4#\",\"THREAT_UCI: c8c4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d2, e2 in the mate net.\",\"MATERIAL: added pb5, bd7; material -2 -> 2; eval -281 -> +119 cp\",\"NOTE 2: Kxd1 forced\"]}","created_at":"2026-07-24 09:37:02","_table":"pcp_chess_puzzles"},{"id":356,"puzzle_hash":"5a2319851c2a2e0ba26d2e67f818afd7e471a53115fcb1f56bc8e09bcdc09e93","fen":"2b1B1q1/8/3rk1pb/3N4/1Q1PK3/2B5/2R3Pn/4n3 b - - 0 1","line_san":"1...Nf1?? 2.Qxd6+!! Kxd6 3.Bb4+ Ke6 4.Rc6#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Ng3#","material_note":"added qg8, bc8; material -10 -> 2; eval -796 -> +298 cp","payload":"{\"puzzle_hash\":\"5a2319851c2a2e0ba26d2e67f818afd7e471a53115fcb1f56bc8e09bcdc09e93\",\"fen\":\"2b1B1q1/8/3rk1pb/3N4/1Q1PK3/2B5/2R3Pn/4n3 b - - 0 1\",\"line_san\":\"1...Nf1?? 2.Qxd6+!! Kxd6 3.Bb4+ Ke6 4.Rc6#\",\"generator_seed\":3290810165,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('B', 2, 0), ('K', -2, 0), ('N', -1, -1), ('P', -4, 2), ('P', -2, -1), ('Q', -2, -3), ('R', -4, -2), ('b', 0, 3), ('b', 2, -2), ('k', 0, 0), ('n', -5, 0), ('n', -4, 3), ('p', 0, 2), ('q', 2, 2), ('r', 0, -1))\",\"solution_key\":\"san:Nf1 Qxd6 Kxd6 Bb4 Ke6 Rc6\",\"answer_key\":\"answer:Qxd6 Kxd6 Bb4 Ke6 Rc6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Ng3#\",\"threat_uci\":\"f1g3\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d5, e5, f5 in the mate net.\",\"material_note\":\"added qg8, bc8; material -10 -> 2; eval -796 -> +298 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd6 forced\"},{\"ply\":4,\"text\":\"Ke6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ng3#\",\"THREAT_UCI: f1g3\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d5, e5, f5 in the mate net.\",\"MATERIAL: added qg8, bc8; material -10 -> 2; eval -796 -> +298 cp\",\"NOTE 2: Kxd6 forced\",\"NOTE 4: Ke6 forced\"]}","created_at":"2026-07-24 09:29:02","_table":"pcp_chess_puzzles"},{"id":355,"puzzle_hash":"c76733e95ccc6cb58d66551727684f583abe0b98cc7d35abab3b38cdda360a86","fen":"6R1/1q2p3/1n2k2b/3nPb2/3K1Q2/2PN4/4B3/8 b - - 0 1","line_san":"1...Qc6?? 2.Qxf5+!! Kxf5 3.Bg4#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxc3#","material_note":"added bh6; material -3 -> 0; eval +240 -> +551 cp","payload":"{\"puzzle_hash\":\"c76733e95ccc6cb58d66551727684f583abe0b98cc7d35abab3b38cdda360a86\",\"fen\":\"6R1/1q2p3/1n2k2b/3nPb2/3K1Q2/2PN4/4B3/8 b - - 0 1\",\"line_san\":\"1...Qc6?? 2.Qxf5+!! Kxf5 3.Bg4#\",\"generator_seed\":91542066,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, 0), ('K', -2, -1), ('N', -3, -1), ('P', -3, -2), ('P', -1, 0), ('Q', -2, 1), ('R', 2, 2), ('b', -1, 1), ('b', 0, 3), ('k', 0, 0), ('n', -1, -1), ('n', 0, -3), ('p', 1, 0), ('q', 1, -3))\",\"solution_key\":\"san:Qc6 Qxf5 Kxf5 Bg4\",\"answer_key\":\"answer:Qxf5 Kxf5 Bg4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxc3#\",\"threat_uci\":\"c6c3\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers d5, e5 in the mate net.\",\"material_note\":\"added bh6; material -3 -> 0; eval +240 -> +551 cp\",\"force_notes\":[\"Only Qxf5+ meets the threat cleanly; 35 quiet moves still lose immediately.\",\"Non-direct tries checked: Rc8.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxc3#\",\"THREAT_UCI: c6c3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers d5, e5 in the mate net.\",\"MATERIAL: added bh6; material -3 -> 0; eval +240 -> +551 cp\",\"FORCE: Only Qxf5+ meets the threat cleanly; 35 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Rc8.\",\"NOTE 2: Kxf5 forced\"]}","created_at":"2026-07-24 06:55:46","_table":"pcp_chess_puzzles"},{"id":354,"puzzle_hash":"3351814780c9dd81056ff13c413c111be9fe9b90e9922e68b4c8294da2b0df31","fen":"3q1b2/8/2rp2P1/n1pK1k1B/3n1r2/B7/6RQ/8 b - - 0 1","line_san":"1...Nb5?? 2.Qxf4+!! Kxf4 3.Bc1+ Kf5 4.Rf2#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Nc7#","material_note":"added bf8, qd8; material -3 -> 9; eval -548 -> +636 cp","payload":"{\"puzzle_hash\":\"3351814780c9dd81056ff13c413c111be9fe9b90e9922e68b4c8294da2b0df31\",\"fen\":\"3q1b2/8/2rp2P1/n1pK1k1B/3n1r2/B7/6RQ/8 b - - 0 1\",\"line_san\":\"1...Nb5?? 2.Qxf4+!! Kxf4 3.Bc1+ Kf5 4.Rf2#\",\"generator_seed\":3188399542,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -5, -2), ('B', 2, 0), ('K', -2, 0), ('P', 1, 1), ('Q', 2, -3), ('R', 1, -3), ('b', 0, 3), ('k', 0, 0), ('n', -5, 0), ('n', -2, -1), ('p', -3, 0), ('p', -2, 1), ('q', -2, 3), ('r', -3, 1), ('r', 0, -1))\",\"solution_key\":\"san:Nb5 Qxf4 Kxf4 Bc1 Kf5 Rf2\",\"answer_key\":\"answer:Qxf4 Kxf4 Bc1 Kf5 Rf2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Nc7#\",\"threat_uci\":\"b5c7\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e4, e5, e6 in the mate net.\",\"material_note\":\"added bf8, qd8; material -3 -> 9; eval -548 -> +636 cp\",\"force_notes\":[\"Only Qxf4+ wins; 21 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf4 forced\"},{\"ply\":4,\"text\":\"Kf5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Nc7#\",\"THREAT_UCI: b5c7\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e4, e5, e6 in the mate net.\",\"MATERIAL: added bf8, qd8; material -3 -> 9; eval -548 -> +636 cp\",\"FORCE: Only Qxf4+ wins; 21 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: Kxf4 forced\",\"NOTE 4: Kf5 forced\"]}","created_at":"2026-07-24 06:53:48","_table":"pcp_chess_puzzles"},{"id":353,"puzzle_hash":"f63ded1af7770e752881691973aa34aee3faee82ceef6435fbb8539c081ddda9","fen":"2N5/3Q1R2/P1r5/pk1nKP2/NpqpP3/2n5/8/8 b - - 0 1","line_san":"1...Qe2?? 2.Qxc6+!! Kxc6 3.Na7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxe4#","material_note":null,"payload":"{\"puzzle_hash\":\"f63ded1af7770e752881691973aa34aee3faee82ceef6435fbb8539c081ddda9\",\"fen\":\"2N5/3Q1R2/P1r5/pk1nKP2/NpqpP3/2n5/8/8 b - - 0 1\",\"line_san\":\"1...Qe2?? 2.Qxc6+!! Kxc6 3.Na7#\",\"generator_seed\":4231422110,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('K', -3, 0), ('N', -1, -3), ('N', 1, 1), ('P', -4, 0), ('P', -3, 1), ('P', 1, -1), ('Q', -2, -2), ('R', -4, -2), ('k', 0, 0), ('n', -2, 0), ('n', -1, 2), ('p', -2, 1), ('p', 0, 1), ('p', 1, 0), ('q', -1, 1), ('r', -1, -1))\",\"solution_key\":\"san:Qe2 Qxc6 Kxc6 Na7\",\"answer_key\":\"answer:Qxc6 Kxc6 Na7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxe4#\",\"threat_uci\":\"e2e4\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":null,\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxe4#\",\"THREAT_UCI: e2e4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"NOTE 2: Kxc6 forced\"]}","created_at":"2026-07-24 06:17:24","_table":"pcp_chess_puzzles"},{"id":351,"puzzle_hash":"4c5045feaf6962dbb9b23675456b545b8c9ff8d96c2615b9404da2e468bfecf2","fen":"1q1r4/1p1p3Q/1P1p4/1K1pB3/5pB1/3n4/2kP3R/2b5 b - - 0 1","line_san":"1...Qa8?? 2.Qxd3+!! Kxd3 3.Bf5#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qa6#","material_note":"added pf4, pd7; material 1 -> 3; eval +0 -> +821 cp","payload":"{\"puzzle_hash\":\"4c5045feaf6962dbb9b23675456b545b8c9ff8d96c2615b9404da2e468bfecf2\",\"fen\":\"1q1r4/1p1p3Q/1P1p4/1K1pB3/5pB1/3n4/2kP3R/2b5 b - - 0 1\",\"line_san\":\"1...Qa8?? 2.Qxd3+!! Kxd3 3.Bf5#\",\"generator_seed\":2092918490,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', -2, -3), ('K', 1, -3), ('P', -1, 0), ('P', 1, -4), ('Q', -5, -5), ('R', -5, 0), ('b', 0, 1), ('k', 0, 0), ('n', -1, -1), ('p', -3, -2), ('p', -1, -5), ('p', -1, -4), ('p', -1, -3), ('p', 1, -5), ('q', 1, -6), ('r', -1, -6))\",\"solution_key\":\"san:Qa8 Qxd3 Kxd3 Bf5\",\"answer_key\":\"answer:Qxd3 Kxd3 Bf5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qa6#\",\"threat_uci\":\"a8a6\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added pf4, pd7; material 1 -> 3; eval +0 -> +821 cp\",\"force_notes\":[\"Only Qxd3+ wins; 37 quiet moves allow mate in 1.\",\"1 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qa6#\",\"THREAT_UCI: a8a6\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added pf4, pd7; material 1 -> 3; eval +0 -> +821 cp\",\"FORCE: Only Qxd3+ wins; 37 quiet moves allow mate in 1.\",\"FORCE: 1 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd3 forced\"]}","created_at":"2026-07-24 05:16:35","_table":"pcp_chess_puzzles"},{"id":350,"puzzle_hash":"d12177269ba6036779acf1efaf9fe114efb2b27f920af20fa53567f6e60a570a","fen":"2b4r/4nr2/5Pp1/6Kn/6N1/Q5bk/3BP3/4N3 b - - 0 1","line_san":"1...Nf4?? 2.Qxg3+!! Kxg3 3.Bxf4+ Kh3 4.Nf2#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rh5#","material_note":"added bc8; material 0 -> 3; eval -168 -> +555 cp","payload":"{\"puzzle_hash\":\"d12177269ba6036779acf1efaf9fe114efb2b27f920af20fa53567f6e60a570a\",\"fen\":\"2b4r/4nr2/5Pp1/6Kn/6N1/Q5bk/3BP3/4N3 b - - 0 1\",\"line_san\":\"1...Nf4?? 2.Qxg3+!! Kxg3 3.Bxf4+ Kh3 4.Nf2#\",\"generator_seed\":2461114395,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, -1), ('K', -1, 2), ('N', -3, -2), ('N', -1, 1), ('P', -3, -1), ('P', -2, 3), ('Q', -7, 0), ('b', -5, 5), ('b', -1, 0), ('k', 0, 0), ('n', -3, 4), ('n', 0, 2), ('p', -1, 3), ('r', -2, 4), ('r', 0, 5))\",\"solution_key\":\"san:Nf4 Qxg3 Kxg3 Bxf4 Kh3 Nf2\",\"answer_key\":\"answer:Qxg3 Kxg3 Bxf4 Kh3 Nf2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rh5#\",\"threat_uci\":\"h8h5\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers g4, h4 in the mate net.