mradermacher/knight-school-qwen3.5-2b-primer-m-GGUF
Reinforcement Learning • 2B • Updated • 620
PuzzleId stringlengths 5 5 | FEN stringlengths 35 72 | Moves stringlengths 9 41 | Rating int64 416 2.8k | RatingDeviation int64 72 90 | Popularity int64 51 100 | NbPlays int64 200 27k | Themes stringlengths 7 89 | GameUrl stringlengths 31 38 | OpeningTags stringclasses 69
values | DailyDate float64 | rating_bin int64 0 11 |
|---|---|---|---|---|---|---|---|---|---|---|---|
fMA5s | rb3rk1/1p3ppp/p1nq1n2/3p3b/1P1N4/P1N1P3/1B2BPPP/R2Q1RK1 w - - 5 15 | e2h5 d6h2 | 589 | 87 | 100 | 212 | kingsideAttack mate mateIn1 oneMove opening | https://lichess.org/RhgbdYrk#29 | Tarrasch_Defense Tarrasch_Defense_Symmetrical_Variation | null | 0 |
Ku5Hq | 4r3/1R3pkp/p1p3p1/1p1b2Q1/1P1P4/P5P1/5P2/6K1 w - - 4 43 | g5f4 e8e1 g1h2 e1h1 | 510 | 81 | 100 | 226 | endgame mate mateIn2 operaMate short | https://lichess.org/C1b6soqy#85 | null | null | 0 |
G3dim | r5k1/3n2b1/pp1ppqpp/8/6P1/5N2/PPP1QP2/1K1R3R w - - 2 24 | d1d6 f6b2 | 479 | 89 | 100 | 518 | mate mateIn1 middlegame oneMove queensideAttack | https://lichess.org/HQbpf0uu#47 | null | null | 0 |
PwXh8 | 2kr4/ppb5/4bnp1/7p/8/2P4P/PP3PP1/R1B1R1K1 w - - 0 23 | e1e6 d8d1 e6e1 d1e1 | 416 | 87 | 76 | 205 | endgame mate mateIn2 pillsburysMate short | https://lichess.org/afuBPCs9#45 | null | null | 0 |
DWbM5 | 4r2k/2p3pp/6p1/4Q3/8/7P/P5P1/3R3K b - - 0 31 | e8e5 d1d8 e5e8 d8e8 | 529 | 87 | 100 | 231 | backRankMate endgame mate mateIn2 rookEndgame short | https://lichess.org/mpG8c8jH/black#62 | null | null | 0 |
6cnND | 8/8/6k1/8/6p1/6R1/8/5qRK b - - 9 61 | f1f4 g3g4 f4g4 g1g4 | 526 | 90 | 100 | 378 | crushing endgame fork queenRookEndgame short | https://lichess.org/NIH3LUmw/black#122 | null | null | 0 |
w6Jdl | r1b3k1/1p2Qpp1/6qp/p1p5/P1BpPn2/1P3P1P/2P3P1/1R3RK1 w - - 1 26 | e7f7 g6f7 c4f7 g8f7 | 593 | 82 | 100 | 381 | advantage middlegame short | https://lichess.org/Jbd3znCt#51 | null | null | 0 |
3Nk3p | r3k1nr/p2q2pp/1pp3n1/4B3/8/2N2QP1/PPP3KP/R4R2 b kq - 0 18 | g6e5 f3f8 | 518 | 89 | 100 | 481 | mate mateIn1 middlegame oneMove | https://lichess.org/ORzezzVx/black#36 | Three_Knights_Opening Three_Knights_Opening_Other_variations | null | 0 |
OwFZI | r4qrk/1p3p1p/p4PpQ/2pPp1N1/2Pn4/3B3P/PP4P1/5RK1 b - - 7 23 | f8h6 g5f7 | 506 | 86 | 80 | 235 | kingsideAttack master mate mateIn1 middlegame oneMove | https://lichess.org/w2laVkKu/black#46 | null | null | 0 |
XGGXr | 6k1/6p1/p7/1p4Np/3q4/3Q3P/PP3PP1/2R3K1 b - - 0 33 | d4d3 c1c8 d3d8 c8d8 | 508 | 90 | 100 | 242 | endgame mate mateIn2 short | https://lichess.org/jyCWmq3e/black#66 | null | null | 0 |
QSdvA | r2q1rk1/pp1bb2p/4pRB1/2pp3Q/3P4/2P1P3/PP1N2PP/R1B3K1 b - - 0 14 | e7f6 h5h7 | 551 | 85 | 89 | 268 | kingsideAttack mate mateIn1 middlegame oneMove | https://lichess.org/ZNgJYhRq/black#28 | Horwitz_Defense Horwitz_Defense_Other_variations | null | 0 |
Z8uNI | 1b1kr3/pQ1n1ppp/2q5/1N6/8/7P/PPP2PP1/6K1 w - - 0 24 | b7c6 e8e1 | 514 | 90 | 86 | 279 | endgame mate mateIn1 oneMove pillsburysMate | https://lichess.org/kIzO7Dou#47 | null | null | 0 |
