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chess-project/fixtures/tactics/back_rank_weakness.json
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Stefan 9ebca615c7 playwright
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{
"description": "High-quality BACK_RANK_WEAKNESS tactical puzzles from Lichess database",
"source": "https://database.lichess.org/",
"generatedAt": "auto-generated",
"cases": [
{
"id": "00cJo",
"initialFen": "6k1/5ppp/8/8/1P2p3/3bQpP1/1q1P1K1P/R1r5 w - - 0 31",
"sideToMove": "white",
"rating": 857,
"bestMove": {
"san": "Ra8+",
"uci": "a1a8"
},
"moves": [
{
"uci": "a1a8",
"san": "Ra8+",
"player": true
},
{
"uci": "c1c8",
"san": "Rc8",
"player": false
},
{
"uci": "a8c8",
"san": "Rxc8#",
"player": true
}
],
"resultingFen": "2R3k1/5ppp/8/8/1P2p3/3bQpP1/1q1P1K1P/8 b - - 0 32",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 00cJo (Rating: 857, Popularity: 100)",
"tags": [
"backRankMate",
"endgame",
"mate",
"mateIn2",
"short"
]
},
{
"id": "014It",
"initialFen": "1k1rR3/p1p3pp/Pp3r2/3p4/Q2N4/8/1PPq1PPP/4R1K1 b - - 4 25",
"sideToMove": "black",
"rating": 1389,
"bestMove": {
"san": "Qxf2+",
"uci": "d2f2"
},
"moves": [
{
"uci": "d2f2",
"san": "Qxf2+",
"player": true
},
{
"uci": "g1h1",
"san": "Kh1",
"player": false
},
{
"uci": "f2f1",
"san": "Qf1+",
"player": true
},
{
"uci": "e1f1",
"san": "Rxf1",
"player": false
},
{
"uci": "f6f1",
"san": "Rxf1#",
"player": true
}
],
"resultingFen": "1k1rR3/p1p3pp/Pp6/3p4/Q2N4/8/1PP3PP/5r1K w - - 0 28",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 014It (Rating: 1389, Popularity: 100)",
"tags": [
"backRankMate",
"long",
"mate",
"mateIn3",
"middlegame",
"sacrifice"
]
},
{
"id": "0192c",
"initialFen": "2r3k1/1Q3ppp/2pB4/2Pp1b1n/3p3K/P4P2/6qP/R3R3 w - - 0 25",
"sideToMove": "white",
"rating": 1123,
"bestMove": {
"san": "Qxc8+",
"uci": "b7c8"
},
"moves": [
{
"uci": "b7c8",
"san": "Qxc8+",
"player": true
},
{
"uci": "f5c8",
"san": "Bxc8",
"player": false
},
{
"uci": "e1e8",
"san": "Re8#",
"player": true
}
],
"resultingFen": "2b1R1k1/5ppp/2pB4/2Pp3n/3p3K/P4P2/6qP/R7 b - - 1 26",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 0192c (Rating: 1123, Popularity: 100)",
"tags": [
"backRankMate",
"mate",
"mateIn2",
"middlegame",
"sacrifice",
"short"
]
},
{
"id": "01czg",
"initialFen": "4kr2/p3n3/2p4Q/2PpP1N1/2pB1p2/q1P5/1R3PPP/6K1 b - - 0 29",
"sideToMove": "black",
"rating": 865,
"bestMove": {
"san": "Qa1+",
"uci": "a3a1"
},
"moves": [
{
"uci": "a3a1",
"san": "Qa1+",
"player": true
},
{
"uci": "b2b1",
"san": "Rb1",
"player": false
},
{
"uci": "a1b1",
"san": "Qxb1#",
"player": true
}
],
"resultingFen": "4kr2/p3n3/2p4Q/2PpP1N1/2pB1p2/2P5/5PPP/1q4K1 w - - 0 31",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 01czg (Rating: 865, Popularity: 100)",
"tags": [
"backRankMate",
"fork",
"mate",
"mateIn2",
"middlegame",
"short"
]
},
{
"id": "02HAo",
"initialFen": "Q6B/2r1kp2/2Pp4/p6p/P3n1pq/8/1P3PPP/4R1K1 b - - 6 28",
"sideToMove": "black",
"rating": 903,
"bestMove": {
"san": "Qxf2+",
"uci": "h4f2"
},
"moves": [
{
"uci": "h4f2",
"san": "Qxf2+",
"player": true
},
{
"uci": "g1h1",
"san": "Kh1",
"player": false
},
{
"uci": "f2e1",
"san": "Qxe1#",
"player": true
}
],
"resultingFen": "Q6B/2r1kp2/2Pp4/p6p/P3n1p1/8/1P4PP/4q2K w - - 0 30",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 02HAo (Rating: 903, Popularity: 100)",
"tags": [
"backRankMate",
"endgame",
"fork",
"mate",
"mateIn2",
"short"
]
},
{
"id": "02ahl",
"initialFen": "2k5/ppp2Bpp/8/8/5b2/1KP5/PP5r/3R4 w - - 0 23",
"sideToMove": "white",
"rating": 955,
"bestMove": {
"san": "Be6+",
"uci": "f7e6"
},
"moves": [
{
"uci": "f7e6",
"san": "Be6+",
"player": true
},
{
"uci": "c8b8",
"san": "Kb8",
"player": false
},
{
"uci": "d1d8",
"san": "Rd8#",
"player": true
}
],
"resultingFen": "1k1R4/ppp3pp/4B3/8/5b2/1KP5/PP5r/8 b - - 3 24",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 02ahl (Rating: 955, Popularity: 100)",
"tags": [
"backRankMate",
"endgame",
"mate",
"mateIn2",
"short"
]
},
{
"id": "037Me",
"initialFen": "r5k1/pp3pbp/1qpp4/3p1NQ1/2P1r3/8/PP3RPP/1RB4K b - - 2 21",
"sideToMove": "black",
"rating": 855,
"bestMove": {
"san": "Re1+",
"uci": "e4e1"
},
"moves": [
{
"uci": "e4e1",
"san": "Re1+",
"player": true
},
{
"uci": "f2f1",
"san": "Rf1",
"player": false
},
{
"uci": "e1f1",
"san": "Rxf1#",
"player": true
}
],
"resultingFen": "r5k1/pp3pbp/1qpp4/3p1NQ1/2P5/8/PP4PP/1RB2r1K w - - 0 23",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 037Me (Rating: 855, Popularity: 100)",
"tags": [
"backRankMate",
"mate",
"mateIn2",
"middlegame",
"short"
]
},
{
"id": "03HnL",
"initialFen": "4r2k/2rP2pp/1q3p2/8/1p6/1B4PP/P4bK1/2RR4 w - - 0 39",
"sideToMove": "white",
"rating": 907,
"bestMove": {
"san": "dxe8=Q#",
"uci": "d7e8q"
},
"moves": [
{
"uci": "d7e8q",
"san": "dxe8=Q#",
"player": true
}
],
"resultingFen": "4Q2k/2r3pp/1q3p2/8/1p6/1B4PP/P4bK1/2RR4 b - - 0 39",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 03HnL (Rating: 907, Popularity: 100)",
"tags": [
"advancedPawn",
"backRankMate",
"mate",
"mateIn1",
"middlegame",
"oneMove",
"promotion"
]
},
{
"id": "03goR",
"initialFen": "2r3k1/R4pbp/6p1/8/1B6/8/P4RPP/6K1 b - - 0 23",
"sideToMove": "black",
"rating": 1310,
"bestMove": {
"san": "Rc1+",
"uci": "c8c1"
},
"moves": [
{
"uci": "c8c1",
"san": "Rc1+",
"player": true
},
{
"uci": "b4e1",
"san": "Be1",
"player": false
},
{
"uci": "c1e1",
"san": "Rxe1+",
"player": true
},
{
"uci": "f2f1",
"san": "Rf1",
"player": false
},
{
"uci": "g7d4",
"san": "Bd4+",
"player": true
},
{
"uci": "g1h1",
"san": "Kh1",
"player": false
},
{
"uci": "e1f1",
"san": "Rxf1#",
"player": true
}
],
"resultingFen": "6k1/R4p1p/6p1/8/3b4/8/P5PP/5r1K w - - 0 27",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 03goR (Rating: 1310, Popularity: 100)",
"tags": [
"backRankMate",
"deflection",
"endgame",
"fork",
"mate",
"mateIn4",
"veryLong"
]
},
{
"id": "03wAm",
"initialFen": "4r1k1/1Q4pp/p1p5/P2p4/4q3/6P1/5R1P/6K1 w - - 0 41",
"sideToMove": "white",
"rating": 1153,