\",\"material_note\":\"added bc8; material 0 -> 3; eval -168 -> +555 cp\",\"force_notes\":[\"Only Qxg3+ wins; 35 quiet moves allow mate in 1.\",\"1 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg3 forced\"},{\"ply\":4,\"text\":\"Kh3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rh5#\",\"THREAT_UCI: h8h5\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers g4, h4 in the mate net.\",\"MATERIAL: added bc8; material 0 -> 3; eval -168 -> +555 cp\",\"FORCE: Only Qxg3+ wins; 35 quiet moves allow mate in 1.\",\"FORCE: 1 checking tries do not solve the puzzle.\",\"NOTE 2: Kxg3 forced\",\"NOTE 4: Kh3 forced\"]}","created_at":"2026-07-24 04:59:59","_table":"pcp_chess_puzzles"},{"id":349,"puzzle_hash":"8786466ed07d313be0fdaee0bd96895ec368f5d691c8a8d1661804a181cc0843","fen":"1Nb5/1pkpP1B1/1p3Q2/1K2R3/2p3n1/8/1n6/2q5 b - - 0 1","line_san":"1...Qc2?? 2.Qd6+!! Kxd6 3.e8=N#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qa4#","material_note":"added ng4; material -2 -> 1; eval -288 -> +489 cp","payload":"{\"puzzle_hash\":\"8786466ed07d313be0fdaee0bd96895ec368f5d691c8a8d1661804a181cc0843\",\"fen\":\"1Nb5/1pkpP1B1/1p3Q2/1K2R3/2p3n1/8/1n6/2q5 b - - 0 1\",\"line_san\":\"1...Qc2?? 2.Qd6+!! Kxd6 3.e8=N#\",\"generator_seed\":3289564213,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, 0), ('K', 1, -2), ('N', 1, 1), ('P', -2, 0), ('Q', -3, -1), ('R', -2, -2), ('b', 0, 1), ('k', 0, 0), ('n', -4, -3), ('n', 1, -5), ('p', -1, 0), ('p', 0, -3), ('p', 1, -1), ('p', 1, 0), ('q', 0, -6))\",\"solution_key\":\"san:Qc2 Qd6 Kxd6 e8=N\",\"answer_key\":\"answer:Qd6 Kxd6 e8=N\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qa4#\",\"threat_uci\":\"c2a4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers b6, c6 in the mate net.\",\"material_note\":\"added ng4; material -2 -> 1; eval -288 -> +489 cp\",\"force_notes\":[\"Only Qd6+ wins; 30 quiet moves allow mate in 1.\",\"5 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: knight-promotion-mate\",\"THREAT: Black threatens Qa4#\",\"THREAT_UCI: c2a4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers b6, c6 in the mate net.\",\"MATERIAL: added ng4; material -2 -> 1; eval -288 -> +489 cp\",\"FORCE: Only Qd6+ wins; 30 quiet moves allow mate in 1.\",\"FORCE: 5 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd6 forced\"]}","created_at":"2026-07-23 12:58:47","_table":"pcp_chess_puzzles"},{"id":348,"puzzle_hash":"8991d3b31073ef5560f60dcd4790650253071d3825553aa23b311cd92a473925","fen":"3BQ3/5R2/2p5/8/1nK3B1/2n1b3/2pk3r/1r6 b - - 0 1","line_san":"1...Nb5?? 2.Qxe3+!! Kxe3 3.Bg5+ Ke4 4.Re7#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens c1=Q#","material_note":"added rh2; material -4 -> 1; eval +137 -> +896 cp","payload":"{\"puzzle_hash\":\"8991d3b31073ef5560f60dcd4790650253071d3825553aa23b311cd92a473925\",\"fen\":\"3BQ3/5R2/2p5/8/1nK3B1/2n1b3/2pk3r/1r6 b - - 0 1\",\"line_san\":\"1...Nb5?? 2.Qxe3+!! Kxe3 3.Bg5+ Ke4 4.Re7#\",\"generator_seed\":140567249,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -6, 0), ('B', -2, -3), ('K', -2, 1), ('Q', -6, -1), ('R', -5, -2), ('b', -1, -1), ('k', 0, 0), ('n', -2, 2), ('n', -1, 1), ('p', -4, 1), ('p', 0, 1), ('r', 0, -4), ('r', 1, 2))\",\"solution_key\":\"san:Nb5 Qxe3 Kxe3 Bg5 Ke4 Re7\",\"answer_key\":\"answer:Qxe3 Kxe3 Bg5 Ke4 Re7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens c1=Q#\",\"threat_uci\":\"c2c1q\",\"threat_piece\":\"P=Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c3, d3 in the mate net.\",\"material_note\":\"added rh2; material -4 -> 1; eval +137 -> +896 cp\",\"force_notes\":[\"Only Qxe3+ wins; 36 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe3 forced\"},{\"ply\":4,\"text\":\"Ke4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens c1=Q#\",\"THREAT_UCI: c2c1q\",\"THREAT_PIECE: P=Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c3, d3 in the mate net.\",\"MATERIAL: added rh2; material -4 -> 1; eval +137 -> +896 cp\",\"FORCE: Only Qxe3+ wins; 36 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe3 forced\",\"NOTE 4: Ke4 forced\"]}","created_at":"2026-07-23 11:49:00","_table":"pcp_chess_puzzles"},{"id":347,"puzzle_hash":"11ff36eab110540a7f376f133a770a0a889cae89f2b5d0e13c65fec4f1694073","fen":"8/r7/1N1N4/3Q3R/1p1nn3/1p1k2q1/pK2pP2/B7 b - - 0 1","line_san":"1...Qg1?? 2.Qxd4+!! Kxd4 3.Rd5#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qb1#","material_note":"added ra7; material -5 -> 0; eval -15 -> +508 cp","payload":"{\"puzzle_hash\":\"11ff36eab110540a7f376f133a770a0a889cae89f2b5d0e13c65fec4f1694073\",\"fen\":\"8/r7/1N1N4/3Q3R/1p1nn3/1p1k2q1/pK2pP2/B7 b - - 0 1\",\"line_san\":\"1...Qg1?? 2.Qxd4+!! Kxd4 3.Rd5#\",\"generator_seed\":2541913100,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, -2), ('K', -2, -1), ('N', -2, 3), ('N', 0, 3), ('P', 2, -1), ('Q', 0, 2), ('R', 4, 2), ('k', 0, 0), ('n', 0, 1), ('n', 1, 1), ('p', -3, -1), ('p', -2, 0), ('p', -2, 1), ('p', 1, -1), ('q', 3, 0), ('r', -3, 4))\",\"solution_key\":\"san:Qg1 Qxd4 Kxd4 Rd5\",\"answer_key\":\"answer:Qxd4 Kxd4 Rd5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qb1#\",\"threat_uci\":\"g1b1\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c2, c3 in the mate net.\",\"material_note\":\"added ra7; material -5 -> 0; eval -15 -> +508 cp\",\"force_notes\":[\"Only Qxd4+ meets the threat cleanly; 34 quiet moves still lose immediately.\",\"Non-direct tries checked: Rh1.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qb1#\",\"THREAT_UCI: g1b1\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c2, c3 in the mate net.\",\"MATERIAL: added ra7; material -5 -> 0; eval -15 -> +508 cp\",\"FORCE: Only Qxd4+ meets the threat cleanly; 34 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Rh1.\",\"NOTE 2: Kxd4 forced\"]}","created_at":"2026-07-23 07:29:07","_table":"pcp_chess_puzzles"},{"id":346,"puzzle_hash":"d8e6820a30e2c750a61e603226fe44ffae873f0d3ddf1978a0a5bac5305e8d7b","fen":"1q6/5Q2/3p2R1/8/4b3/2B5/n1PKPb2/5k2 b - - 0 1","line_san":"1...Qb1?? 2.Qxf2+!! Kxf2 3.Bd4+ Kf1 4.Rg1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qxc2#","material_note":"added na2; material -3 -> 0; eval +0 -> +302 cp","payload":"{\"puzzle_hash\":\"d8e6820a30e2c750a61e603226fe44ffae873f0d3ddf1978a0a5bac5305e8d7b\",\"fen\":\"1q6/5Q2/3p2R1/8/4b3/2B5/n1PKPb2/5k2 b - - 0 1\",\"line_san\":\"1...Qb1?? 2.Qxf2+!! Kxf2 3.Bd4+ Kf1 4.Rg1#\",\"generator_seed\":2120914017,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('K', -2, -1), ('P', -3, -1), ('P', -1, -1), ('Q', 0, -6), ('R', 1, -5), ('b', -1, -3), ('b', 0, -1), ('k', 0, 0), ('n', -5, -1), ('p', -2, -5), ('q', -4, -7))\",\"solution_key\":\"san:Qb1 Qxf2 Kxf2 Bd4 Kf1 Rg1\",\"answer_key\":\"answer:Qxf2 Kxf2 Bd4 Kf1 Rg1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qxc2#\",\"threat_uci\":\"b1c2\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers e1, e2 in the mate net.\",\"material_note\":\"added na2; material -3 -> 0; eval +0 -> +302 cp\",\"force_notes\":[\"Only Qxf2+ wins; 39 quiet moves allow mate in 1.\",\"1 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf2 forced\"},{\"ply\":4,\"text\":\"Kf1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxc2#\",\"THREAT_UCI: b1c2\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers e1, e2 in the mate net.\",\"MATERIAL: added na2; material -3 -> 0; eval +0 -> +302 cp\",\"FORCE: Only Qxf2+ wins; 39 quiet moves allow mate in 1.\",\"FORCE: 1 checking tries do not solve the puzzle.\",\"NOTE 2: Kxf2 forced\",\"NOTE 4: Kf1 forced\"]}","created_at":"2026-07-23 07:08:46","_table":"pcp_chess_puzzles"},{"id":345,"puzzle_hash":"5d9935a14664b1ca792e51018d70d1e37f4998dbb518b7efc15858192fc4f57d","fen":"8/N3R3/2p2N2/1pk2r2/3r1n2/1Kp5/1bp1P3/2q1B1Q1 b - - 0 1","line_san":"1...Qa1?? 2.Qxd4+!! Kxd4 3.Bf2#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qa4#","material_note":"added nf4, rf5; material -3 -> 5; eval -827 -> +237 cp","payload":"{\"puzzle_hash\":\"5d9935a14664b1ca792e51018d70d1e37f4998dbb518b7efc15858192fc4f57d\",\"fen\":\"8/N3R3/2p2N2/1pk2r2/3r1n2/1Kp5/1bp1P3/2q1B1Q1 b - - 0 1\",\"line_san\":\"1...Qa1?? 2.Qxd4+!! Kxd4 3.Bf2#\",\"generator_seed\":2584997312,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('K', -2, 1), ('N', 1, -3), ('N', 2, 2), ('P', -3, -2), ('Q', -4, -4), ('R', 2, -2), ('b', -3, 1), ('k', 0, 0), ('n', -1, -3), ('p', -3, 0), ('p', -2, 0), ('p', 0, 1), ('p', 1, 0), ('q', -4, 0), ('r', -1, -1), ('r', 0, -3))\",\"solution_key\":\"san:Qa1 Qxd4 Kxd4 Bf2\",\"answer_key\":\"answer:Qxd4 Kxd4 Bf2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qa4#\",\"threat_uci\":\"a1a4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers b4, c4 in the mate net.\",\"material_note\":\"added nf4, rf5; material -3 -> 5; eval -827 -> +237 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qa4#\",\"THREAT_UCI: a1a4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers b4, c4 in the mate net.