pVLG0 | 5r1k/p7/1p1r2pp/2bBq3/4P3/2B1Q2P/P3nPP1/3R1R1K b - - 5 32 | e2c3 e3h6 | 506 | 90 | 100 | 229 | kingsideAttack mate mateIn1 middlegame oneMove | https://lichess.org/BONoLrV7/black#64 | null | null | 0 |
08igm | r5k1/1b2rppp/1p3n2/1B1qp3/3p4/P6P/NPP1QPP1/3R1RK1 w - - 2 18 | c2c4 d5g2 | 507 | 87 | 100 | 383 | kingsideAttack mate mateIn1 middlegame oneMove | https://lichess.org/A5C3BkqL#35 | Sicilian_Defense Sicilian_Defense_Lowenthal_Variation | null | 0 |
2ZTQ9 | r2n1rk1/1bpqb1pp/p2pN3/3P2P1/7P/2Q4B/PPP2P2/R3K2R b KQ - 0 18 | d7a4 c3g7 | 563 | 82 | 100 | 302 | kingsideAttack mate mateIn1 middlegame oneMove | https://lichess.org/mJg0hyuw/black#36 | Dutch_Defense Dutch_Defense_Krejcik_Gambit | null | 0 |
yPOz9 | br3rk1/p4pbp/2qp1np1/2p1p3/N1P5/1P1QP1B1/P3BPPP/3R1RK1 w - - 4 18 | d3d2 c6g2 | 434 | 86 | 100 | 336 | kingsideAttack mate mateIn1 middlegame oneMove | https://lichess.org/oG1URd1S#35 | Indian_Defense Indian_Defense_Wade-Tartakower_Defense | null | 0 |
XuVi0 | 4r1k1/5pp1/p2p4/1p1P1P2/2P5/1P6/PB3qPP/5R1K w - - 0 28 | f1f2 e8e1 f2f1 e1f1 | 588 | 88 | 71 | 390 | backRankMate endgame mate mateIn2 short | https://lichess.org/ybEwbg7L#55 | null | null | 0 |
9oGQ7 | 2r3k1/ppN2ppp/8/4P3/8/8/PP2RPPP/n5K1 w - - 2 22 | c7d5 c8c1 e2e1 c1e1 | 538 | 86 | 81 | 523 | backRankMate endgame mate mateIn2 short | https://lichess.org/Swl8l0eV#43 | null | null | 0 |
4x7aK | r7/pppq1r1p/1k6/1B1pQ3/P7/2P5/1PP3PP/R3b2K w - - 2 23 | b5d7 f7f1 | 582 | 86 | 79 | 207 | backRankMate endgame mate mateIn1 oneMove | https://lichess.org/w920OOdE#45 | null | null | 0 |
G4BvW | 5rk1/1br1bppp/p1qp1n2/1p6/4PP2/P1NQB3/1PP3BP/R4RK1 w - - 1 20 | e4e5 c6g2 | 543 | 87 | 100 | 243 | kingsideAttack mate mateIn1 middlegame oneMove | https://lichess.org/GPX0Nujo#39 | null | null | 0 |
bYV92 | r4r2/p1p3k1/2Q1R3/6p1/8/6P1/P1p2qPP/2R3K1 w - - 3 28 | g1h1 f2f1 c1f1 f8f1 | 589 | 79 | 100 | 244 | backRankMate endgame mate mateIn2 sacrifice short | https://lichess.org/PhZbECgh#55 | null | null | 0 |
Lm7cR | 6k1/6p1/7r/3P2N1/5p2/2Bq4/1P3PP1/4R1K1 b - - 0 46 | d3d5 e1e8 | 588 | 83 | 100 | 240 | endgame master mate mateIn1 oneMove | https://lichess.org/tnFHgNJf/black#92 | null | null | 0 |
dVQ0W | 2q3k1/6p1/3bNn1p/3p4/1P6/P2Q1P2/1B4PP/7K w - - 3 33 | b2f6 c8c1 d3d1 c1d1 | 481 | 85 | 88 | 273 | endgame mate mateIn2 short | https://lichess.org/sYkvOaHQ#65 | null | null | 0 |
bYsWQ | 1r1q2rk/p1pnbpp1/3p3p/2pP1Q2/5P2/1P1B3P/PBP3P1/R4RK1 b - - 1 18 | e7f6 f5h7 | 545 | 89 | 100 | 264 | mate mateIn1 middlegame oneMove | https://lichess.org/eLIa4P8c/black#36 | Scotch_Game Scotch_Game_Other_variations | null | 0 |
KfgN7 | rnb2rk1/pp3ppp/4p3/6Nq/4QP2/2N3P1/PPP2P2/R4RK1 b - - 3 15 | h7h6 e4h7 | 554 | 83 | 100 | 291 | master mate mateIn1 middlegame oneMove | https://lichess.org/0UWbGpKd/black#30 | Indian_Defense Indian_Defense_Other_variations | null | 0 |
