List of TCEC and CCC Hard Test Positions

[rj329]

Hello all,

The following is a list of difficult test positions from the TCEC and CCC chess tournaments. All of these positions are from the last 2 years and do not contain alternative moves:

Code: Select all

4qrk1/3bpp1p/p2p2p1/n1pP4/r1P1P2P/3Qb1P1/P1RB1PBK/1R6 w - - bm Bxa5;
1r1qr1k1/6bp/1n1p2p1/2pP1p2/1n2PP2/1QN5/1P1N2PP/R4RBK w - - bm e5;
5rk1/pp3pb1/2n3pp/2p5/P2pRN1P/8/1qP1QPP1/3R2K1 w - - bm Re8;
1r2r1k1/pb3p1p/2p3p1/1pq2P2/2pRP1PP/P7/1P3QB1/3R2K1 w - - bm h5;
r1b5/1pk2pr1/1Rp1p1q1/p1PpPp1p/P2P1Q1P/4P1P1/4B1K1/3R4 w - - bm e5;
r4rk1/pbq1bppp/1pn1p3/3pP3/NP3P2/P1PB4/5BPP/2RQ1RK1 w - - bm c4;
3r1rk1/1bqn1pnp/p1pb4/1p2p1P1/P3P3/2NB1N2/1PPBQ2P/4RR1K w - - bm Nh4;
8/3p4/p2kp1N1/p1r4p/P6P/5RK1/8/8 w - - bm Kf4;
rn2kbnr/pp3pp1/4p3/3pP1Bp/2pP3P/2P5/Pq2NPP1/RN1Q1RK1 b kq - - bm Qxa1;
r4rk1/pp2bppp/3pbn2/q3p1B1/4PP1P/2N1Q3/PPP3P1/2KR1B1R w - - bm f5;
2rr4/pppn1p1k/1n1p2pb/3Pp2p/4P2P/2N2P2/PP4R1/3R1QK1 w - - bm Rc2;
r3r3/ppp3kp/3p4/3P1Bp1/1PP1b3/4P3/P3K1PP/3R1R2 b - - bm Bxg2;
r4rk1/ppp1bppp/2p5/4P3/8/1q2B3/PPPR1PPP/3R2K1 w - - bm cxb2;
1r3n2/5k1p/p2p2p1/P4p2/2PP1P1P/6P1/2K1R3/4B3 w - - bm d5;
r2k1n2/pp1n4/2p5/5q2/N5p1/6Q1/PP4B1/K3R3 w - - bm Rd1;
2rr2k1/p7/1p2p2p/4P1q1/6P1/3R3P/PP6/4QRK1 w - - bm Qe4;
4bq2/1r4pk/r3p2n/1n1pPpB1/2pP3Q/p1P2P1B/R1P1NK2/6R1 w - - bm Raa1;
4r1k1/1b4b1/p3p1pp/2qpBn2/2p5/5N2/P4PPP/2RQR1K1 w - - bm Bxg7;
1r2k3/1q1nbp1p/2rp1npP/1p2p1B1/pP2P3/P1NR1RP1/2PN1P2/3Q2K1 w - - bm Nd5;
5r2/1p1kbp2/p1qp2p1/3Qp1P1/4P3/P4P1R/1PP5/1K3B2 w - - bm Qd2;
4q3/6r1/p2p2pk/1p1Pb2p/4Q3/P5R1/1PP5/1K4R1 w - - bm Rg5;
r2qr1k1/1b1n1pbp/pp2p1p1/7P/1B1PP3/R2BQN2/5PP1/1R4K1 w - - bm h6;
2n2rk1/1p1r1q2/p2p2p1/Q2Pp2p/5p1P/3B1Pn1/PPP2BP1/1K1RR3 w - - bm Bxg3;
4n1k1/1p1q4/pP1p1pp1/1r1P3p/2N1P3/1P3Q1P/5RP1/6K1 w - - bm e5;
3r4/pp4kp/P1q3p1/2p1bpPP/2r1p3/R7/1PB3Q1/2B1R2K w - - bm Bb3;
2r5/p1rq1k1p/Pnp1pbp1/1p3p2/3PPP2/1P1BBP2/2R4P/3R2QK w - - bm h4;
8/p3r2k/Pp2q3/2pQ4/K1P2p2/1P6/7P/3R4 w - - bm Rd2;
1r3k2/2r4p/2Pq2pP/3P1p2/2B1p3/p3Q1P1/Rb3PK1/3R4 w - - bm Rxb2;
1r1q1r2/pp3pbk/3p2pp/2pPp3/P1P1P1BP/Q1Nn4/1P1B1P2/2KR3R w - bm Kc2;
5rk1/p2n1p2/2qPp1p1/2p4p/4N2P/8/r1P1QPP1/3RR1K1 w - - bm g4;
1r4k1/q3pp1p/3p1np1/1PpP4/n3PP2/P3N3/R1QB2PP/6K1 w - - bm e5;
4k2r/1q1n1p2/r2b2p1/1ppPp3/p3P1Np/1P4P1/PB2QP1P/2R2R1K w k - - bm Kg2;
r1b1k2r/2p2pbp/3p2p1/2pPp3/p3P2Q/nP3PN1/P4K1P/3R3R w kq - - bm Nh5;
1r1q1rk1/6n1/2p1p2p/2PpN2b/Q2P1pp1/P5P1/1P3P1B/1R2R1K1 b - - bm f3;
r1b2rkb/1p1nq2p/2p1pn1P/p2p1p2/3P1Bp1/2PN1PP1/PP2P1B1/RN1QK2R w KQ - - bm Qd2;
7k/4nr1p/5p2/4pP2/b2p2P1/8/2PB2BP/1R4K1 w - - bm Bh6;
2r2rk1/2P3p1/1p2b1pp/p1n1B3/1p5P/6P1/P4PB1/R2R2K1 w - - bm Rac1;

Here is the EPD file: https://drive.google.com/file/d/1Qu4YKI ... sp=sharing

[Vinvin]

Thanks for this set !

r1b5/1pk2pr1/1Rp1p1q1/p1PpPp1p/P2P1Q1P/4P1P1/4B1K1/3R4 w - - bm e5;

but e5 is not possible in this position.