"bestMove": {
"san": "Qf7+",
"uci": "b7f7"
},
"moves": [
{
"uci": "b7f7",
"san": "Qf7+",
"player": true
},
{
"uci": "g8h8",
"san": "Kh8",
"player": false
},
{
"uci": "f7f8",
"san": "Qf8+",
"player": true
},
{
"uci": "e8f8",
"san": "Rxf8",
"player": false
},
{
"uci": "f2f8",
"san": "Rxf8#",
"player": true
}
],
"resultingFen": "5R1k/6pp/p1p5/P2p4/4q3/6P1/7P/6K1 b - - 0 43",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 03wAm (Rating: 1153, Popularity: 100)",
"tags": [
"backRankMate",
"endgame",
"long",
"mate",
"mateIn3",
"sacrifice"
]
},
{
"id": "04ANp",
"initialFen": "4r3/p5pk/3N3p/4qn2/2P2p2/1P3P2/P1Q3PP/3R3K b - - 6 42",
"sideToMove": "black",
"rating": 910,
"bestMove": {
"san": "Qe1+",
"uci": "e5e1"
},
"moves": [
{
"uci": "e5e1",
"san": "Qe1+",
"player": true
},
{
"uci": "d1e1",
"san": "Rxe1",
"player": false
},
{
"uci": "e8e1",
"san": "Rxe1#",
"player": true
}
],
"resultingFen": "8/p5pk/3N3p/5n2/2P2p2/1P3P2/P1Q3PP/4r2K w - - 0 44",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 04ANp (Rating: 910, Popularity: 100)",
"tags": [
"backRankMate",
"endgame",
"mate",
"mateIn2",
"sacrifice",
"short"
]
},
{
"id": "0579P",
"initialFen": "5r2/2p1b1kp/1qPpQ1p1/4p3/1p2R3/1P6/P4PPP/R5K1 b - - 3 29",
"sideToMove": "black",
"rating": 886,
"bestMove": {
"san": "Qxf2+",
"uci": "b6f2"
},
"moves": [
{
"uci": "b6f2",
"san": "Qxf2+",
"player": true
},
{
"uci": "g1h1",
"san": "Kh1",
"player": false
},
{
"uci": "f2f1",
"san": "Qf1+",
"player": true
},
{
"uci": "a1f1",
"san": "Rxf1",
"player": false
},
{
"uci": "f8f1",
"san": "Rxf1#",
"player": true
}
],
"resultingFen": "8/2p1b1kp/2PpQ1p1/4p3/1p2R3/1P6/P5PP/5r1K w - - 0 32",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 0579P (Rating: 886, Popularity: 100)",
"tags": [
"backRankMate",
"endgame",
"long",
"mate",
"mateIn3",
"sacrifice"
]
},
{
"id": "02zar",
"initialFen": "r1bk1r2/pppp2pp/8/2PNQq2/8/8/PPP3PP/R1B1R1K1 b - - 0 17",
"sideToMove": "black",
"rating": 1205,
"bestMove": {
"san": "Qf2+",
"uci": "f5f2"
},
"moves": [
{
"uci": "f5f2",
"san": "Qf2+",
"player": true
},
{
"uci": "g1h1",
"san": "Kh1",
"player": false
},
{
"uci": "f2f1",
"san": "Qf1+",
"player": true
},
{
"uci": "e1f1",
"san": "Rxf1",
"player": false
},
{
"uci": "f8f1",
"san": "Rxf1#",
"player": true
}
],
"resultingFen": "r1bk4/pppp2pp/8/2PNQ3/8/8/PPP3PP/R1B2r1K w - - 0 20",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 02zar (Rating: 1205, Popularity: 99)",
"tags": [
"backRankMate",
"long",
"mate",
"mateIn3",
"middlegame",
"sacrifice"
]
},
{
"id": "01pl8",
"initialFen": "3r4/pR4p1/2p2N1k/4p2p/2B1Pn1N/1P6/P1P2PPP/3R2K1 b - - 0 31",
"sideToMove": "black",
"rating": 1135,
"bestMove": {
"san": "Rxd1+",
"uci": "d8d1"
},
"moves": [
{
"uci": "d8d1",
"san": "Rxd1+",
"player": true
},
{
"uci": "c4f1",
"san": "Bf1",
"player": false
},
{
"uci": "f4e2",
"san": "Ne2+",
"player": true
},
{
"uci": "g1h1",
"san": "Kh1",
"player": false
},
{
"uci": "d1f1",
"san": "Rxf1#",
"player": true
}
],
"resultingFen": "8/pR4p1/2p2N1k/4p2p/4P2N/1P6/P1P1nPPP/5r1K w - - 0 34",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 01pl8 (Rating: 1135, Popularity: 98)",
"tags": [
"backRankMate",
"deflection",
"hangingPiece",
"long",
"mate",
"mateIn3",
"middlegame",
"pin"
]
},
{
"id": "04wxn",
"initialFen": "6k1/1p1R1rpp/2p5/p3p1B1/4P2P/6qB/1PP5/4b2K w - - 0 28",
"sideToMove": "white",
"rating": 1091,
"bestMove": {
"san": "Rd8+",
"uci": "d7d8"
},
"moves": [
{
"uci": "d7d8",
"san": "Rd8+",
"player": true
},
{
"uci": "f7f8",
"san": "Rf8",
"player": false
},
{
"uci": "h3e6",
"san": "Be6+",
"player": true
},
{
"uci": "g8h8",
"san": "Kh8",
"player": false
},
{
"uci": "d8f8",
"san": "Rxf8#",
"player": true
}
],
"resultingFen": "5R1k/1p4pp/2p1B3/p3p1B1/4P2P/6q1/1PP5/4b2K b - - 0 30",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 04wxn (Rating: 1091, Popularity: 98)",
"tags": [
"backRankMate",
"deflection",
"endgame",
"long",
"master",
"masterVsMaster",
"mate",
"mateIn3"
]
},
{
"id": "012tD",
"initialFen": "8/5ppk/7p/2pr4/4p3/4P3/1Qp2PPP/R5K1 b - - 2 36",
"sideToMove": "black",
"rating": 802,
"bestMove": {
"san": "Rd1+",
"uci": "d5d1"
},
"moves": [
{
"uci": "d5d1",
"san": "Rd1+",
"player": true
},
{
"uci": "a1d1",
"san": "Rxd1",
"player": false
},
{
"uci": "c2d1q",
"san": "cxd1=Q#",
"player": true
}
],
"resultingFen": "8/5ppk/7p/2p5/4p3/4P3/1Q3PPP/3q2K1 w - - 0 38",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 012tD (Rating: 802, Popularity: 96)",
"tags": [
"advancedPawn",
"backRankMate",
"endgame",
"mate",
"mateIn2",
"promotion",
"queenRookEndgame",
"short"
]
},
{
"id": "02QKd",
"initialFen": "6k1/1p1p1ppp/1P2p3/2r5/6n1/7q/1PPPPP1P/R1BQ1nK1 w - - 1 19",
"sideToMove": "white",
"rating": 816,
"bestMove": {
"san": "Ra8+",
"uci": "a1a8"
},
"moves": [
{
"uci": "a1a8",
"san": "Ra8+",
"player": true
},
{
"uci": "c5c8",
"san": "Rc8",
"player": false
},
{
"uci": "a8c8",
"san": "Rxc8#",
"player": true
}
],
"resultingFen": "2R3k1/1p1p1ppp/1P2p3/8/6n1/7q/1PPPPP1P/2BQ1nK1 b - - 0 20",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 02QKd (Rating: 816, Popularity: 96)",
"tags": [
"backRankMate",
"mate",
"mateIn2",
"middlegame",
"short"
]
},
{
"id": "03xmY",
"initialFen": "1R3bk1/7p/2Qp1rp1/2p5/P1P1p3/8/q4PPP/1R4K1 b - - 3 35",
"sideToMove": "black",
"rating": 1096,
"bestMove": {
"san": "Qxf2+",
"uci": "a2f2"
},
"moves": [
{
"uci": "a2f2",
"san": "Qxf2+",
"player": true
},
{
"uci": "g1h1",
"san": "Kh1",
"player": false
},
{
"uci": "f2f1",
"san": "Qf1+",
"player": true
},
{
"uci": "b1f1",
"san": "Rxf1",
"player": false
},
{
"uci": "f6f1",
"san": "Rxf1#",
"player": true
}
],
"resultingFen": "1R3bk1/7p/2Qp2p1/2p5/P1P1p3/8/6PP/5r1K w - - 0 38",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 03xmY (Rating: 1096, Popularity: 96)",
"tags": [
"backRankMate",
"endgame",
"long",
"mate",
"mateIn3",
"sacrifice"
]
},
{
"id": "04qGt",
"initialFen": "5rk1/6pp/3R4/p7/1p5q/1P1Q4/2B3PP/4R2K b - - 0 34",
"sideToMove": "black",
"rating": 828,
"bestMove": {
"san": "Qxe1+",
"uci": "h4e1"
},