3InJC | r3r1k1/ppp2ppp/2b5/3p2n1/3P4/2P3Q1/PP3PPP/RN2R1K1 w - - 0 16 | g3g5 e8e1 | 549 | 85 | 100 | 242 | backRankMate hangingPiece mate mateIn1 middlegame oneMove | https://lichess.org/j88sHt8U#31 | Ponziani_Opening Ponziani_Opening_Neumann_Gambit | null | 0 |
qcf7h | 8/4k3/p6p/1p3np1/8/7P/PP6/3R2K1 w - - 0 33 | g1g2 f5e3 g2f3 e3d1 | 570 | 81 | 100 | 615 | crushing endgame fork short | https://lichess.org/D1JAP7uK#65 | null | null | 0 |
kHxEW | 3rkbnr/5pp1/2n1p2p/1p6/4p3/PB6/1PP2PPP/RNB1R1K1 w k - 0 14 | e1e4 d8d1 e4e1 d1e1 | 575 | 88 | 100 | 408 | backRankMate fork mate mateIn2 middlegame short | https://lichess.org/bQE9PJ0X#27 | Sicilian_Defense Sicilian_Defense_Bowdler_Attack | null | 0 |
zckK0 | 2kr3r/1qp2pb1/p2p3p/3P4/2pNP1bP/4B3/PPPQ4/1K3R1R w - - 0 24 | d4c6 b7b2 | 516 | 90 | 100 | 339 | mate mateIn1 middlegame oneMove queensideAttack | https://lichess.org/fMnQXjJS#47 | null | null | 0 |
vMC9A | 2k3rr/bbqp1p1p/p3p3/1p6/4P1nQ/2NB4/PPP1NPPP/R4RK1 w - - 3 17 | h2h3 c7h2 | 572 | 81 | 100 | 275 | mate mateIn1 middlegame oneMove | https://lichess.org/VS3bb7eE#33 | Sicilian_Defense Sicilian_Defense_Kan_Variation | null | 0 |
tKSnz | 8/5pkp/pqp5/1p2P1p1/4Q3/P1P2PpP/1P4K1/8 w - - 0 35 | g2g3 b6g1 | 534 | 88 | 100 | 356 | endgame epauletteMate mate mateIn1 oneMove queenEndgame | https://lichess.org/00AJJKwT#69 | null | null | 0 |
KNv25 | rn3rk1/1bp3pp/1p1ppnq1/p4pN1/3P1P2/2PB4/PP1N1PPP/R2QR1K1 w - - 4 14 | g5e6 g6g2 | 518 | 90 | 100 | 370 | kingsideAttack mate mateIn1 oneMove opening | https://lichess.org/wjGCwNv1#27 | Dutch_Defense Dutch_Defense_Other_variations | null | 0 |
0D0QY | r3R1k1/1p3ppp/p1q5/2n3P1/7P/2B5/PPP1Q3/1K2R3 b - - 0 26 | a8e8 e2e8 c6e8 e1e8 | 565 | 89 | 79 | 272 | endgame mate mateIn2 short | https://lichess.org/QvSVSe2S/black#52 | null | null | 0 |
cNL4A | k7/p4Rp1/B1p3p1/2p1p1b1/P5P1/2r5/5P2/6K1 b - - 0 28 | c3a3 f7f8 g5d8 f8d8 | 560 | 86 | 100 | 582 | endgame mate mateIn2 pillsburysMate short | https://lichess.org/GV48Lgei/black#56 | null | null | 0 |
DVekC | 1k6/p1p4p/1p2p3/4p3/Pq6/2N4Q/1P3RPP/3r3K w - - 1 28 | c3d1 b4e1 f2f1 e1f1 | 473 | 87 | 100 | 282 | endgame fork mate mateIn2 short | https://lichess.org/6xt2Jvgv#55 | null | null | 0 |
5nS9l | r3r1k1/p4npp/2p3q1/2P1pp2/3P4/P2BQ1B1/3K1P1P/4R3 b - - 1 29 | e5d4 e3e8 a8e8 e1e8 | 532 | 86 | 90 | 202 | backRankMate mate mateIn2 middlegame short | https://lichess.org/5MQMRm4K/black#58 | null | null | 0 |
G6cZO | r1b3k1/2p3pp/p2p4/1pnP1rb1/3q4/P1NN3P/BPP1Q1P1/R4R1K b - - 8 24 | c5d3 e2e8 f5f8 e8f8 | 482 | 88 | 100 | 368 | kingsideAttack mate mateIn2 middlegame short | https://lichess.org/Ns1Jl86f/black#48 | null | null | 0 |
KPsKY | rn1qkbnr/1p2pppp/8/1Pp1Nb2/8/1Q1pP3/P2P1PPP/RNB1KB1R b KQkq - 3 8 | g8f6 b3f7 | 569 | 88 | 100 | 431 | attackingF2F7 mate mateIn1 oneMove opening | https://lichess.org/rgG6uJnR/black#16 | Reti_Opening Reti_Opening_Advance_Variation | null | 0 |
DxAx3 | 6k1/1p3pbp/p3N1p1/8/5B2/P1r1P3/3r1PPP/3R2K1 w - - 0 24 | d1d2 c3c1 d2d1 c1d1 | 476 | 82 | 100 | 254 | backRankMate endgame master mate mateIn2 short | https://lichess.org/7KyMu5k6#47 | null | null | 0 |