[Lazy_Frank]

[fen]rn2kbnr/pp3pp1/4p3/3pP1Bp/2pP3P/2P5/Pq2NPP1/RN1Q1RK1 b kq - -[/fen]
Best move : Qxa1.

If you mean best drawing move, then i can agree.

[fen]2kr3r/pp2npp1/2n1p3/3pP2p/2pP3P/2P5/PQ2NPP1/5NK1 w - - 0 17 [/fen]

Stockfish here played 17. a4 which is strategically wrong.

17. Nf4 Kc7 18. Nh3 Rd7 19. Ng5(!)

[fen]7r/ppkrnpp1/2n1p3/3pP1Np/2pP3P/2P5/PQ3PP1/5NK1 b - - 5 19 [/fen]

[rj329]

Hello Vinvin, thanks for the correction.

Here is the updated EPD file with the correction and 5 more positions: https://drive.google.com/file/d/1q2aQjn ... sp=sharing

Code: Select all

4qrk1/3bpp1p/p2p2p1/n1pP4/r1P1P2P/3Qb1P1/P1RB1PBK/1R6 w - - bm Bxa5;
1r1qr1k1/6bp/1n1p2p1/2pP1p2/1n2PP2/1QN5/1P1N2PP/R4RBK w - - bm e5;
5rk1/pp3pb1/2n3pp/2p5/P2pRN1P/8/1qP1QPP1/3R2K1 w - - bm Re8;
1r2r1k1/pb3p1p/2p3p1/1pq2P2/2pRP1PP/P7/1P3QB1/3R2K1 w - - bm h5;
r1b5/1pk2pr1/1Rp1p1q1/p1PpPp1p/P2P1Q1P/4P1P1/4B1K1/3R4 w - - bm e4;
r4rk1/pbq1bppp/1pn1p3/3pP3/NP3P2/P1PB4/5BPP/2RQ1RK1 w - - bm c4;
3r1rk1/1bqn1pnp/p1pb4/1p2p1P1/P3P3/2NB1N2/1PPBQ2P/4RR1K w - - bm Nh4;
8/3p4/p2kp1N1/p1r4p/P6P/5RK1/8/8 w - - bm Kf4;
rn2kbnr/pp3pp1/4p3/3pP1Bp/2pP3P/2P5/Pq2NPP1/RN1Q1RK1 b kq - - bm Qxa1;
r4rk1/pp2bppp/3pbn2/q3p1B1/4PP1P/2N1Q3/PPP3P1/2KR1B1R w - - bm f5;
2rr4/pppn1p1k/1n1p2pb/3Pp2p/4P2P/2N2P2/PP4R1/3R1QK1 w - - bm Rc2;
r3r3/ppp3kp/3p4/3P1Bp1/1PP1b3/4P3/P3K1PP/3R1R2 b - - bm Bxg2;
r4rk1/ppp1bppp/2p5/4P3/8/1q2B3/PPPR1PPP/3R2K1 w - - bm cxb2;
1r3n2/5k1p/p2p2p1/P4p2/2PP1P1P/6P1/2K1R3/4B3 w - - bm d5;
r2k1n2/pp1n4/2p5/5q2/N5p1/6Q1/PP4B1/K3R3 w - - bm Rd1;
2rr2k1/p7/1p2p2p/4P1q1/6P1/3R3P/PP6/4QRK1 w - - bm Qe4;
4bq2/1r4pk/r3p2n/1n1pPpB1/2pP3Q/p1P2P1B/R1P1NK2/6R1 w - - bm Raa1;
4r1k1/1b4b1/p3p1pp/2qpBn2/2p5/5N2/P4PPP/2RQR1K1 w - - bm Bxg7;
1r2k3/1q1nbp1p/2rp1npP/1p2p1B1/pP2P3/P1NR1RP1/2PN1P2/3Q2K1 w - - bm Nd5;
5r2/1p1kbp2/p1qp2p1/3Qp1P1/4P3/P4P1R/1PP5/1K3B2 w - - bm Qd2;
4q3/6r1/p2p2pk/1p1Pb2p/4Q3/P5R1/1PP5/1K4R1 w - - bm Rg5;
r2qr1k1/1b1n1pbp/pp2p1p1/7P/1B1PP3/R2BQN2/5PP1/1R4K1 w - - bm h6;
2n2rk1/1p1r1q2/p2p2p1/Q2Pp2p/5p1P/3B1Pn1/PPP2BP1/1K1RR3 w - - bm Bxg3;
4n1k1/1p1q4/pP1p1pp1/1r1P3p/2N1P3/1P3Q1P/5RP1/6K1 w - - bm e5;
3r4/pp4kp/P1q3p1/2p1bpPP/2r1p3/R7/1PB3Q1/2B1R2K w - - bm Bb3;
2r5/p1rq1k1p/Pnp1pbp1/1p3p2/3PPP2/1P1BBP2/2R4P/3R2QK w - - bm h4;
8/p3r2k/Pp2q3/2pQ4/K1P2p2/1P6/7P/3R4 w - - bm Rd2;
1r3k2/2r4p/2Pq2pP/3P1p2/2B1p3/p3Q1P1/Rb3PK1/3R4 w - - bm Rxb2;
1r1q1r2/pp3pbk/3p2pp/2pPp3/P1P1P1BP/Q1Nn4/1P1B1P2/2KR3R w - bm Kc2;
5rk1/p2n1p2/2qPp1p1/2p4p/4N2P/8/r1P1QPP1/3RR1K1 w - - bm g4;
1r4k1/q3pp1p/3p1np1/1PpP4/n3PP2/P3N3/R1QB2PP/6K1 w - - bm e5;
4k2r/1q1n1p2/r2b2p1/1ppPp3/p3P1Np/1P4P1/PB2QP1P/2R2R1K w k - - bm Kg2;
r1b1k2r/2p2pbp/3p2p1/2pPp3/p3P2Q/nP3PN1/P4K1P/3R3R w kq - - bm Nh5;
1r1q1rk1/6n1/2p1p2p/2PpN2b/Q2P1pp1/P5P1/1P3P1B/1R2R1K1 b - - bm f3;
r1b2rkb/1p1nq2p/2p1pn1P/p2p1p2/3P1Bp1/2PN1PP1/PP2P1B1/RN1QK2R w KQ - - bm Qd2;
7k/4nr1p/5p2/4pP2/b2p2P1/8/2PB2BP/1R4K1 w - - bm Bh6;
2r2rk1/2P3p1/1p2b1pp/p1n1B3/1p5P/6P1/P4PB1/R2R2K1 w - - bm Rac1;
1rnq2k1/pp3rb1/P2p2p1/3Pp1Pp/1QP1PnbP/2N1B1R1/3N4/1R2KB2 w - - bm axb7;
2rqr1k1/pp1bbp1p/2n1p1pB/2N1P3/1PQp4/P4N2/5PP1/3RR1K1 w - - bm Ne4;
2r4k/3R1p2/2P3Rp/1p5P/1P3rp1/P7/3K4/8 w - - bm Rxh6;
7k/4q1pp/3bP3/3p3P/Bp1P1r2/p2R4/2P3P1/K3Q3 b - - bm Qf6;
r3k1nr/p2q2bp/Rp2ppp1/3pP1N1/3P1Q2/1PP3N1/5PPP/2R3K1 w kq - - bm N5e4;