\",\"MATERIAL: added nf4, rf5; material -3 -> 5; eval -827 -> +237 cp\",\"NOTE 2: Kxd4 forced\"]}","created_at":"2026-07-22 21:40:28","_table":"pcp_chess_puzzles"},{"id":344,"puzzle_hash":"6a483b5b68cddda61e25ecd9a7677943fe6fc1264207d501f5435a783b4f99a8","fen":"8/1B6/2Q5/8/pR4n1/1P4p1/2b1K1p1/B1k3bq b - - 0 1","line_san":"1...Bb6?? 2.Qxc2+!! Kxc2 3.Be4+ Kc1 4.Rc4#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qd1#","material_note":"added pa4, pg3; material -2 -> 0; eval +99994 -> +789 cp","payload":"{\"puzzle_hash\":\"6a483b5b68cddda61e25ecd9a7677943fe6fc1264207d501f5435a783b4f99a8\",\"fen\":\"8/1B6/2Q5/8/pR4n1/1P4p1/2b1K1p1/B1k3bq b - - 0 1\",\"line_san\":\"1...Bb6?? 2.Qxc2+!! Kxc2 3.Be4+ Kc1 4.Rc4#\",\"generator_seed\":2249298022,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -6, -1), ('B', 0, -2), ('K', -1, 2), ('P', -2, -1), ('Q', -5, 0), ('R', -3, -1), ('b', -1, 0), ('b', 0, 4), ('k', 0, 0), ('n', -3, 4), ('p', -3, -2), ('p', -2, 4), ('p', -1, 4), ('q', 0, 5))\",\"solution_key\":\"san:Bb6 Qxc2 Kxc2 Be4 Kc1 Rc4\",\"answer_key\":\"answer:Qxc2 Kxc2 Be4 Kc1 Rc4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qd1#\",\"threat_uci\":\"h1d1\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d1, d2 in the mate net.\",\"material_note\":\"added pa4, pg3; material -2 -> 0; eval +99994 -> +789 cp\",\"force_notes\":[\"Only Qxc2+ meets the threat cleanly; 36 quiet moves still lose immediately.\",\"Non-direct tries checked: Kf3.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc2 forced\"},{\"ply\":4,\"text\":\"Kc1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd1#\",\"THREAT_UCI: h1d1\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d1, d2 in the mate net.\",\"MATERIAL: added pa4, pg3; material -2 -> 0; eval +99994 -> +789 cp\",\"FORCE: Only Qxc2+ meets the threat cleanly; 36 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Kf3.\",\"NOTE 2: Kxc2 forced\",\"NOTE 4: Kc1 forced\"]}","created_at":"2026-07-22 21:11:32","_table":"pcp_chess_puzzles"},{"id":343,"puzzle_hash":"bcdfe86b96cf65153aca44b60828bf1b48d258367275cb4ddc7231e1d844e17c","fen":"8/q1n5/p7/2p2B2/p1K1Nb2/2P2k2/4nPp1/2R1Q3 b - - 0 1","line_san":"1...Qb7?? 2.Qxe2+!! Kxe2 3.Bg4#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qb5#","material_note":"added pa4; material -1 -> 0; eval +241 -> +526 cp","payload":"{\"puzzle_hash\":\"bcdfe86b96cf65153aca44b60828bf1b48d258367275cb4ddc7231e1d844e17c\",\"fen\":\"8/q1n5/p7/2p2B2/p1K1Nb2/2P2k2/4nPp1/2R1Q3 b - - 0 1\",\"line_san\":\"1...Qb7?? 2.Qxe2+!! Kxe2 3.Bg4#\",\"generator_seed\":3850300917,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -2, 0), ('K', -1, -3), ('N', -1, -1), ('P', 0, -3), ('P', 1, 0), ('Q', 2, -1), ('R', 2, -3), ('b', -1, 0), ('k', 0, 0), ('n', -4, -3), ('n', 1, -1), ('p', -3, -5), ('p', -2, -3), ('p', -1, -5), ('p', 1, 1), ('q', -4, -5))\",\"solution_key\":\"san:Qb7 Qxe2 Kxe2 Bg4\",\"answer_key\":\"answer:Qxe2 Kxe2 Bg4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qb5#\",\"threat_uci\":\"b7b5\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added pa4; material -1 -> 0; eval +241 -> +526 cp\",\"force_notes\":[\"Only Qxe2+ meets the threat cleanly; 20 quiet moves still lose immediately.\",\"Non-direct tries checked: Kd3.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe2 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qb5#\",\"THREAT_UCI: b7b5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added pa4; material -1 -> 0; eval +241 -> +526 cp\",\"FORCE: Only Qxe2+ meets the threat cleanly; 20 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Kd3.\",\"NOTE 2: Kxe2 forced\"]}","created_at":"2026-07-22 04:11:22","_table":"pcp_chess_puzzles"},{"id":342,"puzzle_hash":"b6019f4cbcf8e2d1a6f22ec6c2db42f4d1afd66776f25339900187398be8f5bd","fen":"8/2Q5/4B1r1/B1R5/1n3r2/4p1kP/4K1p1/6bq b - - 0 1","line_san":"1...Bf2?? 2.Qxf4+!! Kxf4 3.Bc7+ Ke4 4.Rc4#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qf1#","material_note":"added rg6; material 1 -> 6; eval -678 -> +299 cp","payload":"{\"puzzle_hash\":\"b6019f4cbcf8e2d1a6f22ec6c2db42f4d1afd66776f25339900187398be8f5bd\",\"fen\":\"8/2Q5/4B1r1/B1R5/1n3r2/4p1kP/4K1p1/6bq b - - 0 1\",\"line_san\":\"1...Bf2?? 2.Qxf4+!! Kxf4 3.Bc7+ Ke4 4.Rc4#\",\"generator_seed\":2679561914,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -6, -2), ('B', -2, -3), ('K', -2, 1), ('P', 1, 0), ('Q', -4, -4), ('R', -4, -2), ('b', 0, 2), ('k', 0, 0), ('n', -5, -1), ('p', -2, 0), ('p', 0, 1), ('q', 1, 2), ('r', -1, -1), ('r', 0, -3))\",\"solution_key\":\"san:Bf2 Qxf4 Kxf4 Bc7 Ke4 Rc4\",\"answer_key\":\"answer:Qxf4 Kxf4 Bc7 Ke4 Rc4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qf1#\",\"threat_uci\":\"h1f1\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f2, f3 in the mate net.\",\"material_note\":\"added rg6; material 1 -> 6; eval -678 -> +299 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf4 forced\"},{\"ply\":4,\"text\":\"Ke4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qf1#\",\"THREAT_UCI: h1f1\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f2, f3 in the mate net.\",\"MATERIAL: added rg6; material 1 -> 6; eval -678 -> +299 cp\",\"NOTE 2: Kxf4 forced\",\"NOTE 4: Ke4 forced\"]}","created_at":"2026-07-22 03:38:09","_table":"pcp_chess_puzzles"},{"id":341,"puzzle_hash":"72d069268aec5f5cc34541ddb3271bf864499ea29bdab0522f0d73b2e3d836c0","fen":"2Bb1r2/4r3/2p1p3/3kPp1b/1P1n1K1p/4R3/1N1Q4/7n b - - 0 1","line_san":"1...Rg7?? 2.Qxd4+!! Kxd4 3.Rd3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Rg4#","material_note":"added rf8, bh5, ph4; material -5 -> 4; eval -528 -> +648 cp","payload":"{\"puzzle_hash\":\"72d069268aec5f5cc34541ddb3271bf864499ea29bdab0522f0d73b2e3d836c0\",\"fen\":\"2Bb1r2/4r3/2p1p3/3kPp1b/1P1n1K1p/4R3/1N1Q4/7n b - - 0 1\",\"line_san\":\"1...Rg7?? 2.Qxd4+!! Kxd4 3.Rd3#\",\"generator_seed\":780617846,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, -1), ('K', 1, 2), ('N', 3, -2), ('P', 0, 1), ('P', 1, -2), ('Q', 3, 0), ('R', 2, 1), ('b', -3, 0), ('b', 0, 4), ('k', 0, 0), ('n', 1, 0), ('n', 4, 4), ('p', -1, -1), ('p', -1, 1), ('p', 0, 2), ('p', 1, 4), ('r', -3, 2), ('r', -2, 1))\",\"solution_key\":\"san:Rg7 Qxd4 Kxd4 Rd3\",\"answer_key\":\"answer:Qxd4 Kxd4 Rd3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Rg4#\",\"threat_uci\":\"g7g4\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e4, e5 in the mate net.\",\"material_note\":\"added rf8, bh5, ph4; material -5 -> 4; eval -528 -> +648 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rg4#\",\"THREAT_UCI: g7g4\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e4, e5 in the mate net.\",\"MATERIAL: added rf8, bh5, ph4; material -5 -> 4; eval -528 -> +648 cp\",\"NOTE 2: Kxd4 forced\"]}","created_at":"2026-07-20 21:56:03","_table":"pcp_chess_puzzles"},{"id":340,"puzzle_hash":"405fdf0c5c6175d06ccd5b791e5292731cccb378a5a76e561efbb8491d48748c","fen":"4QR2/6r1/p1p5/2P5/2KP2B1/4b1N1/2pk3r/2q1N3 b - - 0 1","line_san":"1...Qb2?? 2.Qxe3+!! Kxe3 3.Nf1+ Ke4 4.Bf3#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qc3#","material_note":"added rh2, rg7, pa6; material -11 -> 0; eval -796 -> +332 cp","payload":"{\"puzzle_hash\":\"405fdf0c5c6175d06ccd5b791e5292731cccb378a5a76e561efbb8491d48748c\",\"fen\":\"4QR2/6r1/p1p5/2P5/2KP2B1/4b1N1/2pk3r/2q1N3 b - - 0 1\",\"line_san\":\"1...Qb2?? 2.Qxe3+!! Kxe3 3.Nf1+ Ke4 4.Bf3#\",\"generator_seed\":606557612,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('K', 1, -2), ('N', -3, -1), ('N', -1, 1), ('P', 0, -2), ('P', 1, -3), ('Q', -1, -6), ('R', -2, -6), ('b', -1, -1), ('k', 0, 0), ('p', 1, -4), ('p', 1, 0), ('p', 3, -4), ('q', 1, 1), ('r', -4, 0), ('r', -3, -5))\",\"solution_key\":\"san:Qb2 Qxe3 Kxe3 Nf1 Ke4 Bf3\",\"answer_key\":\"answer:Qxe3 Kxe3 Nf1 Ke4 Bf3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qc3#\",\"threat_uci\":\"b2c3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c3, d3 in the mate net.\",\"material_note\":\"added rh2, rg7, pa6; material -11 -> 0; eval -796 -> +332 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe3 forced\"},{\"ply\":4,\"text\":\"Ke4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qc3#\",\"THREAT_UCI: b2c3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c3, d3 in the mate net.\",\"MATERIAL: added rh2, rg7, pa6; material -11 -> 0; eval -796 -> +332 cp\",\"NOTE 2: Kxe3 forced\",\"NOTE 4: Ke4 forced\"]}","created_at":"2026-07-20 21:54:50","_table":"pcp_chess_puzzles"},{"id":339,"puzzle_hash":"5438343668e98650e9fc6f5ea68050765612ac2b927182b385abe0271a0063e7","fen":"1B2b1k1/6Np/3QPK1p/4P3/2B2p2/5n1n/3b4/3q4 b - - 0 1","line_san":"1...Qg1?? 2.Qf8+!! Kxf8 3.e7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qg5#","material_note":"added nh3, ph6; material 0 -> 4; eval -222 -> +164 cp","payload":"{\"puzzle_hash\":\"5438343668e98650e9fc6f5ea68050765612ac2b927182b385abe0271a0063e7\",\"fen\":\"1B2b1k1/6Np/3QPK1p/4P3/2B2p2/5n1n/3b4/3q4 b - - 0 1\",\"line_san\":\"1...Qg1?? 