V5Q87 | Nk1Rq2r/pp5p/8/3Rn1p1/1P1QP1n1/P5P1/K7/8 b - - 5 34 | e8d8 d5d8 h8d8 d4d8 | 592 | 82 | 100 | 442 | mate mateIn2 middlegame short | https://lichess.org/vNQ5bL7d/black#68 | null | null | 0 |
MjnCn | R4bk1/2p2pp1/1rq1p2p/3n4/3PQP2/3B3P/3B2P1/6K1 b - - 8 29 | c6a8 e4h7 | 526 | 83 | 51 | 269 | mate mateIn1 middlegame oneMove | https://lichess.org/RMLA7Req/black#58 | null | null | 0 |
KcRsK | rnbq2k1/pp3r1p/2p1p1Q1/3pB3/2PP2P1/2N2n2/PP3P2/2KR1B1R b - - 0 15 | h7g6 h1h8 | 582 | 88 | 86 | 242 | mate mateIn1 middlegame oneMove operaMate | https://lichess.org/90cEdgiB/black#30 | Modern_Defense Modern_Defense_Other_variations | null | 0 |
lRVYO | r2q1rk1/b4ppp/2p5/p2pP1N1/1p1P1Bb1/3Q4/PP3PPP/3RR1K1 b - - 1 20 | g4d1 d3h7 | 789 | 78 | 84 | 324 | kingsideAttack mate mateIn1 middlegame oneMove | https://lichess.org/e5PCEdCv/black#40 | null | null | 1 |
PDmOB | 4R2k/1p4pB/p5bp/8/P4qP1/1Q5P/5P1b/7K b - - 6 36 | h8h7 b3g8 | 698 | 87 | 89 | 211 | endgame mate mateIn1 oneMove | https://lichess.org/AvfmzNK4/black#72 | null | null | 1 |
pUuNn | 5rk1/ppp2ppp/5q2/5b2/8/5Q2/PBP2PPP/3rR1K1 w - - 0 21 | b2f6 d1e1 | 794 | 90 | 97 | 729 | backRankMate endgame hangingPiece mate mateIn1 oneMove | https://lichess.org/4xejG0eo#41 | null | null | 1 |
iZsEV | r2Q2kr/pp5p/5p1B/4p1PR/1b6/2p2P2/PPb3P1/n1K2B2 b - - 0 20 | a8d8 f1c4 d8d5 c4d5 | 747 | 89 | 96 | 2,505 | bodenMate mate mateIn2 middlegame short | https://lichess.org/7hBiE9jK/black#40 | null | null | 1 |
kJgHk | 2r2k2/3nb1p1/pq3r1p/1p1BppBQ/3R4/P3P1P1/1PP2P1P/R5K1 b - - 2 22 | h6g5 h5h8 | 675 | 81 | 100 | 274 | mate mateIn1 middlegame oneMove | https://lichess.org/aXgWv8Xp/black#44 | null | null | 1 |
dvh1W | r4rk1/ppp2ppp/2pb4/6Nq/1P4b1/2PQ1NP1/P4P1P/R3R1K1 b - - 6 18 | h7h6 d3h7 | 662 | 87 | 100 | 531 | mate mateIn1 middlegame oneMove | https://lichess.org/C6WWG6dA/black#36 | Scotch_Game Scotch_Game_Paulsen_Attack | null | 1 |
K1Ugv | 3rr1k1/ppQ2pp1/2b5/6b1/6n1/2N2N2/PPP2PP1/2K1R3 w - - 0 17 | f3g5 e8e1 c3d1 e1d1 | 726 | 78 | 97 | 662 | hangingPiece mate mateIn2 middlegame queensideAttack short | https://lichess.org/xNwrpkVi#33 | Philidor_Defense Philidor_Defense_Exchange_Variation | null | 1 |
SdOo1 | 6Qk/4P1pp/p4p2/1p1p1P2/2p5/2q4P/P1P3P1/5BK1 b - - 0 30 | h8g8 e7e8q | 635 | 82 | 100 | 475 | advancedPawn endgame mate mateIn1 oneMove promotion | https://lichess.org/2XyidICp/black#60 | null | null | 1 |
hgWGC | r1b1k1r1/pp1p1p1p/4p3/5q2/2Pnn3/P3PNP1/1P3P1P/R2QKB1R w KQq - 0 13 | f3d4 f5f2 | 674 | 90 | 71 | 434 | attackingF2F7 mate mateIn1 middlegame oneMove | https://lichess.org/zEhPtkfH#25 | Nimzo-Indian_Defense Nimzo-Indian_Defense_Hubner_Variation | null | 1 |
UGCHB | 2r3k1/1q3p1p/b1r1p1p1/p2NR3/3Q4/1P4P1/PP3P1P/4R1K1 b - - 0 27 | e6d5 e5e8 c8e8 e1e8 | 689 | 76 | 100 | 932 | kingsideAttack mate mateIn2 middlegame short | https://lichess.org/Tc4ctfeD/black#54 | null | null | 1 |
OgrPR | r3k2r/1p2bppp/p1p2n2/5P2/3pP3/q2P3P/bPPNQ1P1/2KR1B1R w kq - 0 18 | b2a3 e7a3 | 732 | 82 | 86 | 296 | doubleBishopMate mate mateIn1 middlegame oneMove queensideAttack | https://lichess.org/l9hYrfzt#35 | Kings_Pawn_Game Kings_Pawn_Game_Kings_Head_Opening | null | 1 |