rn2kbnr/pp3pp1/4p3/3pP1Bp/2pP3P/2P5/Pq2NPP1/RN1Q1RK1 b kq - -
Best move : Qxa1.

If you mean best drawing move, then i can agree.

Code: Select all

71/89	6:01:53	129,925,856k	5,984k	+1.95	Qb2xa1 Qd1-c2 Nb8-c6 Nb1-d2 Qa1xf1+ Kg1xf1 Bf8-e7 Qc2-b2 Ra8-b8 a2-a4 Be7xg5 h4xg5 Ng8-e7 Nd2-f3 g7-g6 Nf3-h4 Rh8-g8 f2-f4 Ke8-d7 Qb2-a3 Rb8-e8 g2-g3 a7-a6 Kf1-g2 Re8-d8 f4-f5 g6xf5 Nh4-f3 Ne7-g6 Qa3-c1 Kd7-c8 Nf3-h4 Nc6-e7 Qc1-a3 Kc8-b8 Kg2-f3 Ne7-c6 Qa3-c1 Rd8-c8 Kf3-f2 Rc8-e8 Nh4xg6 Rg8xg6 Ne2-f4 Rg6-g7 Kf2-f3 Rg7-h7 Qc1-a3 Kb8-c8 Qa3-c5 h5-h4 g3xh4 Rh7xh4 Qc5-d6 Rh4-h7 Qd6-c5 Rh7-h8 Qc5-d6 Re8-d8 Qd6-a3 Rh8-e8 g5-g6 f7xg6 Nf4xg6 Kc8-b8 Ng6-f4 Rd8-d7 Nf4-h5 Rd7-e7 Nh5-f4 Nc6-d8 Nf4-g6 Re7-h7 Qa3-d6+ Kb8-a8

[Glarean]

.

Also, do you maybe have a link to all the databases your positions are from so that one could download the whole games?
Thanks for your work: Walter

.

[peter]

Hello all,

The following is a list of difficult test positions from the TCEC and CCC chess tournaments. All of these positions are from the last 2 years and do not contain alternative moves:

Code: Select all

4qrk1/3bpp1p/p2p2p1/n1pP4/r1P1P2P/3Qb1P1/P1RB1PBK/1R6 w - - bm Bxa5;
1r1qr1k1/6bp/1n1p2p1/2pP1p2/1n2PP2/1QN5/1P1N2PP/R4RBK w - - bm e5;
5rk1/pp3pb1/2n3pp/2p5/P2pRN1P/8/1qP1QPP1/3R2K1 w - - bm Re8;
1r2r1k1/pb3p1p/2p3p1/1pq2P2/2pRP1PP/P7/1P3QB1/3R2K1 w - - bm h5;
r1b5/1pk2pr1/1Rp1p1q1/p1PpPp1p/P2P1Q1P/4P1P1/4B1K1/3R4 w - - bm e5;
r4rk1/pbq1bppp/1pn1p3/3pP3/NP3P2/P1PB4/5BPP/2RQ1RK1 w - - bm c4;
3r1rk1/1bqn1pnp/p1pb4/1p2p1P1/P3P3/2NB1N2/1PPBQ2P/4RR1K w - - bm Nh4;
8/3p4/p2kp1N1/p1r4p/P6P/5RK1/8/8 w - - bm Kf4;
rn2kbnr/pp3pp1/4p3/3pP1Bp/2pP3P/2P5/Pq2NPP1/RN1Q1RK1 b kq - - bm Qxa1;
r4rk1/pp2bppp/3pbn2/q3p1B1/4PP1P/2N1Q3/PPP3P1/2KR1B1R w - - bm f5;
2rr4/pppn1p1k/1n1p2pb/3Pp2p/4P2P/2N2P2/PP4R1/3R1QK1 w - - bm Rc2;
r3r3/ppp3kp/3p4/3P1Bp1/1PP1b3/4P3/P3K1PP/3R1R2 b - - bm Bxg2;
r4rk1/ppp1bppp/2p5/4P3/8/1q2B3/PPPR1PPP/3R2K1 w - - bm cxb2;
1r3n2/5k1p/p2p2p1/P4p2/2PP1P1P/6P1/2K1R3/4B3 w - - bm d5;
r2k1n2/pp1n4/2p5/5q2/N5p1/6Q1/PP4B1/K3R3 w - - bm Rd1;
2rr2k1/p7/1p2p2p/4P1q1/6P1/3R3P/PP6/4QRK1 w - - bm Qe4;
4bq2/1r4pk/r3p2n/1n1pPpB1/2pP3Q/p1P2P1B/R1P1NK2/6R1 w - - bm Raa1;
4r1k1/1b4b1/p3p1pp/2qpBn2/2p5/5N2/P4PPP/2RQR1K1 w - - bm Bxg7;
1r2k3/1q1nbp1p/2rp1npP/1p2p1B1/pP2P3/P1NR1RP1/2PN1P2/3Q2K1 w - - bm Nd5;
5r2/1p1kbp2/p1qp2p1/3Qp1P1/4P3/P4P1R/1PP5/1K3B2 w - - bm Qd2;
4q3/6r1/p2p2pk/1p1Pb2p/4Q3/P5R1/1PP5/1K4R1 w - - bm Rg5;
r2qr1k1/1b1n1pbp/pp2p1p1/7P/1B1PP3/R2BQN2/5PP1/1R4K1 w - - bm h6;
2n2rk1/1p1r1q2/p2p2p1/Q2Pp2p/5p1P/3B1Pn1/PPP2BP1/1K1RR3 w - - bm Bxg3;
4n1k1/1p1q4/pP1p1pp1/1r1P3p/2N1P3/1P3Q1P/5RP1/6K1 w - - bm e5;
3r4/pp4kp/P1q3p1/2p1bpPP/2r1p3/R7/1PB3Q1/2B1R2K w - - bm Bb3;
2r5/p1rq1k1p/Pnp1pbp1/1p3p2/3PPP2/1P1BBP2/2R4P/3R2QK w - - bm h4;
8/p3r2k/Pp2q3/2pQ4/K1P2p2/1P6/7P/3R4 w - - bm Rd2;
1r3k2/2r4p/2Pq2pP/3P1p2/2B1p3/p3Q1P1/Rb3PK1/3R4 w - - bm Rxb2;
1r1q1r2/pp3pbk/3p2pp/2pPp3/P1P1P1BP/Q1Nn4/1P1B1P2/2KR3R w - bm Kc2;
5rk1/p2n1p2/2qPp1p1/2p4p/4N2P/8/r1P1QPP1/3RR1K1 w - - bm g4;
1r4k1/q3pp1p/3p1np1/1PpP4/n3PP2/P3N3/R1QB2PP/6K1 w - - bm e5;
4k2r/1q1n1p2/r2b2p1/1ppPp3/p3P1Np/1P4P1/PB2QP1P/2R2R1K w k - - bm Kg2;
r1b1k2r/2p2pbp/3p2p1/2pPp3/p3P2Q/nP3PN1/P4K1P/3R3R w kq - - bm Nh5;
1r1q1rk1/6n1/2p1p2p/2PpN2b/Q2P1pp1/P5P1/1P3P1B/1R2R1K1 b - - bm f3;
r1b2rkb/1p1nq2p/2p1pn1P/p2p1p2/3P1Bp1/2PN1PP1/PP2P1B1/RN1QK2R w KQ - - bm Qd2;
7k/4nr1p/5p2/4pP2/b2p2P1/8/2PB2BP/1R4K1 w - - bm Bh6;
2r2rk1/2P3p1/1p2b1pp/p1n1B3/1p5P/6P1/P4PB1/R2R2K1 w - - bm Rac1;

Here is the EPD file: https://drive.google.com/file/d/1Qu4YKI ... sp=sharing

Thanks for the collection!
As Walter already asked for, could you maybe provide sources of the positions too? .pgn with all full games would be even better of course, but just the headers with names and dates of rounds and tournaments would be fine also.

It's often difficult with average hardware to reproduce the moves of hight- tech one like used at TCEC, so to be fully sure as for usability as test positions, much hardware- time is necessary to judge best moves for singularity.
BTW. many of the positions are in Hiracs online abo Tournament- book already, here's the first hard one position I analysed some deeper, nr. 7:


[fen]3r1rk1/1bqn1pnp/p1pb4/1p2p1P1/P3P3/2NB1N2/1PPBQ2P/4RR1K w - - 0 1[/fen]

Analysis by Stockfish 290522:

1. +- (2.20): 1.Nh4 Nc5 2.Rf3 Bc8 3.Nf5 b4 4.Nh6+ Kh8 5.Ref1 Be6 6.Nd1 Nh5 7.Ne3 Nf4 8.Qe1 f6 9.gxf6 Rxf6 10.Nef5 Rdf8 11.Qh4 Ncxd3 12.cxd3 Bxf5 13.Nxf5 Be7 14.Qe1 Ne6 15.Qc1 Qd7 16.Qc4 Nd4 17.Bh6 R8f7 18.Nxd4 Rxf3 19.Rxf3 Rxf3 20.Nxf3 Qh3 21.Ng1 Qxh6 22.Qxa6 Qd2 23.Qc8+ Kg7 24.Qd7 Kf7
2. +/- (1.40): 1.Ra1 Nc5 2.Nd1 Qe7 3.Ne3 Bc8 4.Ba5 Bc7 5.Bb4 a5 6.Bxc5 Qxc5 7.Nh4 Kh8 8.Ng4 f5 9.Nf6 f4 10.axb5 cxb5 11.Bxb5 Qe3 12.Qf3 Bb6 13.Nd5 Qxf3+ 14.Nxf3 Rxd5 15.exd5 e4 16.Nd2 f3 17.Nxe4 Bh3 18.Rg1 Nf5 19.g6 hxg6 20.Rxg6 Bg2+ 21.Rxg2 fxg2+ 22.Kxg2 Ne3+ 23.Kh1 Rf4 24.Bd3 Nxd5 25.Rd1 Ne3 26.Re1 a4

Depth 45 in MultiPV=2 after some Forward Backward of the two best lines, that took > 15 minutes with 30 threads of 16x3.4GHz Ryzen with 32G hash, even started with full hash after preanalysis, so for sure not the best way to get the best lines, just to show two of them together with evals in direct comparison. Search tree is very broad and splits up soon. Already at second move after 1.Nh4(!) Black's candidate moves are at least 4 of them to be followed separately regards

[Vinvin]

Hello Vinvin, thanks for the correction.

Here is the updated EPD file with the correction and 5 more positions:
r4rk1/ppp1bppp/2p5/4P3/8/1q2B3/PPPR1PPP/3R2K1 w - - bm cxb2;

There still a problem with position number 13 : cxb2 is not possible. I suppose it's cxb3.