"moves": [
{
"uci": "h4e1",
"san": "Qxe1+",
"player": true
},
{
"uci": "d3f1",
"san": "Qf1",
"player": false
},
{
"uci": "f8f1",
"san": "Rxf1#",
"player": true
}
],
"resultingFen": "6k1/6pp/3R4/p7/1p6/1P6/2B3PP/4qr1K w - - 0 36",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 04qGt (Rating: 828, Popularity: 96)",
"tags": [
"backRankMate",
"endgame",
"mate",
"mateIn2",
"short"
]
},
{
"id": "05Kjq",
"initialFen": "6k1/R1p2ppp/3b4/4pN2/4n2P/6P1/P1r2PK1/8 w - - 1 29",
"sideToMove": "white",
"rating": 1085,
"bestMove": {
"san": "Ra8+",
"uci": "a7a8"
},
"moves": [
{
"uci": "a7a8",
"san": "Ra8+",
"player": true
},
{
"uci": "d6f8",
"san": "Bf8",
"player": false
},
{
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{
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"resultingFen": "5R1k/2p1Nppp/8/4p3/4n2P/6P1/P1r2PK1/8 b - - 0 31",
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},
"context": "Lichess puzzle 05Kjq (Rating: 1085, Popularity: 96)",
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"backRankMate",
"deflection",
"endgame",
"long",
"mate",
"mateIn3",
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]
},
{
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"sideToMove": "black",
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},
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},
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{
"id": "01S2P",
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"sideToMove": "black",
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{
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{
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},
"context": "Lichess puzzle 01S2P (Rating: 1052, Popularity: 95)",
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{
"id": "01srl",
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"sideToMove": "black",
"rating": 861,
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},
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{
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{
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"resultingFen": "8/pQ5p/5kp1/1P6/P7/8/5PPP/4r1K1 w - - 0 36",
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},
"context": "Lichess puzzle 01srl (Rating: 861, Popularity: 95)",
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"mate",
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{
"id": "02zOY",
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"sideToMove": "black",
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"bestMove": {
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{
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{
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{
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},
"context": "Lichess puzzle 02zOY (Rating: 967, Popularity: 95)",
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{
"id": "033rG",
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"sideToMove": "black",
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{
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{
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{
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{
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"context": "Lichess puzzle 033rG (Rating: 1197, Popularity: 95)",
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{
"id": "038TX",
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{
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{
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{
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{
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"context": "Lichess puzzle 038TX (Rating: 1168, Popularity: 95)",
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},
{
"id": "03INy",
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"sideToMove": "white",
"rating": 1001,
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{
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{
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},
"context": "Lichess puzzle 03INy (Rating: 1001, Popularity: 95)",
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"endgame",
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{
"id": "01GBu",
"initialFen": "5r1k/3p2bp/p4pp1/qp1Pr3/8/1Q4B1/PP2RPPP/4R1K1 b - - 0 23",
"sideToMove": "black",
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{
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"san": "Rxe1",
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{
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"san": "Rxe1#",
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"resultingFen": "5r1k/3p2bp/p4pp1/1p1P4/8/1Q4B1/PP3PPP/4r1K1 w - - 0 25",
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},
"context": "Lichess puzzle 01GBu (Rating: 1314, Popularity: 94)",
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"xRayAttack"
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{
"id": "05CUt",
"initialFen": "R1b2rk1/6pp/4p1p1/3pP3/1Q1N4/1p6/2q2PPP/4R1K1 b - - 2 21",
"sideToMove": "black",
"rating": 1122,
"bestMove": {
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},
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{
"uci": "g1h1",
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{
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{
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{
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"context": "Lichess puzzle 05CUt (Rating: 1122, Popularity: 94)",
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{
"id": "00wL8",
"initialFen": "r5k1/2PR1ppp/8/8/7P/8/P3pqPK/8 w - - 0 34",
"sideToMove": "white",
"rating": 911,
"bestMove": {
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{
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{
"uci": "c7d8q",
"san": "cxd8=Q#",
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],
"resultingFen": "3Q2k1/5ppp/8/8/7P/8/P3pqPK/8 b - - 0 35",