wHPAK | r3k2r/1p2qpbp/p2p2p1/2pPp3/2Pn2PP/PP1PQ3/3B1PB1/1R2K2R w Kkq - 3 26 | d2c3 d4c2 e1d2 c2e3 | 799 | 89 | 91 | 220 | crushing fork middlegame short | https://lichess.org/gg7FqZqf#51 | null | null | 1 |
zGhvU | 1r2kb1r/3p1ppp/p3N3/8/1p3N1q/7b/PPPQ1P1P/2KR2R1 b k - 0 15 | f7e6 d2d7 | 602 | 85 | 100 | 216 | mate mateIn1 middlegame oneMove | https://lichess.org/bzC2i8JV/black#30 | Sicilian_Defense Sicilian_Defense_Kan_Variation | null | 1 |
yokJ4 | 2krr3/pp3ppp/2p5/5P2/2n1N3/7P/PPP2K2/R3R3 b - - 4 24 | c4d2 e4d6 d8d6 e1e8 | 780 | 80 | 98 | 1,226 | advantage deflection discoveredAttack endgame master queensideAttack short | https://lichess.org/DQW0JKLl/black#48 | null | null | 1 |
RQinV | r1b3k1/ppq4p/2p2rpQ/3pb3/8/P1NB2P1/1PP2P1P/4RRK1 b - - 1 18 | e5c3 e1e8 f6f8 e8f8 | 778 | 85 | 92 | 834 | killBoxMate kingsideAttack mate mateIn2 middlegame short | https://lichess.org/03EEiJJY/black#36 | French_Defense French_Defense_Paulsen_Variation | null | 1 |
Hr0bF | 8/7r/p1p2k2/P1Np4/1P1P1K2/2P1RP2/6r1/8 w - - 3 55 | c5a6 h7h4 | 705 | 86 | 91 | 290 | endgame master mate mateIn1 oneMove | https://lichess.org/xivYDAy6#109 | null | null | 1 |
jp6jA | 4Q1B1/1pp3b1/4RqRk/2pP3p/2n2r2/p4p1P/PP3P2/1K6 b - - 1 32 | f6g6 e6g6 | 626 | 78 | 100 | 435 | mate mateIn1 middlegame oneMove pillsburysMate | https://lichess.org/exDr1pvn/black#64 | null | null | 1 |
jjfQB | r2q2k1/1p4r1/p4b2/3b4/1P1RNp2/P6P/4QPP1/R5K1 w - - 1 28 | e4f6 d8f6 d4d5 f6a1 | 670 | 80 | 100 | 219 | advantage middlegame short | https://lichess.org/dIk1fnVR#55 | null | null | 1 |
FfYMG | r3r1k1/pppq1ppp/3b1n2/8/8/2N3Q1/PPP2PPP/R1B1R1K1 w - - 7 14 | g3f3 e8e1 | 775 | 80 | 98 | 594 | hangingPiece kingsideAttack mate mateIn1 middlegame oneMove | https://lichess.org/2T015Kk3#27 | Ruy_Lopez Ruy_Lopez_Steinitz_Defense | null | 1 |
07dk5 | rnbqk2r/ppp2ppp/3p4/2b1p3/2B1P3/4NQ1P/PPPP1nP1/R1B1K1NR b KQkq - 1 7 | c5e3 f3f7 | 718 | 81 | 100 | 222 | attackingF2F7 mate mateIn1 oneMove opening | https://lichess.org/3BAjbB1w/black#14 | Kings_Pawn_Game Kings_Pawn_Game_Napoleon_Attack | null | 1 |
8jomO | 8/6k1/5pp1/2P4p/5q2/2Q4P/8/7K b - - 0 43 | f4e5 c3e5 f6e5 c5c6 g7f6 c6c7 | 782 | 81 | 100 | 281 | advancedPawn crushing endgame long queenEndgame | https://lichess.org/JCv7qCs6/black#86 | null | null | 1 |
GgKRk | R7/2pQ2pp/1p4k1/5pB1/8/3P2Pq/1PP1rP1P/6K1 w - - 1 28 | g5e3 e2e1 | 776 | 85 | 100 | 292 | endgame mate mateIn1 oneMove | https://lichess.org/dtZCa2UK#55 | null | null | 1 |
bhzel | 3r4/1bQ1n3/p1q3kp/1p2ppp1/3p4/P2P4/BPP2PPP/3R1RK1 w - - 2 25 | c7d8 c6g2 | 693 | 86 | 67 | 216 | kingsideAttack mate mateIn1 middlegame oneMove | https://lichess.org/cXCDDSuC#49 | null | null | 1 |
yngqo | 2r3k1/pp1nbpp1/1r2p1n1/q2pP1N1/3P1N1P/P2Q4/KP3PP1/2BR3R b - - 2 21 | g6f4 d3h7 g8f8 h7h8 | 698 | 76 | 100 | 216 | kingsideAttack mate mateIn2 middlegame short | https://lichess.org/ay243zqt/black#42 | null | null | 1 |