2.Qf8+!! Kxf8 3.e7#\",\"generator_seed\":752815326,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -5, 0), ('B', -4, -4), ('K', -1, -2), ('N', 0, -1), ('P', -2, -3), ('P', -2, -2), ('Q', -3, -2), ('b', -3, -6), ('b', -2, 0), ('k', 0, 0), ('n', -1, -5), ('n', 1, -5), ('p', -1, -4), ('p', 1, -2), ('p', 1, -1), ('q', -3, -7))\",\"solution_key\":\"san:Qg1 Qf8 Kxf8 e7\",\"answer_key\":\"answer:Qf8 Kxf8 e7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qg5#\",\"threat_uci\":\"g1g5\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f7, g7 in the mate net.\",\"material_note\":\"added nh3, ph6; material 0 -> 4; eval -222 -> +164 cp\",\"force_notes\":[\"Only Qf8+ meets the threat cleanly; 28 quiet moves still lose immediately.\",\"Non-direct tries checked: Ke7.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf8 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: pawn-mate\",\"THREAT: Black threatens Qg5#\",\"THREAT_UCI: g1g5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f7, g7 in the mate net.\",\"MATERIAL: added nh3, ph6; material 0 -> 4; eval -222 -> +164 cp\",\"FORCE: Only Qf8+ meets the threat cleanly; 28 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Ke7.\",\"NOTE 2: Kxf8 forced\"]}","created_at":"2026-07-20 21:05:11","_table":"pcp_chess_puzzles"},{"id":338,"puzzle_hash":"fc247c2f76a1956f7bd613f59d97a56190b87f4b8b1e02baef75b9a442275945","fen":"8/2rn1B2/1bpK2n1/2p2k2/4b3/2R2pB1/4Q3/8 b - - 0 1","line_san":"1...Nb8?? 2.Qxe4+!! Kxe4 3.Bxg6+ Kd4 4.Be5#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rd7#","material_note":null,"payload":"{\"puzzle_hash\":\"fc247c2f76a1956f7bd613f59d97a56190b87f4b8b1e02baef75b9a442275945\",\"fen\":\"8/2rn1B2/1bpK2n1/2p2k2/4b3/2R2pB1/4Q3/8 b - - 0 1\",\"line_san\":\"1...Nb8?? 2.Qxe4+!! Kxe4 3.Bxg6+ Kd4 4.Be5#\",\"generator_seed\":2390681524,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -2, -1), ('B', 2, 0), ('K', 1, 2), ('Q', -3, 1), ('R', -2, 3), ('b', -1, 1), ('b', 1, 4), ('k', 0, 0), ('n', 1, -1), ('n', 2, 2), ('p', -2, 0), ('p', 0, 3), ('p', 1, 3), ('r', 2, 3))\",\"solution_key\":\"san:Nb8 Qxe4 Kxe4 Bxg6 Kd4 Be5\",\"answer_key\":\"answer:Qxe4 Kxe4 Bxg6 Kd4 Be5\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rd7#\",\"threat_uci\":\"c7d7\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e5, e6 in the mate net.\",\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"If Kf6, Qxg6#\"},{\"ply\":4,\"text\":\"Kd4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rd7#\",\"THREAT_UCI: c7d7\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e5, e6 in the mate net.\",\"NOTE 2: If Kf6, Qxg6#\",\"NOTE 4: Kd4 forced\"]}","created_at":"2026-07-20 21:04:02","_table":"pcp_chess_puzzles"},{"id":337,"puzzle_hash":"aa2832b11248bef49d2b4222cf1a0f2ca3a881c8845f565a71ceb2555af5a328","fen":"1Q6/5R2/PpNp3r/1k1K1p1p/pN6/5n1q/3n4/8 b - - 0 1","line_san":"1...Qg4?? 2.Qxb6+!! Kxb6 3.Rb7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qc4#","material_note":"added ph5, nd2; material 0 -> 4; eval +0 -> +111 cp","payload":"{\"puzzle_hash\":\"aa2832b11248bef49d2b4222cf1a0f2ca3a881c8845f565a71ceb2555af5a328\",\"fen\":\"1Q6/5R2/PpNp3r/1k1K1p1p/pN6/5n1q/3n4/8 b - - 0 1\",\"line_san\":\"1...Qg4?? 2.Qxb6+!! Kxb6 3.Rb7#\",\"generator_seed\":3329265697,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('K', -2, 0), ('N', -1, -1), ('N', 0, 1), ('P', 1, -1), ('Q', 0, -3), ('R', -4, -2), ('k', 0, 0), ('n', -4, 2), ('n', -2, 3), ('p', -6, 0), ('p', -4, 0), ('p', -2, -1), ('p', 0, -1), ('p', 1, 1), ('q', -6, 2), ('r', -6, -1))\",\"solution_key\":\"san:Qg4 Qxb6 Kxb6 Rb7\",\"answer_key\":\"answer:Qxb6 Kxb6 Rb7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qc4#\",\"threat_uci\":\"g4c4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c4, c5, c6 in the mate net.\",\"material_note\":\"added ph5, nd2; material 0 -> 4; eval +0 -> +111 cp\",\"force_notes\":[\"Only Qxb6+ meets the threat cleanly; 28 quiet moves still lose immediately.\",\"Non-direct tries checked: Rf6.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxb6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qc4#\",\"THREAT_UCI: g4c4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c4, c5, c6 in the mate net.\",\"MATERIAL: added ph5, nd2; material 0 -> 4; eval +0 -> +111 cp\",\"FORCE: Only Qxb6+ meets the threat cleanly; 28 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Rf6.\",\"NOTE 2: Kxb6 forced\"]}","created_at":"2026-07-20 19:25:12","_table":"pcp_chess_puzzles"},{"id":336,"puzzle_hash":"96125adcd39b99936a96961970e1af5707d78461d3ce6a52b4d562eb4ff664a6","fen":"1R6/Q5b1/8/1PrN4/Bqk1K2B/1p6/6n1/4n3 b - - 0 1","line_san":"1...Qd2?? 2.Qxc5+!! Kxc5 3.Be7+ Kc4 4.Rc8#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qd3#","material_note":null,"payload":"{\"puzzle_hash\":\"96125adcd39b99936a96961970e1af5707d78461d3ce6a52b4d562eb4ff664a6\",\"fen\":\"1R6/Q5b1/8/1PrN4/Bqk1K2B/1p6/6n1/4n3 b - - 0 1\",\"line_san\":\"1...Qd2?? 2.Qxc5+!! Kxc5 3.Be7+ Kc4 4.Rc8#\",\"generator_seed\":1231923120,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -5, 0), ('B', 2, 0), ('K', -2, 0), ('N', -1, -1), ('P', 1, -1), ('Q', 2, -3), ('R', 1, -4), ('b', -4, -3), ('k', 0, 0), ('n', -4, 2), ('n', -2, 3), ('p', 1, 1), ('q', 1, 0), ('r', 0, -1))\",\"solution_key\":\"san:Qd2 Qxc5 Kxc5 Be7 Kc4 Rc8\",\"answer_key\":\"answer:Qxc5 Kxc5 Be7 Kc4 Rc8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qd3#\",\"threat_uci\":\"d2d3\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d3, d4, d5 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxc5+ meets the threat cleanly; 33 quiet moves still lose immediately.\",\"Non-direct tries checked: Kf5.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc5 forced\"},{\"ply\":4,\"text\":\"Kc4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd3#\",\"THREAT_UCI: d2d3\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d3, d4, d5 in the mate net.\",\"FORCE: Only Qxc5+ meets the threat cleanly; 33 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Kf5.\",\"NOTE 2: Kxc5 forced\",\"NOTE 4: Kc4 forced\"]}","created_at":"2026-07-20 18:49:43","_table":"pcp_chess_puzzles"},{"id":335,"puzzle_hash":"255d096e581b575b54dd807a03b398aa9f010ac3c9d0da1ea4f22e8de8be471f","fen":"2B5/4R3/1Pkb3Q/1p1n1pB1/1p1Kp1n1/3b4/4r3/8 b - - 0 1","line_san":"1...Rc2?? 2.Qxd6+!! Kxd6 3.Re6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Rc4#","material_note":"added pb4, pf5; material -2 -> 0; eval +419 -> +513 cp","payload":"{\"puzzle_hash\":\"255d096e581b575b54dd807a03b398aa9f010ac3c9d0da1ea4f22e8de8be471f\",\"fen\":\"2B5/4R3/1Pkb3Q/1p1n1pB1/1p1Kp1n1/3b4/4r3/8 b - - 0 1\",\"line_san\":\"1...Rc2?? 2.Qxd6+!! Kxd6 3.Re6#\",\"generator_seed\":569916387,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -1), ('B', 0, 2), ('K', -1, -2), ('P', 1, 0), ('Q', -5, 0), ('R', -2, 1), ('b', -1, -3), ('b', -1, 0), ('k', 0, 0), ('n', -4, -2), ('n', -1, -1), ('p', -3, -1), ('p', -2, -2), ('p', 1, -2), ('p', 1, -1), ('r', -2, -4))\",\"solution_key\":\"san:Rc2 Qxd6 Kxd6 Re6\",\"answer_key\":\"answer:Qxd6 Kxd6 Re6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Rc4#\",\"threat_uci\":\"c2c4\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers c5, d5 in the mate net.\",\"material_note\":\"added pb4, pf5; material -2 -> 0; eval +419 -> +513 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rc4#\",\"THREAT_UCI: c2c4\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers c5, d5 in the mate net.\",\"MATERIAL: added pb4, pf5; material -2 -> 0; eval +419 -> +513 cp\",\"NOTE 2: Kxd6 forced\"]}","created_at":"2026-07-20 17:12:14","_table":"pcp_chess_puzzles"},{"id":334,"puzzle_hash":"687e297c834b6189779fd785e2d085c9cbdd1b9eab373a9eb331a42fe029bb08","fen":"3n3B/1B5P/2Q3bk/4p3/4pRK1/8/4n1p1/6q1 b - - 0 1","line_san":"1...Qh1?? 2.Qxg6+!! Kxg6 3.Bxe4+ Kh6 4.Rf6#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens g1=R#","material_note":"added nd8, pe5; material -4 -> 0; eval +271 -> +899 cp","payload":"{\"puzzle_hash\":\"687e297c834b6189779fd785e2d085c9cbdd1b9eab373a9eb331a42fe029bb08\",\"fen\":\"3n3B/1B5P/2Q3bk/4p3/4pRK1/8/4n1p1/6q1 b - - 0 1\",\"line_san\":\"1...Qh1?? 2.Qxg6+!! Kxg6 3.Bxe4+ Kh6 4.Rf6#\",\"generator_seed\":4006938993,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -6, -1), ('B', 0, -2), ('K', -1, 2), ('P', 0, -1), ('Q', -5, 0), ('R', -2, 2), ('b', -1, 0), ('k', 0, 0), ('n', -4, -2), ('n', -3, 4), ('p', -3, 1), ('p', -3, 2), ('p', -1, 4), ('q', -1, 5))\",\"solution_key\":\"san:Qh1 Qxg6 Kxg6 Bxe4 Kh6 Rf6\",\"answer_key\":\"answer:Qxg6 Kxg6 Bxe4 Kh6 Rf6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens g1=R#\",\"threat_uci\":\"g2g1r\",\"threat_piece\":\"P=R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers g5, h5 in the mate net.\",\"material_note\":\"added nd8, pe5; material -4 -> 0; eval +271 -> +899 cp\",\"force_notes\":[\"Only Qxg6+ wins; 31 quiet moves allow mate in 1.\",\"1 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxg6 forced\"},{\"ply\":4,\"text\":\"Kh6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens g1=R#\",\"THREAT_UCI: g2g1r\",\"THREAT_PIECE: P=R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers g5, h5 in the mate net.\",\"MATERIAL: added nd8, pe5; material -4 -> 0; eval +271 -> +899 cp\",\"FORCE: Only Qxg6+ wins; 31 quiet moves allow mate in 1.