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},
{
"id": "042sd",
"initialFen": "2r3k1/pb3ppp/4pn2/7q/4n3/B4NP1/P1Q1PPBP/3R2K1 w - - 1 19",
"sideToMove": "white",
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"bestMove": {
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{
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{
"uci": "d1d8",
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{
"uci": "f6e8",
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{
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],
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},
{
"id": "04xcy",
"initialFen": "5r1k/6pp/1p6/p7/3p4/bP1Q4/4RqPP/4R2K b - - 1 31",
"sideToMove": "black",
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},
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"san": "Qf1+",
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{
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"san": "Rxf1",
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{
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],
"resultingFen": "7k/6pp/1p6/p7/3p4/bP1Q4/4R1PP/5r1K w - - 0 33",
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{
"id": "03XcA",
"initialFen": "Q7/pp1k1p1p/8/8/1b2q3/1bN5/1P3PPP/RN3K1R b - - 2 20",
"sideToMove": "black",
"rating": 1542,
"bestMove": {
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"uci": "b3c4"
},
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{
"uci": "c3e2",
"san": "Ne2",
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{
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"san": "Qxe2+",
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{
"uci": "f1g1",
"san": "Kg1",
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},
{
"uci": "e2d1",
"san": "Qd1#",
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}
],
"resultingFen": "Q7/pp1k1p1p/8/8/1bb5/8/1P3PPP/RN1q2KR w - - 2 23",
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},
"context": "Lichess puzzle 03XcA (Rating: 1542, Popularity: 92)",
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},
{
"id": "03YqX",
"initialFen": "5r2/kpR1R1pp/p7/4P3/5n2/8/6PP/6K1 b - - 5 34",
"sideToMove": "black",
"rating": 830,
"bestMove": {
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"uci": "f4e2"
},
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"san": "Ne2+",
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{
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"san": "Kh1",
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},
{
"uci": "f8f1",
"san": "Rf1#",
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}
],
"resultingFen": "8/kpR1R1pp/p7/4P3/8/8/4n1PP/5r1K w - - 8 36",
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},
"context": "Lichess puzzle 03YqX (Rating: 830, Popularity: 92)",
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},
{
"id": "05Fi9",
"initialFen": "4r1k1/Q4ppp/3p4/6q1/P7/4r2P/1PP3P1/5RK1 w - - 0 22",
"sideToMove": "white",
"rating": 1165,
"bestMove": {
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"uci": "a7f7"
},
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{
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{
"uci": "f7f8",
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},
{
"uci": "e8f8",
"san": "Rxf8",
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},
{
"uci": "f1f8",
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}
],
"resultingFen": "5R1k/6pp/3p4/6q1/P7/4r2P/1PP3P1/6K1 b - - 0 24",
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},
"context": "Lichess puzzle 05Fi9 (Rating: 1165, Popularity: 92)",
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"long",
"mate",
"mateIn3",
"sacrifice"
]
},
{
"id": "05Ryc",
"initialFen": "k2rRn2/p1Q5/1p6/3q4/8/2N3B1/PPP2P1P/1K6 b - - 0 27",
"sideToMove": "black",
"rating": 1870,
"bestMove": {
"san": "Qh1+",
"uci": "d5h1"
},
"moves": [
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"san": "Qh1+",
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},
{
"uci": "e8e1",
"san": "Re1",
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},
{
"uci": "h1e1",
"san": "Qxe1+",
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},
{
"uci": "c3d1",
"san": "Nd1",
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},
{
"uci": "d8d1",
"san": "Rxd1#",
"player": true
}
],
"resultingFen": "k4n2/p1Q5/1p6/8/8/6B1/PPP2P1P/1K1rq3 w - - 0 30",
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},
"context": "Lichess puzzle 05Ryc (Rating: 1870, Popularity: 92)",
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},
{
"id": "00O9a",
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"sideToMove": "black",
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"bestMove": {
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"uci": "a7f2"
},
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"san": "Qxf2+",
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},
{
"uci": "g1h1",
"san": "Kh1",
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},
{
"uci": "f2f1",
"san": "Qf1+",
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},
{
"uci": "a1f1",
"san": "Rxf1",
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},
{
"uci": "f8f1",
"san": "Rxf1#",
"player": true
}
],
"resultingFen": "1k6/6r1/2Qp3p/3Bp3/2N1P1p1/P7/1PP3PP/5r1K w - - 0 38",
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},
"context": "Lichess puzzle 00O9a (Rating: 985, Popularity: 91)",
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]
},
{
"id": "01vCu",
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"sideToMove": "white",
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"bestMove": {
"san": "Qxf7+",
"uci": "f3f7"
},
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{
"uci": "f3f7",
"san": "Qxf7+",
"player": true
},
{
"uci": "g8h8",
"san": "Kh8",
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},
{
"uci": "f7f8",
"san": "Qf8+",
"player": true
},
{
"uci": "e8f8",
"san": "Rxf8",
"player": false
},
{
"uci": "f1f8",