[peter]

There still a problem with position number 13 : cxb2 is not possible. I suppose it's cxb3.

Right, Vincent, thanks for pointing out. I imported the postions into .cbh at once, there's isn't any move stored at all because of the illegal notation, cxb3 will be correct:


[fen]r4rk1/ppp1bppp/2p5/4P3/8/1q2B3/PPPR1PPP/3R2K1 w - - 0 1[/fen]


Depth 40 after some Forward- Backward:

Analysis by CorChess 3 300522:

1. +- (2.09): 1.cxb3 Tfe8 2.Td7 Tac8 3.g3 b6 4.Kg2 a5 5.Ld4 Ted8 6.Lc3 Kf8 7.Txd8+ Txd8 8.Txd8+ Lxd8 9.Kf3 Ke7 10.Ke4 Ke6 11.f3 g6 12.f4 Le7 13.a4 c5 14.Le1 c6 15.g4 Kd7 16.Lg3 Ld8 17.h3 Le7 18.Lf2 Ld8 19.Le1 Ke8 20.h4 h5 21.gxh5

2. +/= (0.59): 1.axb3 f6 2.Td7 Tad8 3.Lf4 g5 4.Lg3 Txd7 5.Txd7 Td8 6.Txd8+ Lxd8 7.exf6 Lxf6 8.c3 g4 9.Lf4 Le7 10.g3 Kf7 11.h3 gxh3 12.Kh2 Kg6 13.Kxh3 Kf5 14.Lxc7 h5 15.Lb8 a6 16.b4 Lg5 17.Ld6 Lc1 18.b3 Lg5 19.Lc5 Lf6 20.Ld4 Lg5 21.f3 Le7 22.Le3 Lf6 23.Ld2 Ld8 24.g4+ hxg4+ 25.fxg4+ Ke4 26.g5

Have you seen nr.8 already, that's a good one, not only single best move but game changer and winner too:


[fen]8/3p4/p2kp1N1/p1r4p/P6P/5RK1/8/8 w - - 0 1[/fen]


1.Kf4!

Depth 40 after some Forward Backward:

Analysis by Stockfish 290522:

1. +- (7.23): 1.Kf4 Td5 2.Ke4 Tc5 3.Td3+ Kc7 4.Sf8 Kc6 5.Txd7 e5 6.Kd3 Tc1 7.Te7 Kd5 8.Sg6 Te1 9.Te8 Kd6 10.Ta8 Kc5 11.Th8 e4+ 12.Kd2 Ta1 13.Txh5+ Kb6 14.Te5 Txa4 15.Kc2 Ta2+ 16.Kb3 Ta1 17.Txe4 Tb1+ 18.Kc3 Tc1+ 19.Kb2 Th1 20.Te5 Tg1 21.Tg5 Te1 22.Td5 Te2+ 23.Kc3 Th2 24.Tg5 Th1 25.h5 Th3+ 26.Kc2 Th2+ 27.Kb3 Th3+ 28.Ka4 Th1 29.Tf5 Ta1+ 30.Kb3 a4+ 31.Kb2

2. = (0.28): 1.Td3+ Kc6 2.Se7+ Kc7 3.Kf4 Kd8 4.Sg6 Kc7 5.Tf3 Tf5+ 6.Ke3 Tc5 7.Kd2 Td5+ 8.Kc2 Kd6 9.Td3 e5 10.Te3 Td4 11.Txe5 Txa4 12.Txh5 Ke6 13.Kd2 Tg4 14.Se5 Tf4 15.Sd3 Tf5 16.Th6+ Tf6 17.Th8 a4 18.Kc2 a3 19.Kb1 d6 20.Ka2 Tf3 21.Sb4 Kf7 22.Sc6 Th3 23.Sd4 Td3 24.Sf5 Kg6 25.Se7+ Kf6 26.Th7 d5 27.h5 Th3 28.Sxd5+ Kf5

After 1.Kf4! about 40 moves to mate regards

[rj329]

Thanks again for the correction Vinvin. I have added 4 more wonderful positions with the sources (although I couldn't find all of the sources):