\",\"FORCE: 1 checking tries do not solve the puzzle.\",\"NOTE 2: Kxg6 forced\",\"NOTE 4: Kh6 forced\"]}","created_at":"2026-07-20 17:08:54","_table":"pcp_chess_puzzles"},{"id":333,"puzzle_hash":"489f1d1c58ac5685f6e3acd612c766f5ba8b7790ec7616e757a750e87030b60d","fen":"8/4q3/p3p3/2n1bp2/1BK2kp1/3Pr3/n6R/2Q3N1 b - - 0 1","line_san":"1...Qb7?? 2.Qxe3+!! Kxe3 3.Bd2#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qd5#","material_note":"added na2; material 3 -> 6; eval -325 -> +969 cp","payload":"{\"puzzle_hash\":\"489f1d1c58ac5685f6e3acd612c766f5ba8b7790ec7616e757a750e87030b60d\",\"fen\":\"8/4q3/p3p3/2n1bp2/1BK2kp1/3Pr3/n6R/2Q3N1 b - - 0 1\",\"line_san\":\"1...Qb7?? 2.Qxe3+!! Kxe3 3.Bd2#\",\"generator_seed\":619959916,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, 0), ('K', -3, 0), ('N', 1, -3), ('P', -2, -1), ('Q', -3, -3), ('R', 2, -2), ('b', -1, 1), ('k', 0, 0), ('n', -5, -2), ('n', -3, 1), ('p', -5, 2), ('p', -1, 2), ('p', 0, 1), ('p', 1, 0), ('q', -1, 3), ('r', -1, -1))\",\"solution_key\":\"san:Qb7 Qxe3 Kxe3 Bd2\",\"answer_key\":\"answer:Qxe3 Kxe3 Bd2\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qd5#\",\"threat_uci\":\"b7d5\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added na2; material 3 -> 6; eval -325 -> +969 cp\",\"force_notes\":[\"Only Qxe3+ wins; 31 quiet moves allow mate in 1.\",\"4 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe3 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd5#\",\"THREAT_UCI: b7d5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added na2; material 3 -> 6; eval -325 -> +969 cp\",\"FORCE: Only Qxe3+ wins; 31 quiet moves allow mate in 1.\",\"FORCE: 4 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe3 forced\"]}","created_at":"2026-07-20 09:19:59","_table":"pcp_chess_puzzles"},{"id":332,"puzzle_hash":"c0443c84c097ec8487d670c26036761ee4dd29f320cca5c10ce88429ec079a9f","fen":"8/8/7Q/r3P3/r1Bp1K1n/b3R1Nk/6bP/3n4 b - - 0 1","line_san":"1...Bc1?? 2.Qxh4+!! Kxh4 3.Nf5+ Kh5 4.Bf7#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Bxe3#","material_note":"added ra4, nd1; material -7 -> 1; eval -476 -> +498 cp","payload":"{\"puzzle_hash\":\"c0443c84c097ec8487d670c26036761ee4dd29f320cca5c10ce88429ec079a9f\",\"fen\":\"8/8/7Q/r3P3/r1Bp1K1n/b3R1Nk/6bP/3n4 b - - 0 1\",\"line_san\":\"1...Bc1?? 2.Qxh4+!! Kxh4 3.Nf5+ Kh5 4.Bf7#\",\"generator_seed\":2792382611,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -5, -1), ('K', -2, -1), ('N', -1, 0), ('P', -3, -2), ('P', 0, 1), ('Q', 0, -3), ('R', -3, 0), ('b', -7, 0), ('b', -1, 1), ('k', 0, 0), ('n', -4, 2), ('n', 0, -1), ('p', -4, -1), ('r', -7, -2), ('r', -7, -1))\",\"solution_key\":\"san:Bc1 Qxh4 Kxh4 Nf5 Kh5 Bf7\",\"answer_key\":\"answer:Qxh4 Kxh4 Nf5 Kh5 Bf7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Bxe3#\",\"threat_uci\":\"c1e3\",\"threat_piece\":\"B\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers g3, g4 in the mate net.\",\"material_note\":\"added ra4, nd1; material -7 -> 1; eval -476 -> +498 cp\",\"force_notes\":[\"Only Qxh4+ meets the threat cleanly; 23 quiet moves still lose immediately.\",\"Non-direct tries checked: Kg5.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxh4 forced\"},{\"ply\":4,\"text\":\"Kh5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Bxe3#\",\"THREAT_UCI: c1e3\",\"THREAT_PIECE: B\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers g3, g4 in the mate net.\",\"MATERIAL: added ra4, nd1; material -7 -> 1; eval -476 -> +498 cp\",\"FORCE: Only Qxh4+ meets the threat cleanly; 23 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Kg5.\",\"NOTE 2: Kxh4 forced\",\"NOTE 4: Kh5 forced\"]}","created_at":"2026-07-20 09:17:46","_table":"pcp_chess_puzzles"},{"id":331,"puzzle_hash":"9459d6c36de058782fac5f88ad0772af3892659dec68de6d61d41b42bec5a4de","fen":"2N1Q3/4R3/2r1p3/pk5B/1p1PK3/1r2n3/q1n5/8 b - - 0 1","line_san":"1...Nd5?? 2.Qxc6+!! Kxc6 3.Be8#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Re3#","material_note":"added qa2; material -2 -> 7; eval -392 -> +513 cp","payload":"{\"puzzle_hash\":\"9459d6c36de058782fac5f88ad0772af3892659dec68de6d61d41b42bec5a4de\",\"fen\":\"2N1Q3/4R3/2r1p3/pk5B/1p1PK3/1r2n3/q1n5/8 b - - 0 1\",\"line_san\":\"1...Nd5?? 2.Qxc6+!! Kxc6 3.Be8#\",\"generator_seed\":4201707400,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -6, 0), ('K', -3, -1), ('N', -1, 3), ('P', -2, -1), ('Q', -3, 3), ('R', -3, 2), ('k', 0, 0), ('n', -3, -2), ('n', -1, -3), ('p', -3, 1), ('p', 0, -1), ('p', 1, 0), ('q', 1, -3), ('r', -1, 1), ('r', 0, -2))\",\"solution_key\":\"san:Nd5 Qxc6 Kxc6 Be8\",\"answer_key\":\"answer:Qxc6 Kxc6 Be8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Re3#\",\"threat_uci\":\"b3e3\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added qa2; material -2 -> 7; eval -392 -> +513 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Re3#\",\"THREAT_UCI: b3e3\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added qa2; material -2 -> 7; eval -392 -> +513 cp\",\"NOTE 2: Kxc6 forced\"]}","created_at":"2026-07-20 09:09:41","_table":"pcp_chess_puzzles"},{"id":330,"puzzle_hash":"250ca0e241e201ecc0897630e1037d52e9783dc1195dbc359244fcb6b9055cb9","fen":"5R2/4Q3/8/n5b1/r1p5/8/1PKPb3/r1n1kN1B b - - 0 1","line_san":"1...Nd3?? 2.Qxe2+!! Kxe2 3.Ng3+ Ke1 4.Rf1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rc1#","material_note":"added pc4, ra4; material -5 -> 1; eval +521 -> +884 cp","payload":"{\"puzzle_hash\":\"250ca0e241e201ecc0897630e1037d52e9783dc1195dbc359244fcb6b9055cb9\",\"fen\":\"5R2/4Q3/8/n5b1/r1p5/8/1PKPb3/r1n1kN1B b - - 0 1\",\"line_san\":\"1...Nd3?? 2.Qxe2+!! Kxe2 3.Ng3+ Ke1 4.Rf1#\",\"generator_seed\":52708186,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, 0), ('K', 2, -1), ('N', -1, 0), ('P', 1, -1), ('P', 3, -1), ('Q', 0, -6), ('R', -1, -7), ('b', -2, -4), ('b', 0, -1), ('k', 0, 0), ('n', 2, 0), ('n', 4, -4), ('p', 2, -3), ('r', 4, -3), ('r', 4, 0))\",\"solution_key\":\"san:Nd3 Qxe2 Kxe2 Ng3 Ke1 Rf1\",\"answer_key\":\"answer:Qxe2 Kxe2 Ng3 Ke1 Rf1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rc1#\",\"threat_uci\":\"a1c1\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d1, d2 in the mate net.\",\"material_note\":\"added pc4, ra4; material -5 -> 1; eval +521 -> +884 cp\",\"force_notes\":[\"Only Qxe2+ meets the threat cleanly; 44 quiet moves still lose immediately.\",\"Non-direct tries checked: Kc3.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe2 forced\"},{\"ply\":4,\"text\":\"Ke1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rc1#\",\"THREAT_UCI: a1c1\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d1, d2 in the mate net.\",\"MATERIAL: added pc4, ra4; material -5 -> 1; eval +521 -> +884 cp\",\"FORCE: Only Qxe2+ meets the threat cleanly; 44 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Kc3.\",\"NOTE 2: Kxe2 forced\",\"NOTE 4: Ke1 forced\"]}","created_at":"2026-07-20 08:48:22","_table":"pcp_chess_puzzles"},{"id":329,"puzzle_hash":"de5de2fdba0fde0104235b2251c3a1b3ee34c5c5f161a587c9d09659d6b76a81","fen":"Q2bk3/1p3b1q/1NPK2p1/4B1r1/8/1n1n4/4R3/8 b - - 0 1","line_san":"1...Qh3?? 2.Qxd8+!! Kxd8 3.Bf6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qe6#","material_note":"added rg5, nd3; material -1 -> 7; eval -483 -> +328 cp","payload":"{\"puzzle_hash\":\"de5de2fdba0fde0104235b2251c3a1b3ee34c5c5f161a587c9d09659d6b76a81\",\"fen\":\"Q2bk3/1p3b1q/1NPK2p1/4B1r1/8/1n1n4/4R3/8 b - - 0 1\",\"line_san\":\"1...Qh3?? 2.Qxd8+!! Kxd8 3.Bf6#\",\"generator_seed\":1782749117,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, 0), ('K', -2, -1), ('N', -2, -3), ('P', -2, -2), ('Q', 0, -4), ('R', -6, 0), ('b', -1, 1), ('b', 0, -1), ('k', 0, 0), ('n', -5, -3), ('n', -5, -1), ('p', -2, 2), ('p', -1, -3), ('q', -1, 3), ('r', -3, 2))\",\"solution_key\":\"san:Qh3 Qxd8 Kxd8 Bf6\",\"answer_key\":\"answer:Qxd8 Kxd8 Bf6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qe6#\",\"threat_uci\":\"h3e6\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d7, e7 in the mate net.\",\"material_note\":\"added rg5, nd3; material -1 -> 7; eval -483 -> +328 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd8 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qe6#\",\"THREAT_UCI: h3e6\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d7, e7 in the mate net.\",\"MATERIAL: added rg5, nd3; material -1 -> 7; eval -483 -> +328 cp\",\"NOTE 2: Kxd8 forced\"]}","created_at":"2026-07-20 05:50:21","_table":"pcp_chess_puzzles"},{"id":328,"puzzle_hash":"3b5f8c1060719ab9c5264a37577b8347d8bced096f194c67df6584ccbec80a00","fen":"8/8/8/1r2p3/1rn2b2/1pKnB3/4kP1R/Q6B b - - 0 1","line_san":"1...Nb6?? 2.Qd1+!! Kxd1 3.Bf3+ Ke1 4.Rh1#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rc4#","material_note":null,"payload":"{\"puzzle_hash\":\"3b5f8c1060719ab9c5264a37577b8347d8bced096f194c67df6584ccbec80a00\",\"fen\":\"8/8/8/1r2p3/1rn2b2/1pKnB3/4kP1R/Q6B b - - 0 1\",\"line_san\":\"1...Nb6?? 