"san": "Rxf8#",
"player": true
}
],
"resultingFen": "rn3R1k/ppp3pp/3p4/4q3/4P3/4B1P1/P1P4P/R5K1 b - - 0 20",
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},
"context": "Lichess puzzle 01vCu (Rating: 950, Popularity: 91)",
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},
{
"id": "03N75",
"initialFen": "r5k1/P4ppp/3Qp3/r2p4/2n5/7P/5PP1/6K1 w - - 3 32",
"sideToMove": "white",
"rating": 1259,
"bestMove": {
"san": "Qb8+",
"uci": "d6b8"
},
"moves": [
{
"uci": "d6b8",
"san": "Qb8+",
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},
{
"uci": "a8b8",
"san": "Rxb8",
"player": false
},
{
"uci": "a7b8q",
"san": "axb8=Q#",
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}
],
"resultingFen": "1Q4k1/5ppp/4p3/r2p4/2n5/7P/5PP1/6K1 b - - 0 33",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 03N75 (Rating: 1259, Popularity: 91)",
"tags": [
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"backRankMate",
"endgame",
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{
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"sideToMove": "black",
"rating": 991,
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"uci": "c2f2"
},
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"player": true
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{
"uci": "g1h1",
"san": "Kh1",
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{
"uci": "f2f1",
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},
{
"uci": "a1f1",
"san": "Rxf1",
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},
{
"uci": "f8f1",
"san": "Rxf1#",
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}
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"resultingFen": "r6k/6p1/p6p/4Q3/3P4/P1P1R3/6PP/5r1K w - - 0 26",
"expectedPattern": {
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},
"context": "Lichess puzzle 03RFD (Rating: 991, Popularity: 91)",
"tags": [
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"long",
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},
{
"id": "03a1M",
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"sideToMove": "white",
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"bestMove": {
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},
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{
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},
{
"uci": "f7f8",
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{
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{
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}
],
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"expectedPattern": {
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},
"context": "Lichess puzzle 03a1M (Rating: 1008, Popularity: 91)",
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{
"id": "05E1y",
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"sideToMove": "white",
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"bestMove": {
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},
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"san": "Nxf7+",
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},
{
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{
"uci": "d1d8",
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},
{
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"san": "Rf8",
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{
"uci": "d8f8",
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],
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"expectedPattern": {
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},
"context": "Lichess puzzle 05E1y (Rating: 1250, Popularity: 91)",
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]
},
{
"id": "04x6j",
"initialFen": "2r3k1/5ppp/Q3b3/2p1P3/1rP5/1p2q3/P4NPP/3R1RK1 w - - 0 26",
"sideToMove": "white",
"rating": 968,
"bestMove": {
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"uci": "a6c8"
},
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"san": "Qxc8+",
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},
{
"uci": "e6c8",
"san": "Bxc8",
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},
{
"uci": "d1d8",
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}
],
"resultingFen": "2bR2k1/5ppp/8/2p1P3/1rP5/1p2q3/P4NPP/5RK1 b - - 1 27",
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},
"context": "Lichess puzzle 04x6j (Rating: 968, Popularity: 90)",
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]
},
{
"id": "05HCz",
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"sideToMove": "black",
"rating": 968,
"bestMove": {
"san": "Qf1+",
"uci": "f2f1"
},
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"san": "Qf1+",
"player": true
},
{
"uci": "e1f1",
"san": "Rxf1",
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},
{
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}
],
"resultingFen": "r5k1/p2b2p1/2pP3p/8/8/3Q4/PB2R1PP/5r1K w - - 0 31",
"expectedPattern": {
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},
"context": "Lichess puzzle 05HCz (Rating: 968, Popularity: 90)",
"tags": [
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"sacrifice",
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]
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{
"id": "001Wz",
"initialFen": "6k1/5ppp/r1p5/p1n1rP2/8/2P2N1P/2P3P1/3R2K1 w - - 0 22",
"sideToMove": "white",
"rating": 1118,
"bestMove": {
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"uci": "d1d8"
},
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"san": "Rd8+",
"player": true
},
{
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"san": "Re8",
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},
{
"uci": "d8e8",
"san": "Rxe8#",
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}
],
"resultingFen": "4R1k1/5ppp/r1p5/p1n2P2/8/2P2N1P/2P3P1/6K1 b - - 0 23",
"expectedPattern": {
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},
"context": "Lichess puzzle 001Wz (Rating: 1118, Popularity: 89)",