FiUNN | r2qk2r/pp3ppb/2p1pn1p/2PB4/3P3N/B4Q2/P1P3PP/3R1RK1 b kq - 0 17 | f6d5 f3f7 | 771 | 87 | 84 | 300 | attackingF2F7 mate mateIn1 middlegame oneMove | https://lichess.org/Uux7uodw/black#34 | Blackmar-Diemer_Gambit Blackmar-Diemer_Gambit_Zeller_Defense | null | 1 |
wKJcC | 3b4/1p4n1/p5kN/2p1P1p1/3p2P1/P6P/1PPB3K/8 w - - 1 37 | h6f5 g7f5 g4f5 g6f5 | 773 | 83 | 87 | 368 | crushing endgame short | https://lichess.org/ldW2DzHJ#73 | null | null | 1 |
XIldU | 8/6P1/p1k5/8/6K1/2p4R/P7/1r6 b - - 6 46 | b1g1 h3g3 g1g3 g4g3 | 745 | 86 | 100 | 250 | crushing defensiveMove endgame master masterVsMaster rookEndgame short | https://lichess.org/jrRdUw7q/black#92 | null | null | 1 |
cBvys | 4r1k1/p2r1pp1/3P4/4q3/7R/1P3Q2/P6P/5R1K b - - 0 29 | d7d6 f3f7 | 754 | 76 | 100 | 201 | endgame mate mateIn1 oneMove | https://lichess.org/L44zC8Fq/black#58 | null | null | 1 |
pVvxu | 4rk2/1p3p2/p1p2Kpp/8/1PP2PPP/2P5/8/3rR3 w - - 0 29 | e1d1 e8e6 | 610 | 89 | 100 | 220 | endgame master masterVsMaster mate mateIn1 oneMove rookEndgame | https://lichess.org/k54Msls8#57 | null | null | 1 |
i7xGi | 2r2rk1/1b3ppp/pp3q2/3B2N1/Pb1nQB2/8/1P3PPP/2R2RK1 b - - 8 18 | b7d5 e4h7 | 778 | 85 | 97 | 273 | kingsideAttack mate mateIn1 middlegame oneMove | https://lichess.org/C6IUxuq9/black#36 | Queens_Gambit_Declined Queens_Gambit_Declined_Harrwitz_Attack | null | 1 |
Ctpv0 | 3rr1k1/p4pp1/2qbn2p/1pp5/4R2N/4Q1P1/PP1B1P1P/4R1K1 b - - 1 22 | e6g5 e4e8 d8e8 e3e8 c6e8 e1e8 | 632 | 79 | 100 | 241 | crushing kingsideAttack long middlegame | https://lichess.org/9B5XmWJM/black#44 | null | null | 1 |
zCjcd | r5k1/5p2/5n1p/q5p1/1N1Q4/1PP2P2/1P2r1PP/1K1R3R w - - 1 29 | d4f6 a5a1 | 757 | 78 | 83 | 286 | mate mateIn1 middlegame oneMove | https://lichess.org/CnxfAKGy#57 | null | null | 1 |
7GWVV | 8/1pp4k/p2p4/PP2pq2/2P1NbPp/5R2/4RK2/8 b - - 0 34 | f5g4 e4f6 h7g6 f6g4 | 716 | 89 | 100 | 607 | crushing endgame fork short | https://lichess.org/KERKJo12/black#68 | null | null | 1 |
yRuA4 | r2r2k1/pNq1nppp/2pRp3/4P3/5P2/6P1/PPQ3BP/3R2K1 b - - 0 25 | c7b7 d6d8 a8d8 d1d8 | 772 | 78 | 100 | 566 | kingsideAttack mate mateIn2 middlegame short | https://lichess.org/iZuXjzhF/black#50 | null | null | 1 |
46XQA | 8/8/p7/2N1p3/1pP5/1PqP2P1/P3K1k1/8 b - - 2 60 | g2g3 c5e4 g3f4 e4c3 | 792 | 77 | 100 | 332 | crushing endgame fork short | https://lichess.org/soDhge99/black#120 | null | null | 1 |
zYe6G | r3kb1r/1p3ppp/2p1p3/p2q4/1n1P2P1/2B2N1P/PPP1QP2/1KR4R w kq - 1 17 | f3e5 d5a2 | 650 | 78 | 100 | 314 | mate mateIn1 middlegame oneMove queensideAttack | https://lichess.org/eAxpC6Av#33 | Scandinavian_Defense Scandinavian_Defense_Modern_Variation | null | 1 |
xPaIB | 2r3k1/2qrbpp1/p1n1p2p/4P3/1P1P4/2Q1BN1P/2R2PP1/2R3K1 b - - 0 33 | c6b4 c3c7 d7c7 c2c7 | 637 | 81 | 85 | 339 | crushing middlegame short | https://lichess.org/Jc6vAhAz/black#66 | null | null | 1 |
guODm | 8/p4kb1/4p2K/7R/5P2/5Np1/PP5r/8 w - - 4 42 | h6h7 h2h5 | 630 | 80 | 100 | 250 | endgame hangingPiece mate mateIn1 oneMove | https://lichess.org/WvjkJPIK#83 | null | null | 1 |