2.Qd1+!! Kxd1 3.Bf3+ Ke1 4.Rh1#\",\"generator_seed\":861213374,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -1), ('B', 0, 1), ('K', 2, 1), ('P', -1, 0), ('Q', 4, -1), ('R', -3, 0), ('b', -1, 2), ('k', 0, 0), ('n', 1, 1), ('n', 2, 2), ('p', 0, 3), ('p', 3, 1), ('r', 3, 2), ('r', 3, 3))\",\"solution_key\":\"san:Nb6 Qd1 Kxd1 Bf3 Ke1 Rh1\",\"answer_key\":\"answer:Qd1 Kxd1 Bf3 Ke1 Rh1\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rc4#\",\"threat_uci\":\"b4c4\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d2, d3 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qd1+ wins; 28 quiet moves allow mate in 1.\",\"6 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd1 forced\"},{\"ply\":4,\"text\":\"Ke1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rc4#\",\"THREAT_UCI: b4c4\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d2, d3 in the mate net.\",\"FORCE: Only Qd1+ wins; 28 quiet moves allow mate in 1.\",\"FORCE: 6 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd1 forced\",\"NOTE 4: Ke1 forced\"]}","created_at":"2026-07-20 05:13:26","_table":"pcp_chess_puzzles"},{"id":327,"puzzle_hash":"1f4784eb9a1ab6bb47ddec09d06b27da1078d4823e0dcd6c473d361228e29753","fen":"3B4/8/2RQ4/1p2r3/1p2Bkp1/n2Kn3/3brq2/8 b - - 0 1","line_san":"1...Ng2?? 2.Qxe5+!! Kxe5 3.Bc7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Ne1#","material_note":null,"payload":"{\"puzzle_hash\":\"1f4784eb9a1ab6bb47ddec09d06b27da1078d4823e0dcd6c473d361228e29753\",\"fen\":\"3B4/8/2RQ4/1p2r3/1p2Bkp1/n2Kn3/3brq2/8 b - - 0 1\",\"line_san\":\"1...Ng2?? 2.Qxe5+!! Kxe5 3.Bc7#\",\"generator_seed\":3065559533,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', 0, -1), ('K', 1, -2), ('Q', -2, -2), ('R', -2, -3), ('b', 2, -2), ('k', 0, 0), ('n', 1, -5), ('n', 1, -1), ('p', -1, -4), ('p', 0, -4), ('p', 0, 1), ('q', 2, 0), ('r', -1, -1), ('r', 2, -1))\",\"solution_key\":\"san:Ng2 Qxe5 Kxe5 Bc7\",\"answer_key\":\"answer:Qxe5 Kxe5 Bc7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Ne1#\",\"threat_uci\":\"g2e1\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e3, e4 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxe5+ wins; 31 quiet moves allow mate in 1.\",\"4 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ne1#\",\"THREAT_UCI: g2e1\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e3, e4 in the mate net.\",\"FORCE: Only Qxe5+ wins; 31 quiet moves allow mate in 1.\",\"FORCE: 4 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe5 forced\"]}","created_at":"2026-07-20 05:04:07","_table":"pcp_chess_puzzles"},{"id":326,"puzzle_hash":"1fa010b77542afffa03aa756c70b9dbcc17c9e780e7c9399002430c111744568","fen":"8/8/6B1/5QR1/1p6/1b5p/2pK1bP1/Bqn2k2 b - - 0 1","line_san":"1...Na2?? 2.Qxf2+!! Kxf2 3.Bd4+ Kf1 4.Bd3#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qd1#","material_note":"added ph3, pb4; material -2 -> 0; eval +575 -> +824 cp","payload":"{\"puzzle_hash\":\"1fa010b77542afffa03aa756c70b9dbcc17c9e780e7c9399002430c111744568\",\"fen\":\"8/8/6B1/5QR1/1p6/1b5p/2pK1bP1/Bqn2k2 b - - 0 1\",\"line_san\":\"1...Na2?? 2.Qxf2+!! Kxf2 3.Bd4+ Kf1 4.Bd3#\",\"generator_seed\":1729545526,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -5, -1), ('B', 0, 5), ('K', -1, 2), ('P', -1, -1), ('Q', -4, 0), ('R', -4, -1), ('b', -2, 4), ('b', -1, 0), ('k', 0, 0), ('n', 0, 3), ('p', -3, 4), ('p', -2, -2), ('p', -1, 3), ('q', 0, 4))\",\"solution_key\":\"san:Na2 Qxf2 Kxf2 Bd4 Kf1 Bd3\",\"answer_key\":\"answer:Qxf2 Kxf2 Bd4 Kf1 Bd3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qd1#\",\"threat_uci\":\"b1d1\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e1, e2 in the mate net.\",\"material_note\":\"added ph3, pb4; material -2 -> 0; eval +575 -> +824 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf2 forced\"},{\"ply\":4,\"text\":\"Kf1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qd1#\",\"THREAT_UCI: b1d1\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e1, e2 in the mate net.\",\"MATERIAL: added ph3, pb4; material -2 -> 0; eval +575 -> +824 cp\",\"NOTE 2: Kxf2 forced\",\"NOTE 4: Kf1 forced\"]}","created_at":"2026-07-20 05:00:13","_table":"pcp_chess_puzzles"},{"id":325,"puzzle_hash":"d9bca40f0b52cb379098c0f412384fc5fe24e6801951481c38d459cadb2de932","fen":"R7/2Qp4/1B1Pkb1q/1pK1p3/1rnP4/8/2n1B3/8 b - - 0 1","line_san":"1...Qe3?? 2.Qxd7+!! Kxd7 3.Bg4#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxd4#","material_note":null,"payload":"{\"puzzle_hash\":\"d9bca40f0b52cb379098c0f412384fc5fe24e6801951481c38d459cadb2de932\",\"fen\":\"R7/2Qp4/1B1Pkb1q/1pK1p3/1rnP4/8/2n1B3/8 b - - 0 1\",\"line_san\":\"1...Qe3?? 2.Qxd7+!! Kxd7 3.Bg4#\",\"generator_seed\":3107240737,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, 0), ('B', 0, -3), ('K', -1, -2), ('P', -2, -1), ('P', 0, -1), ('Q', 1, -2), ('R', 2, -4), ('b', 0, 1), ('k', 0, 0), ('n', -4, -2), ('n', -2, -2), ('p', -1, -3), ('p', -1, 0), ('p', 1, -1), ('q', 0, 3), ('r', -2, -3))\",\"solution_key\":\"san:Qe3 Qxd7 Kxd7 Bg4\",\"answer_key\":\"answer:Qxd7 Kxd7 Bg4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxd4#\",\"threat_uci\":\"e3d4\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers d5, d6 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxd7+ wins; 26 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd7 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxd4#\",\"THREAT_UCI: e3d4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers d5, d6 in the mate net.\",\"FORCE: Only Qxd7+ wins; 26 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd7 forced\"]}","created_at":"2026-07-20 03:31:10","_table":"pcp_chess_puzzles"},{"id":324,"puzzle_hash":"eb01f999a0d2ca5c4163f3138b951d2abed50b298dda8b0259811e30380f15c0","fen":"1n1q4/8/3B4/5p2/3p4/4pKpp/1pP1Q2b/2kn1NR1 b - - 0 1","line_san":"1...Qh4?? 2.Qxd1+!! Kxd1 3.Nxe3+ Kd2 4.Bb4#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qg4#","material_note":null,"payload":"{\"puzzle_hash\":\"eb01f999a0d2ca5c4163f3138b951d2abed50b298dda8b0259811e30380f15c0\",\"fen\":\"1n1q4/8/3B4/5p2/3p4/4pKpp/1pP1Q2b/2kn1NR1 b - - 0 1\",\"line_san\":\"1...Qh4?? 2.Qxd1+!! Kxd1 3.Nxe3+ Kd2 4.Bb4#\",\"generator_seed\":1061731084,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -5, -1), ('K', -2, -3), ('N', 0, -3), ('P', -1, 0), ('Q', -1, -2), ('R', 0, -4), ('b', -1, -5), ('k', 0, 0), ('n', -7, 1), ('n', 0, -1), ('p', -4, -3), ('p', -3, -1), ('p', -2, -5), ('p', -2, -4), ('p', -2, -2), ('p', -1, 1), ('q', -7, -1))\",\"solution_key\":\"san:Qh4 Qxd1 Kxd1 Nxe3 Kd2 Bb4\",\"answer_key\":\"answer:Qxd1 Kxd1 Nxe3 Kd2 Bb4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qg4#\",\"threat_uci\":\"h4g4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":null,\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd1 forced\"},{\"ply\":4,\"text\":\"Kd2 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qg4#\",\"THREAT_UCI: h4g4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"NOTE 2: Kxd1 forced\",\"NOTE 4: Kd2 forced\"]}","created_at":"2026-07-20 03:29:43","_table":"pcp_chess_puzzles"},{"id":323,"puzzle_hash":"5d794ef69dbaa8acd4e8f8852952f5832b344eb80e576aec88db055a99fee517","fen":"2N1n1Q1/1R6/1P1Pr3/1bK1k1B1/2PpP3/n7/8/3q1r2 b - - 0 1","line_san":"1...Qb3?? 2.Qxe6+!! Kxe6 3.Re7#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qxc4#","material_note":"added rf1, na3, ne8; material -6 -> 5; eval -687 -> +247 cp","payload":"{\"puzzle_hash\":\"5d794ef69dbaa8acd4e8f8852952f5832b344eb80e576aec88db055a99fee517\",\"fen\":\"2N1n1Q1/1R6/1P1Pr3/1bK1k1B1/2PpP3/n7/8/3q1r2 b - - 0 1\",\"line_san\":\"1...Qb3?? 2.Qxe6+!! Kxe6 3.Re7#\",\"generator_seed\":653967002,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -2, 0), ('K', 2, 0), ('N', 2, -3), ('P', 0, 1), ('P', 1, -1), ('P', 2, 1), ('P', 3, -1), ('Q', -2, -3), ('R', 3, -2), ('b', 3, 0), ('k', 0, 0), ('n', 0, -3), ('n', 4, 2), ('p', 1, 1), ('q', 1, 4), ('r', -1, 4), ('r', 0, -1))\",\"solution_key\":\"san:Qb3 Qxe6 Kxe6 Re7\",\"answer_key\":\"answer:Qxe6 Kxe6 Re7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qxc4#\",\"threat_uci\":\"b3c4\",\"threat_piece\":\"Q\",\"threat_type\":\"floating-capture\",\"king_note\":\"Black king covers d4, d5, d6 in the mate net.\",\"material_note\":\"added rf1, na3, ne8; material -6 -> 5; eval -687 -> +247 cp\",\"force_notes\":[\"Only Qxe6+ wins; 24 quiet moves allow mate in 1.\",\"4 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qxc4#\",\"THREAT_UCI: b3c4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: floating-capture\",\"KING: Black king covers d4, d5, d6 in the mate net.\",\"MATERIAL: added rf1, na3, ne8; material -6 -> 5; eval -687 -> +247 cp\",\"FORCE: Only Qxe6+ wins; 24 quiet moves allow mate in 1.\",\"FORCE: 4 checking tries do not solve the puzzle.\",\"NOTE 2: Kxe6 forced\"]}","created_at":"2026-07-20 03:00:44","_table":"pcp_chess_puzzles"},{"id":322,"puzzle_hash":"9052b9c7758ccb529fa3e56e39c660b8435924cd43281bd0793f08265acbb21c","fen":"1bk5/1N1b4/5K2/1P1Qpn2/2B5/2R2n2/1r6/4rq2 b - - 0 1","line_san":"1...Qg2?? 2.Qxd7+!! Kxd7 3.Be6+ Ke8 4.Rc8#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qg7#","material_note":"added rb2; material 6 -> 11; eval -307 -> +153 cp","payload":"{\"puzzle_hash\":\"9052b9c7758ccb529fa3e56e39c660b8435924cd43281bd0793f08265acbb21c\",\"fen\":\"1bk5/1N1b4/5K2/1P1Qpn2/2B5/2R2n2/1r6/4rq2 b - - 0 1\",\"line_san\":\"1...Qg2?? 