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},
{
"id": "00RYH",
"initialFen": "1k5r/ppp1R2p/r4p2/5Q2/3p4/2qP4/2P2PPP/2K1R3 w - - 6 27",
"sideToMove": "white",
"rating": 1029,
"bestMove": {
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"uci": "e7e8"
},
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{
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{
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},
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"mate",
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},
{
"id": "053Os",
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"sideToMove": "black",
"rating": 835,
"bestMove": {
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"uci": "c3e2"
},
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"san": "Ne2+",
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{
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"san": "Kh1",
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},
{
"uci": "f8f1",
"san": "Rxf1#",
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}
],
"resultingFen": "6k1/6p1/3PP2p/1B4p1/2P5/P7/4n1PP/5r1K w - - 0 35",
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},
"context": "Lichess puzzle 053Os (Rating: 835, Popularity: 89)",
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{
"id": "00aBq",
"initialFen": "r5k1/pp3ppp/1qn2b2/3r4/4QB2/1P3N2/P4PPP/4R1K1 w - - 0 19",
"sideToMove": "white",
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"bestMove": {
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"uci": "e4e8"
},
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{
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{
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],
"resultingFen": "4R1k1/pp3ppp/1qn2b2/3r4/5B2/1P3N2/P4PPP/6K1 b - - 0 20",
"expectedPattern": {
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},
"context": "Lichess puzzle 00aBq (Rating: 896, Popularity: 88)",
"tags": [
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]
},
{
"id": "00rTX",
"initialFen": "3r2k1/pp3ppp/4p3/2N5/7q/1Q3P2/PP1R2PP/4R2K b - - 0 24",
"sideToMove": "black",
"rating": 977,
"bestMove": {
"san": "Qxe1#",
"uci": "h4e1"
},
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"san": "Qxe1#",
"player": true
}
],
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"expectedPattern": {
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},
"context": "Lichess puzzle 00rTX (Rating: 977, Popularity: 88)",
"tags": [
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"mate",
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"oneMove"
]
},
{
"id": "02Ub7",
"initialFen": "2r2nk1/p5pp/bp2p3/3pP1q1/3P4/1P3QP1/P2N2B1/5RK1 w - - 2 24",
"sideToMove": "white",
"rating": 1223,
"bestMove": {
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"uci": "f3f7"
},
"moves": [
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"san": "Qf7+",
"player": true
},
{
"uci": "g8h8",
"san": "Kh8",
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},
{
"uci": "f7f8",
"san": "Qxf8+",
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{
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"san": "Rxf8",
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{
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"san": "Rxf8#",
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}
],
"resultingFen": "5R1k/p5pp/bp2p3/3pP1q1/3P4/1P4P1/P2N2B1/6K1 b - - 0 26",
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},
"context": "Lichess puzzle 02Ub7 (Rating: 1223, Popularity: 88)",
"tags": [
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"long",
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]
},
{
"id": "02tEk",
"initialFen": "1r3rk1/p5pp/1qp5/4R3/8/PPQ5/2P2PPP/4R1K1 b - - 0 21",
"sideToMove": "black",
"rating": 1184,
"bestMove": {
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"uci": "b6f2"
},
"moves": [
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"san": "Qxf2+",
"player": true
},
{
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"san": "Kh1",
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},
{
"uci": "f2f1",
"san": "Qf1+",
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},
{
"uci": "e1f1",
"san": "Rxf1",
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},
{
"uci": "f8f1",
"san": "Rxf1#",
"player": true
}
],
"resultingFen": "1r4k1/p5pp/2p5/4R3/8/PPQ5/2P3PP/5r1K w - - 0 24",
"expectedPattern": {
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},
"context": "Lichess puzzle 02tEk (Rating: 1184, Popularity: 88)",
"tags": [
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"long",
"mate",
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]
},
{
"id": "05EKx",
"initialFen": "r1b3k1/pp4pp/1q6/3pN3/2pP4/7P/PP3QP1/R3K3 w Q - 1 23",
"sideToMove": "white",
"rating": 1014,
"bestMove": {
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"uci": "f2f7"
},
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"player": true
},
{
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"san": "Kh8",
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},
{
"uci": "f7e8",
"san": "Qe8#",
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}
],
"resultingFen": "r1b1Q2k/pp4pp/1q6/3pN3/2pP4/7P/PP4P1/R3K3 b Q - 4 24",
"expectedPattern": {
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},
"context": "Lichess puzzle 05EKx (Rating: 1014, Popularity: 88)",
"tags": [
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"mate",
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]
},
{
"id": "01Wqv",
"initialFen": "7k/1pp2rpp/p6r/4pP2/2Q1Pq2/8/PP4PP/3R3K w - - 0 33",
"sideToMove": "white",
"rating": 1300,
"bestMove": {
"san": "Rd8+",
"uci": "d1d8"
},
"moves": [
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"san": "Rd8+",
"player": true
},
{
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"san": "Rf8",
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},
{
"uci": "d8f8",
"san": "Rxf8#",
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}