x9cLr | 2kr3r/ppq2pp1/2p1p1b1/2P4p/1P1P2nP/P3PN2/4B1Pb/R3QRKN w - - 1 18 | f3h2 c7h2 | 671 | 78 | 100 | 438 | kingsideAttack mate mateIn1 middlegame oneMove | https://lichess.org/eP8mQwZB#35 | Caro-Kann_Defense Caro-Kann_Defense_Classical_Variation | null | 1 |
yvDIB | 3k1b2/7p/2N1PP2/3K4/1p6/6p1/8/8 b - - 1 52 | d8e8 f6f7 | 730 | 80 | 88 | 282 | advancedPawn endgame master mate mateIn1 oneMove | https://lichess.org/WjNgfQNZ/black#104 | null | null | 1 |
Xh7BL | 4R2Q/pqrk1p2/1p1p2p1/8/1P6/P3P1P1/5P2/6K1 w - - 6 36 | b4b5 c7c1 g1h2 b7h1 | 772 | 77 | 100 | 245 | endgame mate mateIn2 short | https://lichess.org/Ma5JyfIr#71 | null | null | 1 |
0ll4J | r1b5/ppp2k1p/8/5p2/3n1B2/3P4/P1PN1PPP/R5K1 w - - 1 19 | c2c3 d4e2 g1f1 e2f4 | 776 | 84 | 92 | 209 | advantage endgame fork short | https://lichess.org/kFQgUDMs#37 | null | null | 1 |
xunO7 | 2kr3r/pp1n1pp1/2p3p1/q2N4/1b3B2/5N1P/PP3PP1/R2QR1K1 b - - 0 16 | b4e1 d5e7 | 986 | 75 | 99 | 631 | mate mateIn1 middlegame oneMove | https://lichess.org/vzmMsLPg/black#32 | Scandinavian_Defense Scandinavian_Defense_Mieses-Kotroc_Variation | null | 2 |
678B8 | 4r2k/2RQ3p/pp3b2/3pp3/P6q/1P6/2P3P1/6K1 b - - 1 38 | e5e4 d7e8 | 875 | 80 | 100 | 224 | endgame hangingPiece mate mateIn1 oneMove | https://lichess.org/B9SwDTqE/black#76 | null | null | 2 |
fWD1O | r5k1/pppq1p1p/3b2pB/6N1/3Q2b1/2P5/PP3PPP/R5K1 b - - 2 19 | d6h2 g1h2 d7d4 c3d4 | 837 | 78 | 90 | 254 | advantage hangingPiece middlegame short | https://lichess.org/8qjxhKDc/black#38 | null | null | 2 |
KAcy5 | 1q4k1/5p2/1p6/p1r5/P3Q1pP/1P3nP1/4R3/4R2K w - - 7 45 | e1f1 b8g3 e4g4 g3g4 | 879 | 80 | 96 | 279 | advantage endgame master short | https://lichess.org/UW8Iq6lZ#89 | null | null | 2 |
ElmRv | 8/3kn1Q1/1p4P1/3p2n1/P7/4P3/8/6K1 w - - 1 48 | g7e5 g5f3 g1f2 f3e5 | 932 | 87 | 98 | 434 | crushing endgame fork master short | https://lichess.org/AkJv08Dz#95 | null | null | 2 |
nh5UN | r4b2/pppkp1p1/n7/1Q1pB3/3P4/2N2P1q/PPP1P3/R3K3 b Q - 5 17 | d7c8 b5e8 | 980 | 76 | 100 | 305 | mate mateIn1 middlegame oneMove | https://lichess.org/Me1c9G6P/black#34 | Dutch_Defense Dutch_Defense_Krejcik_Gambit | null | 2 |
X1CIW | 8/8/1p2k1p1/1Pp4p/p1P1KP1P/P4P2/8/8 w - - 0 40 | e4e3 e6f5 e3e2 f5f4 | 908 | 80 | 88 | 268 | crushing endgame pawnEndgame short zugzwang | https://lichess.org/DCmC2Bn7#79 | null | null | 2 |
DG4eV | 2kr3r/1pp3pp/p1p2p2/8/3PPnq1/4QN2/PP1N1P2/R4R1K w - - 2 18 | f3h2 g4g2 | 884 | 78 | 88 | 242 | mate mateIn1 middlegame oneMove | https://lichess.org/PZWlkplC#35 | Ruy_Lopez Ruy_Lopez_Exchange_Variation | null | 2 |
CF8sL | 7k/1b4r1/p2pQ3/1p3p1p/5R2/2N1P2P/PPP3PK/4q3 w - - 5 30 | c3d5 e1g3 h2g1 g3g2 | 979 | 77 | 100 | 427 | endgame mate mateIn2 short | https://lichess.org/OpNZYqtw#59 | null | null | 2 |
qCJeI | 1k1r1b2/pp3pp1/2p1pn1r/Q6P/3P1q2/2N5/PPP1B3/1K1R2R1 b - - 8 21 | f6d5 a5d8 | 870 | 88 | 100 | 558 | hangingPiece master mate mateIn1 middlegame oneMove queensideAttack | https://lichess.org/Uxl4Natq/black#42 | null | null | 2 |