Code: Select all

4qrk1/3bpp1p/p2p2p1/n1pP4/r1P1P2P/3Qb1P1/P1RB1PBK/1R6 w - - bm Bxa5; id "https://tcec-chess.com/#div=sf&game=71&season=21";
1r1qr1k1/6bp/1n1p2p1/2pP1p2/1n2PP2/1QN5/1P1N2PP/R4RBK w - - bm e5; id "https://tcec-chess.com/#div=vsob21&game=528&season=21";
5rk1/pp3pb1/2n3pp/2p5/P2pRN1P/8/1qP1QPP1/3R2K1 w - - bm Re8; id "https://tcec-chess.com/#div=p&game=207&season=20";
1r2r1k1/pb3p1p/2p3p1/1pq2P2/2pRP1PP/P7/1P3QB1/3R2K1 w - - bm h5; id "https://tcec-chess.com/#div=sf&game=33&season=17";
r1b5/1pk2pr1/1Rp1p1q1/p1PpPp1p/P2P1Q1P/4P1P1/4B1K1/3R4 w - - bm e4; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=44";
r4rk1/pbq1bppp/1pn1p3/3pP3/NP3P2/P1PB4/5BPP/2RQ1RK1 w - - bm c4; id "https://tcec-chess.com/#div=sf&game=64&season=16";
3r1rk1/1bqn1pnp/p1pb4/1p2p1P1/P3P3/2NB1N2/1PPBQ2P/4RR1K w - - bm Nh4; id "https://tcec-chess.com/#div=vvltc&game=3&season=21";
8/3p4/p2kp1N1/p1r4p/P6P/5RK1/8/8 w - - bm Kf4; id "https://tcec-chess.com/#div=vsob21&game=96&season=21";
rn2kbnr/pp3pp1/4p3/3pP1Bp/2pP3P/2P5/Pq2NPP1/RN1Q1RK1 b kq - - bm Qxa1; id "https://tcec-chess.com/#div=vsob21&game=166&season=21";
r4rk1/pp2bppp/3pbn2/q3p1B1/4PP1P/2N1Q3/PPP3P1/2KR1B1R w - - bm f5; id "https://tcec-chess.com/#div=vsob21&game=331&season=21";
2rr4/pppn1p1k/1n1p2pb/3Pp2p/4P2P/2N2P2/PP4R1/3R1QK1 w - - bm Rc2; id "https://tcec-chess.com/#div=vsob21&game=361&season=21";
r3r3/ppp3kp/3p4/3P1Bp1/1PP1b3/4P3/P3K1PP/3R1R2 b - - bm Bxg2; id "https://tcec-chess.com/#game=11&round=fl&season=cup10";
r4rk1/ppp1bppp/2p5/4P3/8/1q2B3/PPPR1PPP/3R2K1 w - - bm cxb3; id "https://tcec-chess.com/#div=vsob21&game=418&season=21"; 
1r3n2/5k1p/p2p2p1/P4p2/2PP1P1P/6P1/2K1R3/4B3 w - - bm d5; id "https://tcec-chess.com/#div=sft&game=7&season=22";
r2k1n2/pp1n4/2p5/5q2/N5p1/6Q1/PP4B1/K3R3 w - - bm Rd1; id "https://tcec-chess.com/#div=sbf&game=22&season=22";
2rr2k1/p7/1p2p2p/4P1q1/6P1/3R3P/PP6/4QRK1 w - - bm Qe4; id "https://tcec-chess.com/#div=sbf&game=18&season=22";
4bq2/1r4pk/r3p2n/1n1pPpB1/2pP3Q/p1P2P1B/R1P1NK2/6R1 w - - bm Raa1; id "https://www.chess.com/computer-chess-championship#event=ccc-17-bullet-finals&game=18";
4r1k1/1b4b1/p3p1pp/2qpBn2/2p5/5N2/P4PPP/2RQR1K1 w - - bm Bxg7; id "https://www.chess.com/computer-chess-championship#event=ccc-17-bullet-finals&game=106";
1r2k3/1q1nbp1p/2rp1npP/1p2p1B1/pP2P3/P1NR1RP1/2PN1P2/3Q2K1 w - - bm Nd5; id "";
5r2/1p1kbp2/p1qp2p1/3Qp1P1/4P3/P4P1R/1PP5/1K3B2 w - - bm Qd2; id "https://tcec-chess.com/#div=sbf&game=72&season=22";
4q3/6r1/p2p2pk/1p1Pb2p/4Q3/P5R1/1PP5/1K4R1 w - - bm Rg5; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=186";
r2qr1k1/1b1n1pbp/pp2p1p1/7P/1B1PP3/R2BQN2/5PP1/1R4K1 w - - bm h6; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=202";
2n2rk1/1p1r1q2/p2p2p1/Q2Pp2p/5p1P/3B1Pn1/PPP2BP1/1K1RR3 w - - bm Bxg3; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=270";
4n1k1/1p1q4/pP1p1pp1/1r1P3p/2N1P3/1P3Q1P/5RP1/6K1 w - - bm e5; id "https://www.chess.com/computer-chess-championship#event=ccc-16-rapid-finals&game=80";
3r4/pp4kp/P1q3p1/2p1bpPP/2r1p3/R7/1PB3Q1/2B1R2K w - - bm Bb3; id "https://www.chess.com/computer-chess-championship#event=ccc-16-blitz-finals&game=272";
2r5/p1rq1k1p/Pnp1pbp1/1p3p2/3PPP2/1P1BBP2/2R4P/3R2QK w - - bm h4; id "";
8/p3r2k/Pp2q3/2pQ4/K1P2p2/1P6/7P/3R4 w - - bm Rd2; id "https://www.chess.com/computer-chess-championship#event=ccc-16-bullet-finals&game=320";
1r3k2/2r4p/2Pq2pP/3P1p2/2B1p3/p3Q1P1/Rb3PK1/3R4 w - - bm Rxb2; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=220";
1r1q1r2/pp3pbk/3p2pp/2pPp3/P1P1P1BP/Q1Nn4/1P1B1P2/2KR3R w - bm Kc2; id "";
5rk1/p2n1p2/2qPp1p1/2p4p/4N2P/8/r1P1QPP1/3RR1K1 w - - bm g4; id "https://www.chess.com/computer-chess-championship#event=ccc-16-bullet-finals&game=996";
1r4k1/q3pp1p/3p1np1/1PpP4/n3PP2/P3N3/R1QB2PP/6K1 w - - bm e5; id "https://www.chess.com/computer-chess-championship#event=ccc-16-bullet-finals&game=1046";
4k2r/1q1n1p2/r2b2p1/1ppPp3/p3P1Np/1P4P1/PB2QP1P/2R2R1K w k - - bm Kg2; id "https://www.chess.com/computer-chess-championship#event=ccc-16-bullet-finals&game=1350";
r1b1k2r/2p2pbp/3p2p1/2pPp3/p3P2Q/nP3PN1/P4K1P/3R3R w kq - - bm Nh5; id "https://www.chess.com/computer-chess-championship#event=merry-queen-sac&game=133";
1r1q1rk1/6n1/2p1p2p/2PpN2b/Q2P1pp1/P5P1/1P3P1B/1R2R1K1 b - - bm f3; id "https://www.chess.com/computer-chess-championship#event=the-hillbilly-attack&game=312";
r1b2rkb/1p1nq2p/2p1pn1P/p2p1p2/3P1Bp1/2PN1PP1/PP2P1B1/RN1QK2R w KQ - - bm Qd2; id "";
7k/4nr1p/5p2/4pP2/b2p2P1/8/2PB2BP/1R4K1 w - - bm Bh6; id "https://www.chess.com/computer-chess-championship#event=ccc-rapid-2021-finals&game=180";
2r2rk1/2P3p1/1p2b1pp/p1n1B3/1p5P/6P1/P4PB1/R2R2K1 w - - bm Rac1; id "https://www.chess.com/computer-chess-championship#event=ccc-blitz-championship-2020-finals&game=96";
1rnq2k1/pp3rb1/P2p2p1/3Pp1Pp/1QP1PnbP/2N1B1R1/3N4/1R2KB2 w - - bm axb7; id "https://tcec-chess.com/#div=sf&game=3&season=18";
2rqr1k1/pp1bbp1p/2n1p1pB/2N1P3/1PQp4/P4N2/5PP1/3RR1K1 w - - bm Ne4; id "https://tcec-chess.com/#div=sf&game=65&season=18";
2r4k/3R1p2/2P3Rp/1p5P/1P3rp1/P7/3K4/8 w - - bm Rxh6; id "https://tcec-chess.com/#div=p&game=125&season=20";
7k/4q1pp/3bP3/3p3P/Bp1P1r2/p2R4/2P3P1/K3Q3 b - - bm Qf6; id "https://tcec-chess.com/#div=sf&game=13&season=22";
r3k1nr/p2q2bp/Rp2ppp1/3pP1N1/3P1Q2/1PP3N1/5PPP/2R3K1 w kq - - bm N5e4; id "https://tcec-chess.com/#div=sf&game=92&season=19";
4r2k/3b3p/p2p1Rp1/3Bn3/1p6/1PB5/P1P5/2K5 w - - bm Bd4; id "https://www.chess.com/computer-chess-championship#event=ccc-16-blitz-finals&game=94";
2r2r1k/3qp1bp/2p3p1/1p2P3/pN1P4/4Q1PP/1P3P2/2RR2K1 w - - bm Qe4; id "https://www.chess.com/computer-chess-championship#event=ccc-16-blitz-finals&game=274";
4k3/1pr4p/p5pP/P1r2pP1/3R4/3R1P2/5PK1/8 w - - bm f4; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=54";
2r1b1k1/Rpq1npb1/4p1p1/1P1pPnNp/5Q1P/3B1N2/2PB1PP1/6K1 w - - bm g4; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=234";