2.Qxd7+!! Kxd7 3.Be6+ Ke8 4.Rc8#\",\"generator_seed\":741365722,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, 0), ('K', -2, -3), ('N', -1, 1), ('P', -3, 1), ('Q', -3, -1), ('R', -5, 0), ('b', -1, -1), ('b', 0, 1), ('k', 0, 0), ('n', -5, -3), ('n', -3, -3), ('p', -3, -2), ('q', -7, -3), ('r', -7, -2), ('r', -6, 1))\",\"solution_key\":\"san:Qg2 Qxd7 Kxd7 Be6 Ke8 Rc8\",\"answer_key\":\"answer:Qxd7 Kxd7 Be6 Ke8 Rc8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qg7#\",\"threat_uci\":\"g2g7\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added rb2; material 6 -> 11; eval -307 -> +153 cp\",\"force_notes\":[\"Only Qxd7+ meets the threat cleanly; 21 quiet moves still lose immediately.\",\"Non-direct tries checked: Qe6.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd7 forced\"},{\"ply\":4,\"text\":\"Ke8 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qg7#\",\"THREAT_UCI: g2g7\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added rb2; material 6 -> 11; eval -307 -> +153 cp\",\"FORCE: Only Qxd7+ meets the threat cleanly; 21 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Qe6.\",\"NOTE 2: Kxd7 forced\",\"NOTE 4: Ke8 forced\"]}","created_at":"2026-07-20 02:54:43","_table":"pcp_chess_puzzles"},{"id":321,"puzzle_hash":"cf292f09cec0627062fca862f501e3b44524e1468adcf31a71502f01e5cae736","fen":"1RQ5/1B2p1p1/4p1r1/p3Kpp1/2b5/B2kp1n1/1P1p4/6b1 b - - 0 1","line_san":"1...Bh2?? 2.Qxc4+!! Kxc4 3.Ba6#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Ne2#","material_note":"added pa5, pe7, pg7; material -2 -> 1; eval +90 -> +103 cp","payload":"{\"puzzle_hash\":\"cf292f09cec0627062fca862f501e3b44524e1468adcf31a71502f01e5cae736\",\"fen\":\"1RQ5/1B2p1p1/4p1r1/p3Kpp1/2b5/B2kp1n1/1P1p4/6b1 b - - 0 1\",\"line_san\":\"1...Bh2?? 2.Qxc4+!! Kxc4 3.Ba6#\",\"generator_seed\":3277087942,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', 0, -3), ('K', -2, 1), ('P', 1, -2), ('Q', -5, -1), ('R', -5, -2), ('b', -1, -1), ('b', 2, 3), ('k', 0, 0), ('n', 0, 3), ('p', -4, 1), ('p', -4, 3), ('p', -3, 1), ('p', -2, -3), ('p', -2, 2), ('p', -2, 3), ('p', 0, 1), ('p', 1, 0), ('r', -3, 3))\",\"solution_key\":\"san:Bh2 Qxc4 Kxc4 Ba6\",\"answer_key\":\"answer:Qxc4 Kxc4 Ba6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Ne2#\",\"threat_uci\":\"g3e2\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d4, e4 in the mate net.\",\"material_note\":\"added pa5, pe7, pg7; material -2 -> 1; eval +90 -> +103 cp\",\"force_notes\":[\"Only Qxc4+ wins; 22 quiet moves allow mate in 1.\",\"3 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ne2#\",\"THREAT_UCI: g3e2\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d4, e4 in the mate net.\",\"MATERIAL: added pa5, pe7, pg7; material -2 -> 1; eval +90 -> +103 cp\",\"FORCE: Only Qxc4+ wins; 22 quiet moves allow mate in 1.\",\"FORCE: 3 checking tries do not solve the puzzle.\",\"NOTE 2: Kxc4 forced\"]}","created_at":"2026-07-20 02:05:34","_table":"pcp_chess_puzzles"},{"id":320,"puzzle_hash":"a0e11e96de0857237427ac3970ec5c81e141dd0b951bb68fcd612936713c1cff","fen":"3R4/1p6/pk2pBn1/2b4Q/B3KP2/2P1n1r1/8/6r1 b - - 0 1","line_san":"1...Ng4?? 2.Qxc5+!! Kxc5 3.Bd4+ Kc4 4.Rc8#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Re3#","material_note":"added rg1; material -5 -> 0; eval +153 -> +548 cp","payload":"{\"puzzle_hash\":\"a0e11e96de0857237427ac3970ec5c81e141dd0b951bb68fcd612936713c1cff\",\"fen\":\"3R4/1p6/pk2pBn1/2b4Q/B3KP2/2P1n1r1/8/6r1 b - - 0 1\",\"line_san\":\"1...Ng4?? 2.Qxc5+!! Kxc5 3.Bd4+ Kc4 4.Rc8#\",\"generator_seed\":4062617832,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -4, 0), ('B', 1, -2), ('K', -3, -2), ('P', -4, -2), ('P', -1, -3), ('Q', -6, -1), ('R', -2, 2), ('b', -1, -1), ('k', 0, 0), ('n', -5, 0), ('n', -3, -3), ('p', -3, 0), ('p', 0, 1), ('p', 1, 0), ('r', -5, -5), ('r', -5, -3))\",\"solution_key\":\"san:Ng4 Qxc5 Kxc5 Bd4 Kc4 Rc8\",\"answer_key\":\"answer:Qxc5 Kxc5 Bd4 Kc4 Rc8\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Re3#\",\"threat_uci\":\"g3e3\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":\"added rg1; material -5 -> 0; eval +153 -> +548 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc5 forced\"},{\"ply\":4,\"text\":\"Kc4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Re3#\",\"THREAT_UCI: g3e3\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"MATERIAL: added rg1; material -5 -> 0; eval +153 -> +548 cp\",\"NOTE 2: Kxc5 forced\",\"NOTE 4: Kc4 forced\"]}","created_at":"2026-07-20 01:27:46","_table":"pcp_chess_puzzles"},{"id":319,"puzzle_hash":"de45cc290fa79ea697146ca01bc2f1bdcdb7a1fe73610abeab12321939aa3399","fen":"2r5/1R6/7Q/3r1n1p/1Bp5/2Kn4/b1P1B3/1k6 b - - 0 1","line_san":"1...Nc5?? 2.Qc1+!! Kxc1 3.Ba3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Ne4#","material_note":"added rc8, nf5; material -8 -> 0; eval -797 -> +265 cp","payload":"{\"puzzle_hash\":\"de45cc290fa79ea697146ca01bc2f1bdcdb7a1fe73610abeab12321939aa3399\",\"fen\":\"2r5/1R6/7Q/3r1n1p/1Bp5/2Kn4/b1P1B3/1k6 b - - 0 1\",\"line_san\":\"1...Nc5?? 2.Qc1+!! Kxc1 3.Ba3#\",\"generator_seed\":1274535132,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -3, -1), ('B', 0, -3), ('K', -1, -2), ('P', -1, -1), ('Q', -6, -5), ('R', 0, -6), ('b', 1, -1), ('k', 0, 0), ('n', -4, -4), ('n', -2, -2), ('p', -6, -4), ('p', -1, -3), ('r', -2, -4), ('r', -1, -7))\",\"solution_key\":\"san:Nc5 Qc1 Kxc1 Ba3\",\"answer_key\":\"answer:Qc1 Kxc1 Ba3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Ne4#\",\"threat_uci\":\"c5e4\",\"threat_piece\":\"N\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers b2, c2 in the mate net.\",\"material_note\":\"added rc8, nf5; material -8 -> 0; eval -797 -> +265 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Ne4#\",\"THREAT_UCI: c5e4\",\"THREAT_PIECE: N\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers b2, c2 in the mate net.\",\"MATERIAL: added rc8, nf5; material -8 -> 0; eval -797 -> +265 cp\",\"NOTE 2: Kxc1 forced\"]}","created_at":"2026-07-19 23:45:59","_table":"pcp_chess_puzzles"},{"id":318,"puzzle_hash":"82d4aeaaea9c7e1e6d8bda219563df8fbf72c0699f50487a65f06d864d06266d","fen":"q7/6b1/8/1n1p1p2/8/1N1K4/3P3B/1Q1nkN2 b - - 0 1","line_san":"1...Qa4?? 2.Qxd1+!! Kxd1 3.Ne3+ Ke1 4.Bg3#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qe4#","material_note":"added bg7, pf5; material -3 -> 1; eval -10 -> +100 cp","payload":"{\"puzzle_hash\":\"82d4aeaaea9c7e1e6d8bda219563df8fbf72c0699f50487a65f06d864d06266d\",\"fen\":\"q7/6b1/8/1n1p1p2/8/1N1K4/3P3B/1Q1nkN2 b - - 0 1\",\"line_san\":\"1...Qa4?? 2.Qxd1+!! Kxd1 3.Ne3+ Ke1 4.Bg3#\",\"generator_seed\":405087420,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -1), ('K', 1, -2), ('N', -1, 0), ('N', 3, -2), ('P', 1, -1), ('Q', 3, 0), ('b', -2, -6), ('k', 0, 0), ('n', 1, 0), ('n', 3, -4), ('p', -1, -4), ('p', 1, -4), ('q', 4, -7))\",\"solution_key\":\"san:Qa4 Qxd1 Kxd1 Ne3 Ke1 Bg3\",\"answer_key\":\"answer:Qxd1 Kxd1 Ne3 Ke1 Bg3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qe4#\",\"threat_uci\":\"a4e4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d2, e2 in the mate net.\",\"material_note\":\"added bg7, pf5; material -3 -> 1; eval -10 -> +100 cp\",\"force_notes\":[\"Only Qxd1+ wins; 19 quiet moves allow mate in 1.\",\"1 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"If Kf2, Qe2#\"},{\"ply\":4,\"text\":\"Ke1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qe4#\",\"THREAT_UCI: a4e4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d2, e2 in the mate net.\",\"MATERIAL: added bg7, pf5; material -3 -> 1; eval -10 -> +100 cp\",\"FORCE: Only Qxd1+ wins; 19 quiet moves allow mate in 1.\",\"FORCE: 1 checking tries do not solve the puzzle.\",\"NOTE 2: If Kf2, Qe2#\",\"NOTE 4: Ke1 forced\"]}","created_at":"2026-07-19 23:42:21","_table":"pcp_chess_puzzles"},{"id":317,"puzzle_hash":"8dcdfa299fcb9cb2531380981789edddf93da679099878c6d47259ba683f2f60","fen":"8/8/2q1B3/2p5/4n3/3nK3/1R3Bkp/4Qb2 b - - 0 1","line_san":"1...Qd6?? 2.Qxf1+!! Kxf1 3.Bh3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qf4#","material_note":null,"payload":"{\"puzzle_hash\":\"8dcdfa299fcb9cb2531380981789edddf93da679099878c6d47259ba683f2f60\",\"fen\":\"8/8/2q1B3/2p5/4n3/3nK3/1R3Bkp/4Qb2 b - - 0 1\",\"line_san\":\"1...Qd6?? 2.Qxf1+!! Kxf1 3.Bh3#\",\"generator_seed\":648585274,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('B', 0, -1), ('K', -1, -2), ('Q', 1, -2), ('R', 0, -5), ('b', 1, -1), ('k', 0, 0), ('n', -2, -2), ('n', -1, -3), ('p', -3, -4), ('p', 0, 1), ('q', -4, -4))\",\"solution_key\":\"san:Qd6 Qxf1 Kxf1 Bh3\",\"answer_key\":\"answer:Qxf1 Kxf1 Bh3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qf4#\",\"threat_uci\":\"d6f4\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers f2, f3 in the mate net.\",\"material_note\":null,\"force_notes\":[\"Only Qxf1+ wins; 31 quiet moves allow mate in 1.\",\"4 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf1 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qf4#\",\"THREAT_UCI: d6f4\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers f2, f3 in the mate net.