xD5hE | r4rk1/2q1bR2/p1b1p1pp/1p1nP3/4Q2B/1NPB4/PP4PP/R5K1 b - - 0 18 | g8f7 e4g6 | 943 | 81 | 90 | 553 | mate mateIn1 middlegame oneMove | https://lichess.org/pZ4fAbTx/black#36 | Sicilian_Defense Sicilian_Defense_Kan_Variation | null | 2 |
Ehcee | 6k1/5p1p/p5p1/4r3/8/3r1P1P/5PK1/R1R5 w - - 0 28 | a1a6 e5g5 g2h2 d3f3 | 842 | 81 | 88 | 225 | crushing deflection endgame master rookEndgame short | https://lichess.org/kVcAT2zB#55 | null | null | 2 |
Ukk6A | 8/6p1/2q3k1/1b1NRp1p/3K1P1P/6P1/8/8 b - - 11 76 | b5f1 d5e7 g6f7 e7c6 | 870 | 81 | 98 | 927 | crushing endgame fork master short | https://lichess.org/JJTvIIVI/black#152 | null | null | 2 |
PfVUZ | 4r1k1/1bp2p2/pp1p2pp/3P4/2Pq1P2/3BR3/PPQ3PP/5RK1 w - - 1 21 | f1f3 e8e3 f3e3 d4e3 | 974 | 75 | 95 | 401 | advantage kingsideAttack middlegame short | https://lichess.org/1kcsnVI5#41 | null | null | 2 |
AYj5j | r1b2r2/pp4p1/1qn1p1k1/3p2Nn/1b1P1P2/2NQ4/PP4PP/R1B1K2R b KQ - 3 16 | g6h6 d3h7 | 826 | 77 | 100 | 544 | mate mateIn1 middlegame oneMove | https://lichess.org/Wm7BsAuC/black#32 | French_Defense French_Defense_Schlechter_Variation | null | 2 |
nz83O | 3k2r1/p1b4p/4R3/nr1N4/8/5P1P/5P2/3R1K2 b - - 2 38 | d8c8 d5e7 c8b7 e7g8 | 825 | 83 | 84 | 398 | advantage fork middlegame short | https://lichess.org/NDBa9hvk/black#76 | null | null | 2 |
End of preview. Expand in Data Studio
Knight School chess puzzles
Eval sets, RL training positions with Stockfish reward tables, and a sample of the teacher-free chess primer from Knight School. Models: nikext.
| File | What |
|---|---|
evals/test2000.csv |
2,000 held-out Lichess puzzles (Lichess columns + rating_bin), stratified over 12 rating bins 400–2799, split from training by game |
evals/dev500.csv |
500 dev puzzles, same construction |
evals/test500.ids |
500-id subset of test2000 (Gemini baselines) |
evals/probe500.csv |
E0 knowledge probe: 500 board-reading questions (square, legal-move count, FEN after a move, in check) |
rl_train/rl_train.parquet |
66,008 solver positions from Lichess puzzles, each with every legal move's Stockfish 19 score at 1M nodes (cp, mate, win probability wp, aligned with legal_san) |
primer/sample.jsonl |
250 examples per primer task (T1–T8) from primer-M + T8, chat format |
primer/manifest.json |
the full primer's build manifest: 1,326,000 examples (T1 130,502, T2 195,590, T3 195,136, T4 130,107, T5 389,918, T6 129,617, T7 129,130, T8 26,000), 0 contamination hits |
The full primer (1.3M examples) is not uploaded: make data regenerates it from the repo
(python-chess + Stockfish 19, seeded), and the manifest's sha256 checks the result.
No LLM-generated data: puzzles are Lichess's, answers come from python-chess or Stockfish. Contamination: no training or primer position shares a position key (or a source game) with any eval set; a CI test enforces it on the committed eval keys.
License: CC0, as the Lichess puzzle and evaluation databases it derives from. The ChessBench subset used in the project is not included (its license was not verified).
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