Here is the updated EPD file: https://drive.google.com/file/d/1QRtm7E ... sp=sharing

[Dariusz]

Thanks again for the correction Vinvin. I have added 4 more wonderful positions with the sources (although I couldn't find all of the sources):

Code: Select all

4qrk1/3bpp1p/p2p2p1/n1pP4/r1P1P2P/3Qb1P1/P1RB1PBK/1R6 w - - bm Bxa5; id "https://tcec-chess.com/#div=sf&game=71&season=21";
1r1qr1k1/6bp/1n1p2p1/2pP1p2/1n2PP2/1QN5/1P1N2PP/R4RBK w - - bm e5; id "https://tcec-chess.com/#div=vsob21&game=528&season=21";
5rk1/pp3pb1/2n3pp/2p5/P2pRN1P/8/1qP1QPP1/3R2K1 w - - bm Re8; id "https://tcec-chess.com/#div=p&game=207&season=20";
1r2r1k1/pb3p1p/2p3p1/1pq2P2/2pRP1PP/P7/1P3QB1/3R2K1 w - - bm h5; id "https://tcec-chess.com/#div=sf&game=33&season=17";
r1b5/1pk2pr1/1Rp1p1q1/p1PpPp1p/P2P1Q1P/4P1P1/4B1K1/3R4 w - - bm e4; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=44";
r4rk1/pbq1bppp/1pn1p3/3pP3/NP3P2/P1PB4/5BPP/2RQ1RK1 w - - bm c4; id "https://tcec-chess.com/#div=sf&game=64&season=16";
3r1rk1/1bqn1pnp/p1pb4/1p2p1P1/P3P3/2NB1N2/1PPBQ2P/4RR1K w - - bm Nh4; id "https://tcec-chess.com/#div=vvltc&game=3&season=21";
8/3p4/p2kp1N1/p1r4p/P6P/5RK1/8/8 w - - bm Kf4; id "https://tcec-chess.com/#div=vsob21&game=96&season=21";
rn2kbnr/pp3pp1/4p3/3pP1Bp/2pP3P/2P5/Pq2NPP1/RN1Q1RK1 b kq - - bm Qxa1; id "https://tcec-chess.com/#div=vsob21&game=166&season=21";
r4rk1/pp2bppp/3pbn2/q3p1B1/4PP1P/2N1Q3/PPP3P1/2KR1B1R w - - bm f5; id "https://tcec-chess.com/#div=vsob21&game=331&season=21";
2rr4/pppn1p1k/1n1p2pb/3Pp2p/4P2P/2N2P2/PP4R1/3R1QK1 w - - bm Rc2; id "https://tcec-chess.com/#div=vsob21&game=361&season=21";
r3r3/ppp3kp/3p4/3P1Bp1/1PP1b3/4P3/P3K1PP/3R1R2 b - - bm Bxg2; id "https://tcec-chess.com/#game=11&round=fl&season=cup10";
r4rk1/ppp1bppp/2p5/4P3/8/1q2B3/PPPR1PPP/3R2K1 w - - bm cxb3; id "https://tcec-chess.com/#div=vsob21&game=418&season=21"; 
1r3n2/5k1p/p2p2p1/P4p2/2PP1P1P/6P1/2K1R3/4B3 w - - bm d5; id "https://tcec-chess.com/#div=sft&game=7&season=22";
r2k1n2/pp1n4/2p5/5q2/N5p1/6Q1/PP4B1/K3R3 w - - bm Rd1; id "https://tcec-chess.com/#div=sbf&game=22&season=22";
2rr2k1/p7/1p2p2p/4P1q1/6P1/3R3P/PP6/4QRK1 w - - bm Qe4; id "https://tcec-chess.com/#div=sbf&game=18&season=22";
4bq2/1r4pk/r3p2n/1n1pPpB1/2pP3Q/p1P2P1B/R1P1NK2/6R1 w - - bm Raa1; id "https://www.chess.com/computer-chess-championship#event=ccc-17-bullet-finals&game=18";
4r1k1/1b4b1/p3p1pp/2qpBn2/2p5/5N2/P4PPP/2RQR1K1 w - - bm Bxg7; id "https://www.chess.com/computer-chess-championship#event=ccc-17-bullet-finals&game=106";
1r2k3/1q1nbp1p/2rp1npP/1p2p1B1/pP2P3/P1NR1RP1/2PN1P2/3Q2K1 w - - bm Nd5; id "";
5r2/1p1kbp2/p1qp2p1/3Qp1P1/4P3/P4P1R/1PP5/1K3B2 w - - bm Qd2; id "https://tcec-chess.com/#div=sbf&game=72&season=22";
4q3/6r1/p2p2pk/1p1Pb2p/4Q3/P5R1/1PP5/1K4R1 w - - bm Rg5; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=186";
r2qr1k1/1b1n1pbp/pp2p1p1/7P/1B1PP3/R2BQN2/5PP1/1R4K1 w - - bm h6; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=202";
2n2rk1/1p1r1q2/p2p2p1/Q2Pp2p/5p1P/3B1Pn1/PPP2BP1/1K1RR3 w - - bm Bxg3; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=270";