\",\"FORCE: Only Qxf1+ wins; 31 quiet moves allow mate in 1.\",\"FORCE: 4 checking tries do not solve the puzzle.\",\"NOTE 2: Kxf1 forced\"]}","created_at":"2026-07-19 18:24:45","_table":"pcp_chess_puzzles"},{"id":316,"puzzle_hash":"8e5cbded2f798f40d1ca7de956325e6a08bda13d55fda1c97a47e1d8af6ad328","fen":"6b1/5BR1/2n3Q1/2kNP3/4Kp2/4n3/7r/2b2r2 b - - 0 1","line_san":"1...Rd2?? 2.Qxc6+!! Kxc6 3.Be8+ Kc5 4.Rc7#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Rd4#","material_note":"added bg8; material -1 -> 2; eval -180 -> +323 cp","payload":"{\"puzzle_hash\":\"8e5cbded2f798f40d1ca7de956325e6a08bda13d55fda1c97a47e1d8af6ad328\",\"fen\":\"6b1/5BR1/2n3Q1/2kNP3/4Kp2/4n3/7r/2b2r2 b - - 0 1\",\"line_san\":\"1...Rd2?? 2.Qxc6+!! Kxc6 3.Be8+ Kc5 4.Rc7#\",\"generator_seed\":4096954742,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -3, -2), ('K', -2, 1), ('N', -1, 0), ('P', -2, 0), ('Q', -4, -1), ('R', -4, -2), ('b', -4, -3), ('b', 0, 4), ('k', 0, 0), ('n', -2, 2), ('n', 0, -1), ('p', -3, 1), ('r', -5, 3), ('r', -3, 4))\",\"solution_key\":\"san:Rd2 Qxc6 Kxc6 Be8 Kc5 Rc7\",\"answer_key\":\"answer:Qxc6 Kxc6 Be8 Kc5 Rc7\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Rd4#\",\"threat_uci\":\"d2d4\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d4, d5 in the mate net.\",\"material_note\":\"added bg8; material -1 -> 2; eval -180 -> +323 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxc6 forced\"},{\"ply\":4,\"text\":\"Kc5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rd4#\",\"THREAT_UCI: d2d4\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d4, d5 in the mate net.\",\"MATERIAL: added bg8; material -1 -> 2; eval -180 -> +323 cp\",\"NOTE 2: Kxc6 forced\",\"NOTE 4: Kc5 forced\"]}","created_at":"2026-07-19 18:15:26","_table":"pcp_chess_puzzles"},{"id":315,"puzzle_hash":"f7f58ca13b7cb935bec86e861754dbb50bf4ab719ee2b70c04c4dfb96f3f0cae","fen":"8/5p2/rpKn1k1q/1p1Pb3/6R1/2n3N1/1r1BQ3/8 b - - 0 1","line_san":"1...Qf8?? 2.Qxe5+!! Kxe5 3.Bxc3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Qc8#","material_note":null,"payload":"{\"puzzle_hash\":\"f7f58ca13b7cb935bec86e861754dbb50bf4ab719ee2b70c04c4dfb96f3f0cae\",\"fen\":\"8/5p2/rpKn1k1q/1p1Pb3/6R1/2n3N1/1r1BQ3/8 b - - 0 1\",\"line_san\":\"1...Qf8?? 2.Qxe5+!! Kxe5 3.Bxc3#\",\"generator_seed\":1727372584,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -4, -2), ('K', 0, -3), ('N', -3, 1), ('P', -1, -2), ('Q', -4, -1), ('R', -2, 1), ('b', -1, -1), ('k', 0, 0), ('n', -3, -3), ('n', 0, -2), ('p', -1, -4), ('p', 0, -4), ('p', 1, 0), ('q', 0, 2), ('r', -4, -4), ('r', 0, -5))\",\"solution_key\":\"san:Qf8 Qxe5 Kxe5 Bxc3\",\"answer_key\":\"answer:Qxe5 Kxe5 Bxc3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Qc8#\",\"threat_uci\":\"f8c8\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":null,\"material_note\":null,\"force_notes\":[\"Only Qxe5+ meets the threat cleanly; 28 quiet moves still lose immediately.\",\"Non-direct tries checked: Rg8.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe5 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qc8#\",\"THREAT_UCI: f8c8\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"FORCE: Only Qxe5+ meets the threat cleanly; 28 quiet moves still lose immediately.\",\"FORCE: Non-direct tries checked: Rg8.\",\"NOTE 2: Kxe5 forced\"]}","created_at":"2026-07-18 00:05:47","_table":"pcp_chess_puzzles"},{"id":314,"puzzle_hash":"f9250f97851fdeb5a66b79232e21035bf83bee76f65f6fe4023269e2d976c587","fen":"7b/qr2n3/2p1Kp1n/1Bk5/1pPr4/5R2/3N4/6Q1 b - - 0 1","line_san":"1...Nc8?? 2.Qxd4+!! Kxd4 3.Nb3+ Ke4 4.Bxc6#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Re7#","material_note":"added qa7; material 1 -> 10; eval -381 -> +521 cp","payload":"{\"puzzle_hash\":\"f9250f97851fdeb5a66b79232e21035bf83bee76f65f6fe4023269e2d976c587\",\"fen\":\"7b/qr2n3/2p1Kp1n/1Bk5/1pPr4/5R2/3N4/6Q1 b - - 0 1\",\"line_san\":\"1...Nc8?? 2.Qxd4+!! Kxd4 3.Nb3+ Ke4 4.Bxc6#\",\"generator_seed\":2386469179,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -1, 0), ('K', 2, -1), ('N', 1, 3), ('P', 0, 1), ('Q', 4, 4), ('R', 3, 2), ('b', 5, -3), ('k', 0, 0), ('n', 2, -2), ('n', 5, -1), ('p', -1, 1), ('p', 0, -1), ('p', 3, -1), ('q', -2, -2), ('r', -1, -2), ('r', 1, 1))\",\"solution_key\":\"san:Nc8 Qxd4 Kxd4 Nb3 Ke4 Bxc6\",\"answer_key\":\"answer:Qxd4 Kxd4 Nb3 Ke4 Bxc6\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Re7#\",\"threat_uci\":\"b7e7\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers d5, d6 in the mate net.\",\"material_note\":\"added qa7; material 1 -> 10; eval -381 -> +521 cp\",\"force_notes\":[\"Only Qxd4+ wins; 32 quiet moves allow mate in 1.\",\"4 checking tries do not solve the puzzle.\"],\"line_notes\":[{\"ply\":2,\"text\":\"Kxd4 forced\"},{\"ply\":4,\"text\":\"Ke4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Re7#\",\"THREAT_UCI: b7e7\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers d5, d6 in the mate net.\",\"MATERIAL: added qa7; material 1 -> 10; eval -381 -> +521 cp\",\"FORCE: Only Qxd4+ wins; 32 quiet moves allow mate in 1.\",\"FORCE: 4 checking tries do not solve the puzzle.\",\"NOTE 2: Kxd4 forced\",\"NOTE 4: Ke4 forced\"]}","created_at":"2026-07-17 23:53:00","_table":"pcp_chess_puzzles"},{"id":313,"puzzle_hash":"8b3a706d4572a17e94de45401f48e57c4421a3e9e2291d1690889312c27bb370","fen":"n7/8/1p1K1p2/1Rn2k2/3Qb3/1R2B3/4N1Pr/b6q b - - 0 1","line_san":"1...Rh7?? 2.Qxe4+!! Kxe4 3.Ng3#","sac_mode":"queen","inner_depth":1,"threat_text":"Black threatens Rd7#","material_note":"added qh1, na8, ba1; material -13 -> 2; eval -806 -> +477 cp","payload":"{\"puzzle_hash\":\"8b3a706d4572a17e94de45401f48e57c4421a3e9e2291d1690889312c27bb370\",\"fen\":\"n7/8/1p1K1p2/1Rn2k2/3Qb3/1R2B3/4N1Pr/b6q b - - 0 1\",\"line_san\":\"1...Rh7?? 2.Qxe4+!! Kxe4 3.Ng3#\",\"generator_seed\":2647446626,\"generator_args\":[\"sac=queen\",\"inner=1\"],\"pattern_key\":\"(('B', -2, -1), ('K', 1, -2), ('N', -3, -1), ('P', -3, 1), ('Q', -1, -2), ('R', -2, -4), ('R', 0, -4), ('b', -4, -5), ('b', -1, -1), ('k', 0, 0), ('n', 0, -3), ('n', 3, -5), ('p', 1, -4), ('p', 1, 0), ('q', -4, 2), ('r', -3, 2))\",\"solution_key\":\"san:Rh7 Qxe4 Kxe4 Ng3\",\"answer_key\":\"answer:Qxe4 Kxe4 Ng3\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner1\",\"sac_mode\":\"queen\",\"inner_depth\":1,\"threat_text\":\"Black threatens Rd7#\",\"threat_uci\":\"h7d7\",\"threat_piece\":\"R\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e5, e6 in the mate net.\",\"material_note\":\"added qh1, na8, ba1; material -13 -> 2; eval -806 -> +477 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxe4 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner1\",\"SAC_MODE: queen\",\"INNER_DEPTH: 1\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Rd7#\",\"THREAT_UCI: h7d7\",\"THREAT_PIECE: R\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e5, e6 in the mate net.\",\"MATERIAL: added qh1, na8, ba1; material -13 -> 2; eval -806 -> +477 cp\",\"NOTE 2: Kxe4 forced\"]}","created_at":"2026-07-17 20:02:24","_table":"pcp_chess_puzzles"},{"id":312,"puzzle_hash":"912b5b75e585e9023ce308111ad7382fb5b6d6764f53654e9c80228ead099d35","fen":"8/1n1qbN2/3p1k2/3P1p2/1ppK2R1/4P3/n4Q2/4B3 b - - 0 1","line_san":"1...Qc7?? 2.Qxf5+!! Kxf5 3.Nh6+ Kf6 4.Bh4#","sac_mode":"queen","inner_depth":2,"threat_text":"Black threatens Qc5#","material_note":"added na2; material -3 -> 0; eval +132 -> +377 cp","payload":"{\"puzzle_hash\":\"912b5b75e585e9023ce308111ad7382fb5b6d6764f53654e9c80228ead099d35\",\"fen\":\"8/1n1qbN2/3p1k2/3P1p2/1ppK2R1/4P3/n4Q2/4B3 b - - 0 1\",\"line_san\":\"1...Qc7?? 2.Qxf5+!! Kxf5 3.Nh6+ Kf6 4.Bh4#\",\"generator_seed\":572048138,\"generator_args\":[\"sac=queen\",\"inner=2\"],\"pattern_key\":\"(('B', -5, -1), ('K', -2, -2), ('N', 1, 0), ('P', -3, -1), ('P', -1, -2), ('Q', -4, 0), ('R', -2, 1), ('b', 1, -1), ('k', 0, 0), ('n', -4, -5), ('n', 1, -4), ('p', -2, -4), ('p', -2, -3), ('p', -1, 0), ('p', 0, -2), ('q', 1, -2))\",\"solution_key\":\"san:Qc7 Qxf5 Kxf5 Nh6 Kf6 Bh4\",\"answer_key\":\"answer:Qxf5 Kxf5 Nh6 Kf6 Bh4\",\"inner_duplicate_key\":null,\"inner_duplicate_digest\":null,\"pack_slot\":\"queen_inner2\",\"sac_mode\":\"queen\",\"inner_depth\":2,\"threat_text\":\"Black threatens Qc5#\",\"threat_uci\":\"c7c5\",\"threat_piece\":\"Q\",\"threat_type\":\"generic-combo\",\"king_note\":\"Black king covers e5 in the mate net.\",\"material_note\":\"added na2; material -3 -> 0; eval +132 -> +377 cp\",\"force_notes\":[],\"line_notes\":[{\"ply\":2,\"text\":\"Kxf5 forced\"},{\"ply\":4,\"text\":\"Kf6 forced\"}],\"raw_notes\":[\"PACK_SLOT: queen_inner2\",\"SAC_MODE: queen\",\"INNER_DEPTH: 2\",\"INNER_FAMILY: piece-mate\",\"THREAT: Black threatens Qc5#\",\"THREAT_UCI: c7c5\",\"THREAT_PIECE: Q\",\"THREAT_TYPE: generic-combo\",\"KING: Black king covers e5 in the mate net.\",\"MATERIAL: added na2; material -3 -> 0; eval +132 -> +377 cp\",\"NOTE 2: Kxf5 forced\",\"NOTE 4: Kf6 forced\"]}","created_at":"2026-07-17 19:43:19","_table":"pcp_chess_puzzles"}]}