],
"resultingFen": "5R1k/1pp3pp/p6r/4pP2/2Q1Pq2/8/PP4PP/7K b - - 0 34",
"expectedPattern": {
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},
"context": "Lichess puzzle 01Wqv (Rating: 1300, Popularity: 87)",
"tags": [
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"mate",
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]
},
{
"id": "01rGp",
"initialFen": "1r6/5pkp/6p1/8/8/8/1R3PPP/rR4K1 b - - 0 39",
"sideToMove": "black",
"rating": 861,
"bestMove": {
"san": "Rxb1+",
"uci": "a1b1"
},
"moves": [
{
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"san": "Rxb1+",
"player": true
},
{
"uci": "b2b1",
"san": "Rxb1",
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},
{
"uci": "b8b1",
"san": "Rxb1#",
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}
],
"resultingFen": "8/5pkp/6p1/8/8/8/5PPP/1r4K1 w - - 0 41",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 01rGp (Rating: 861, Popularity: 87)",
"tags": [
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"mate",
"mateIn2",
"rookEndgame",
"short",
"xRayAttack"
]
},
{
"id": "02nwT",
"initialFen": "rn3rk1/pp4pp/2p2q2/8/3PR3/2P5/P1P3PP/R1BQ2K1 b - - 0 17",
"sideToMove": "black",
"rating": 1159,
"bestMove": {
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"uci": "f6f2"
},
"moves": [
{
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"san": "Qf2+",
"player": true
},
{
"uci": "g1h1",
"san": "Kh1",
"player": false
},
{
"uci": "f2f1",
"san": "Qf1+",
"player": true
},
{
"uci": "d1f1",
"san": "Qxf1",
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},
{
"uci": "f8f1",
"san": "Rxf1#",
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}
],
"resultingFen": "rn4k1/pp4pp/2p5/8/3PR3/2P5/P1P3PP/R1B2r1K w - - 0 20",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 02nwT (Rating: 1159, Popularity: 87)",
"tags": [
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"long",
"mate",
"mateIn3",
"middlegame"
]
},
{
"id": "03xKf",
"initialFen": "2k5/ppp5/8/6p1/1K3p2/1P2pP2/r4r2/3R1B2 w - - 4 34",
"sideToMove": "white",
"rating": 890,
"bestMove": {
"san": "Bh3+",
"uci": "f1h3"
},
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{
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"san": "Bh3+",
"player": true
},
{
"uci": "g5g4",
"san": "g4",
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},
{
"uci": "h3g4",
"san": "Bxg4+",
"player": true
},
{
"uci": "c8b8",
"san": "Kb8",
"player": false
},
{
"uci": "d1d8",
"san": "Rd8#",
"player": true
}
],
"resultingFen": "1k1R4/ppp5/8/8/1K3pB1/1P2pP2/r4r2/8 b - - 2 36",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 03xKf (Rating: 890, Popularity: 87)",
"tags": [
"backRankMate",
"endgame",
"long",
"mate",
"mateIn3"
]
},
{
"id": "042fY",
"initialFen": "2r3k1/1R3ppp/8/4p1N1/3n4/3n4/P4PPP/5RK1 b - - 1 22",
"sideToMove": "black",
"rating": 1278,
"bestMove": {
"san": "Ne2+",
"uci": "d4e2"
},
"moves": [
{
"uci": "d4e2",
"san": "Ne2+",
"player": true
},
{
"uci": "g1h1",
"san": "Kh1",
"player": false
},
{
"uci": "d3f2",
"san": "Nxf2+",
"player": true
},
{
"uci": "f1f2",
"san": "Rxf2",
"player": false
},
{
"uci": "c8c1",
"san": "Rc1+",
"player": true
},
{
"uci": "f2f1",
"san": "Rf1",
"player": false
},
{
"uci": "c1f1",
"san": "Rxf1#",
"player": true
}
],
"resultingFen": "6k1/1R3ppp/8/4p1N1/8/8/P3n1PP/5r1K w - - 0 26",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 042fY (Rating: 1278, Popularity: 87)",
"tags": [
"backRankMate",
"deflection",
"endgame",
"mate",
"mateIn4",
"sacrifice",
"veryLong"
]
},
{
"id": "04TYh",
"initialFen": "rn1q1r1k/p1b3pp/2p4N/P2pp3/1pPP1QP1/7P/1P6/R4RK1 w - - 2 23",
"sideToMove": "white",
"rating": 1261,
"bestMove": {
"san": "Qxf8+",
"uci": "f4f8"
},
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{
"uci": "f4f8",
"san": "Qxf8+",
"player": true
},
{
"uci": "d8f8",
"san": "Qxf8",
"player": false
},
{
"uci": "f1f8",
"san": "Rxf8#",
"player": true
}
],
"resultingFen": "rn3R1k/p1b3pp/2p4N/P2pp3/1pPP2P1/7P/1P6/R5K1 b - - 0 24",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 04TYh (Rating: 1261, Popularity: 87)",
"tags": [
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"mate",
"mateIn2",
"middlegame",
"short"
]
},
{
"id": "04vgD",
"initialFen": "3N4/6pk/2p1R2p/8/5B2/8/r5PP/7K b - - 0 36",
"sideToMove": "black",
"rating": 1035,
"bestMove": {
"san": "Ra1+",
"uci": "a2a1"
},
"moves": [
{
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"san": "Ra1+",
"player": true
},
{
"uci": "f4c1",
"san": "Bc1",
"player": false
},
{
"uci": "a1c1",
"san": "Rxc1+",
"player": true
},
{
"uci": "e6e1",
"san": "Re1",
"player": false
},
{
"uci": "c1e1",
"san": "Rxe1#",
"player": true
}
],
"resultingFen": "3N4/6pk/2p4p/8/8/8/6PP/4r2K w - - 0 39",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 04vgD (Rating: 1035, Popularity: 87)",
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},
{
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{
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{
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{
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{
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},
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{
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{
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{
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{
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"sideToMove": "black",
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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],
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{
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"sideToMove": "white",
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],
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{
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"sideToMove": "black",
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{
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{