4n1k1/1p1q4/pP1p1pp1/1r1P3p/2N1P3/1P3Q1P/5RP1/6K1 w - - bm e5; id "https://www.chess.com/computer-chess-championship#event=ccc-16-rapid-finals&game=80";
3r4/pp4kp/P1q3p1/2p1bpPP/2r1p3/R7/1PB3Q1/2B1R2K w - - bm Bb3; id "https://www.chess.com/computer-chess-championship#event=ccc-16-blitz-finals&game=272";
2r5/p1rq1k1p/Pnp1pbp1/1p3p2/3PPP2/1P1BBP2/2R4P/3R2QK w - - bm h4; id "";
8/p3r2k/Pp2q3/2pQ4/K1P2p2/1P6/7P/3R4 w - - bm Rd2; id "https://www.chess.com/computer-chess-championship#event=ccc-16-bullet-finals&game=320";
1r3k2/2r4p/2Pq2pP/3P1p2/2B1p3/p3Q1P1/Rb3PK1/3R4 w - - bm Rxb2; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=220";
1r1q1r2/pp3pbk/3p2pp/2pPp3/P1P1P1BP/Q1Nn4/1P1B1P2/2KR3R w - bm Kc2; id "";
5rk1/p2n1p2/2qPp1p1/2p4p/4N2P/8/r1P1QPP1/3RR1K1 w - - bm g4; id "https://www.chess.com/computer-chess-championship#event=ccc-16-bullet-finals&game=996";
1r4k1/q3pp1p/3p1np1/1PpP4/n3PP2/P3N3/R1QB2PP/6K1 w - - bm e5; id "https://www.chess.com/computer-chess-championship#event=ccc-16-bullet-finals&game=1046";
4k2r/1q1n1p2/r2b2p1/1ppPp3/p3P1Np/1P4P1/PB2QP1P/2R2R1K w k - - bm Kg2; id "https://www.chess.com/computer-chess-championship#event=ccc-16-bullet-finals&game=1350";
r1b1k2r/2p2pbp/3p2p1/2pPp3/p3P2Q/nP3PN1/P4K1P/3R3R w kq - - bm Nh5; id "https://www.chess.com/computer-chess-championship#event=merry-queen-sac&game=133";
1r1q1rk1/6n1/2p1p2p/2PpN2b/Q2P1pp1/P5P1/1P3P1B/1R2R1K1 b - - bm f3; id "https://www.chess.com/computer-chess-championship#event=the-hillbilly-attack&game=312";
r1b2rkb/1p1nq2p/2p1pn1P/p2p1p2/3P1Bp1/2PN1PP1/PP2P1B1/RN1QK2R w KQ - - bm Qd2; id "";
7k/4nr1p/5p2/4pP2/b2p2P1/8/2PB2BP/1R4K1 w - - bm Bh6; id "https://www.chess.com/computer-chess-championship#event=ccc-rapid-2021-finals&game=180";
2r2rk1/2P3p1/1p2b1pp/p1n1B3/1p5P/6P1/P4PB1/R2R2K1 w - - bm Rac1; id "https://www.chess.com/computer-chess-championship#event=ccc-blitz-championship-2020-finals&game=96";
1rnq2k1/pp3rb1/P2p2p1/3Pp1Pp/1QP1PnbP/2N1B1R1/3N4/1R2KB2 w - - bm axb7; id "https://tcec-chess.com/#div=sf&game=3&season=18";
2rqr1k1/pp1bbp1p/2n1p1pB/2N1P3/1PQp4/P4N2/5PP1/3RR1K1 w - - bm Ne4; id "https://tcec-chess.com/#div=sf&game=65&season=18";
2r4k/3R1p2/2P3Rp/1p5P/1P3rp1/P7/3K4/8 w - - bm Rxh6; id "https://tcec-chess.com/#div=p&game=125&season=20";
7k/4q1pp/3bP3/3p3P/Bp1P1r2/p2R4/2P3P1/K3Q3 b - - bm Qf6; id "https://tcec-chess.com/#div=sf&game=13&season=22";
r3k1nr/p2q2bp/Rp2ppp1/3pP1N1/3P1Q2/1PP3N1/5PPP/2R3K1 w kq - - bm N5e4; id "https://tcec-chess.com/#div=sf&game=92&season=19";
4r2k/3b3p/p2p1Rp1/3Bn3/1p6/1PB5/P1P5/2K5 w - - bm Bd4; id "https://www.chess.com/computer-chess-championship#event=ccc-16-blitz-finals&game=94";
2r2r1k/3qp1bp/2p3p1/1p2P3/pN1P4/4Q1PP/1P3P2/2RR2K1 w - - bm Qe4; id "https://www.chess.com/computer-chess-championship#event=ccc-16-blitz-finals&game=274";
4k3/1pr4p/p5pP/P1r2pP1/3R4/3R1P2/5PK1/8 w - - bm f4; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=54";
2r1b1k1/Rpq1npb1/4p1p1/1P1pPnNp/5Q1P/3B1N2/2PB1PP1/6K1 w - - bm g4; id "https://www.chess.com/computer-chess-championship#event=ccc-17-rapid-finals&game=234";

Here is the updated EPD file: https://drive.google.com/file/d/1QRtm7E ... sp=sharing

Thx