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],
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{
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{
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{
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{
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{
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{
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{
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{
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],
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},
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},
{
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{
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},
{
"uci": "f2f1",
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{
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},
{
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"san": "Rxf1#",
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],
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},
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},
{
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},
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{
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{
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{
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],
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{
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{
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{
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{
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{
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"san": "Rxe8#",
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],
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},
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"long",
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"middlegame"
]
},
{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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"sideToMove": "black",
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"bestMove": {
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{
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{
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],
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{
"id": "01rfL",
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"sideToMove": "white",
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],
"resultingFen": "3R2k1/5ppp/pp6/8/5P2/1Pq5/2P3PP/7K b - - 0 26",
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{
"id": "03B43",
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"sideToMove": "white",
"rating": 1352,
"bestMove": {
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{
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{
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{
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{
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],
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{
"id": "04OlI",
"initialFen": "r5k1/5ppp/B1Q5/3r1p2/8/1P6/Pq3PPP/6K1 w - - 0 24",
"sideToMove": "white",
"rating": 1144,
"bestMove": {
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],
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{
"id": "04AJP",
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{
"id": "03qMO",
"initialFen": "r6k/p5pp/2Q5/1p1p4/8/8/q1P2PPP/3R2K1 w - - 0 24",
"sideToMove": "white",
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],
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},
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{
"id": "04PzJ",
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"sideToMove": "black",
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"bestMove": {
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},
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{
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{
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],
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{
"id": "00mJY",
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"sideToMove": "white",
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"uci": "f7e6"
},
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{
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{
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],
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},
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{
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"sideToMove": "black",
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"uci": "h4e1"
},
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{
"id": "0572j",
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},
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],
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"mate",
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{
"id": "053a0",
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},
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{
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"san": "Rxe8",
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},
{
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],
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},
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{
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{
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},
{
"uci": "d1e1",
"san": "Rxe1#",
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}
],
"resultingFen": "2r5/5pkp/2R1p1p1/1b6/p3P3/P7/BP3PPP/4r1K1 w - - 0 30",
"expectedPattern": {
"type": "BACK_RANK_WEAKNESS"
},
"context": "Lichess puzzle 01esB (Rating: 1280, Popularity: 54)",
"tags": [
"backRankMate",
"endgame",
"mate",
"mateIn2",
"short"
]
}
]
}
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