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I spent a good deal of time reviewing the WAC (Win at Chess) positions to remove positions with wrong solutions, multiple solutions, or ones that can be 'solved' but for the wrong reasons. I.e. playing a move for a perpetual instead of seeing the win. I also removed WAC 230, a notorious position as it is not even clear it wins, plus it doesn't really fit the bill here since all positions are quite easy except for that one, even if correct. All positions were checked in multi-PV mode with Komodo 11. In the end, of the 300, original positions, 201 were left. However, I am fairly confident that any position that is solved was truly solved, with little room for ambiguity.

Here they are:

Thanks, very useful!

Alex Szabo showed that WAC 230 is a draw if played perfectly by both sides.
The rook sacrifice is the only move with winning chances.
I still love that position and I am waiting for the engine that can faithfully show Mr. Szabo's refutation in the pv.

Analyzed WAC positions attached.

Today, WAC has limited usefulness.

Albert Silver wrote: ↑Wed May 16, 2018 11:41 pm I spent a good deal of time reviewing the WAC (Win at Chess) positions to remove positions with wrong solutions, multiple solutions, or ones that can be 'solved' but for the wrong reasons...

Thanks Albert !
May be we can call it "WAC2018".
But may be let's wait a bit for some revision ...

Albert Silver wrote: ↑Wed May 16, 2018 11:41 pm I spent a good deal of time reviewing the WAC (Win at Chess) positions to remove positions with wrong solutions, multiple solutions, or ones that can be 'solved' but for the wrong reasons. I.e. playing a move for a perpetual instead of seeing the win. I also removed WAC 230, a notorious position as it is not even clear it wins, plus it doesn't really fit the bill here since all positions are quite easy except for that one, even if correct. All positions were checked in multi-PV mode with Komodo 11. In the end, of the 300, original positions, 201 were left. However, I am fairly confident that any position that is solved was truly solved, with little room for ambiguity.

Here they are:

Code: Select all

5rk1/1ppb3p/p1pb4/6q1/3P1p1r/2P1R2P/PP1BQ1P1/5RKN w - - bm Rg3; id "WAC.003";
r1bq2rk/pp3pbp/2p1p1pQ/7P/3P4/2PB1N2/PP3PPR/2KR4 w - - bm Qxh7+; id "WAC.004";
5k2/6pp/p1qN4/1p1p4/3P4/2PKP2Q/PP3r2/3R4 b - - bm Qc4+; id "WAC.005";
7k/p7/1R5K/6r1/6p1/6P1/8/8 w - - bm Rb7; id "WAC.006";
rnbqkb1r/pppp1ppp/8/4P3/6n1/7P/PPPNPPP1/R1BQKBNR b KQkq - bm Ne3; id "WAC.007";
r4q1k/p2bR1rp/2p2Q1N/5p2/5p2/2P5/PP3PPP/R5K1 w - - bm Rf7; id "WAC.008";
2br2k1/2q3rn/p2NppQ1/2p1P3/Pp5R/4P3/1P3PPP/3R2K1 w - - bm Rxh7; id "WAC.010";
r1b1kb1r/3q1ppp/pBp1pn2/8/Np3P2/5B2/PPP3PP/R2Q1RK1 w kq - bm Bxc6; id "WAC.011";
4k1r1/2p3r1/1pR1p3/3pP2p/3P2qP/P4N2/1PQ4P/5R1K b - - bm Qxf3+; id "WAC.012";
5rk1/pp4p1/2n1p2p/2Npq3/2p5/6P1/P3P1BP/R4Q1K w - - bm Qxf8+; id "WAC.013";
r2rb1k1/pp1q1p1p/2n1p1p1/2bp4/5P2/PP1BPR1Q/1BPN2PP/R5K1 w - - bm Qxh7+; id "WAC.014";
r4rk1/ppp2ppp/2n5/2bqp3/8/P2PB3/1PP1NPPP/R2Q1RK1 w - - bm Nc3; id "WAC.016";
1k5r/pppbn1pp/4q1r1/1P3p2/2NPp3/1QP5/P4PPP/R1B1R1K1 w - - bm Ne5; id "WAC.017";
R7/P4k2/8/8/8/8/r7/6K1 w - - bm Rh8; id "WAC.018";
r1b2rk1/ppbn1ppp/4p3/1QP4q/3P4/N4N2/5PPP/R1B2RK1 w - - bm c6; id "WAC.019";
r2qkb1r/1ppb1ppp/p7/4p3/P1Q1P3/2P5/5PPP/R1B2KNR b kq - bm Bb5; id "WAC.020";
5rk1/1b3p1p/pp3p2/3n1N2/1P6/P1qB1PP1/3Q3P/4R1K1 w - - bm Qh6; id "WAC.021";
r1bqk2r/ppp1nppp/4p3/n5N1/2BPp3/P1P5/2P2PPP/R1BQK2R w KQkq - bm Nxf7; id "WAC.022";
r3nrk1/2p2p1p/p1p1b1p1/2NpPq2/3R4/P1N1Q3/1PP2PPP/4R1K1 w - - bm g4; id "WAC.023";
6k1/1b1nqpbp/pp4p1/5P2/1PN5/4Q3/P5PP/1B2B1K1 b - - bm Bd4; id "WAC.024";
3R1rk1/8/5Qpp/2p5/2P1p1q1/P3P3/1P2PK2/8 b - - bm Qh4+; id "WAC.025";
3r2k1/1p1b1pp1/pq5p/8/3NR3/2PQ3P/PP3PP1/6K1 b - - bm Bf5; id "WAC.026";
7k/pp4np/2p3p1/3pN1q1/3P4/Q7/1r3rPP/2R2RK1 w - - bm Qf8+; id "WAC.027";
1r1r2k1/4pp1p/2p1b1p1/p3R3/RqBP4/4P3/1PQ2PPP/6K1 b - - bm Qe1+; id "WAC.028";
r2q2k1/pp1rbppp/4pn2/2P5/1P3B2/6P1/P3QPBP/1R3RK1 w - - bm c6; id "WAC.029";
1r3r2/4q1kp/b1pp2p1/5p2/pPn1N3/6P1/P3PPBP/2QRR1K1 w - - bm Nxd6; id "WAC.030";
6k1/p4p1p/1p3np1/2q5/4p3/4P1N1/PP3PPP/3Q2K1 w - - bm Qd8+; id "WAC.032";
7k/1b1r2p1/p6p/1p2qN2/3bP3/3Q4/P5PP/1B1R3K b - - bm Bg1; id "WAC.034";
r3r2k/2R3pp/pp1q1p2/8/3P3R/7P/PP3PP1/3Q2K1 w - - bm Rxh7+; id "WAC.035";
3r4/2p1rk2/1pQq1pp1/7p/1P1P4/P4P2/6PP/R1R3K1 b - - bm Re1+; id "WAC.036";
2r5/2rk2pp/1pn1pb2/pN1p4/P2P4/1N2B3/nPR1KPPP/3R4 b - - bm Nxd4+; id "WAC.037";
r1br2k1/pp2bppp/2nppn2/8/2P1PB2/2N2P2/PqN1B1PP/R2Q1R1K w - - bm Na4; id "WAC.039";
3r1r1k/1p4pp/p4p2/8/1PQR4/6Pq/P3PP2/2R3K1 b - - bm Rc8; id "WAC.040";
r1b1r1k1/pp1n1pbp/1qp3p1/3p4/1B1P4/Q3PN2/PP2BPPP/R4RK1 w - - bm Ba5; id "WAC.042";
3rb1k1/pq3pbp/4n1p1/3p4/2N5/2P2QB1/PP3PPP/1B1R2K1 b - - bm dxc4; id "WAC.044";
7k/2p1b1pp/8/1p2P3/1P3r2/2P3Q1/1P5P/R4qBK b - - bm Qxa1; id "WAC.045";
r1bqr1k1/pp1nb1p1/4p2p/3p1p2/3P4/P1N1PNP1/1PQ2PP1/3RKB1R w K - bm Nb5; id "WAC.046";
r1b2rk1/pp2bppp/2n1pn2/q5B1/2BP4/2N2N2/PP2QPPP/2R2RK1 b - - bm Nxd4; id "WAC.047";
1rbq1rk1/p1p1bppp/2p2n2/8/Q1BP4/2N5/PP3PPP/R1B2RK1 b - - bm Rb4; id "WAC.048";
k4r2/1R4pb/1pQp1n1p/3P4/5p1P/3P2P1/r1q1R2K/8 w - - bm Rxb6+; id "WAC.050";
r1bq1r2/pp4k1/4p2p/3pPp1Q/3N1R1P/2PB4/6P1/6K1 w - - bm Rg4+; id "WAC.051";
6k1/6p1/p7/3Pn3/5p2/4rBqP/P4RP1/5QK1 b - - bm Re1; id "WAC.053";
r3kr2/1pp4p/1p1p4/7q/4P1n1/2PP2Q1/PP4P1/R1BB2K1 b q - bm Qh1+; id "WAC.054";
r3r1k1/pp1q1pp1/4b1p1/3p2B1/3Q1R2/8/PPP3PP/4R1K1 w - - bm Qxg7+; id "WAC.055";
r1bqk2r/pppp1ppp/5n2/2b1n3/4P3/1BP3Q1/PP3PPP/RNB1K1NR b KQkq - bm Bxf2+; id "WAC.056";
r3q1kr/ppp5/3p2pQ/8/3PP1b1/5R2/PPP3P1/5RK1 w - - bm Rf8+; id "WAC.057";
8/8/2R5/1p2qp1k/1P2r3/2PQ2P1/5K2/8 w - - bm Qd1+; id "WAC.058";
r1b2rk1/2p1qnbp/p1pp2p1/5p2/2PQP3/1PN2N1P/PB3PP1/3R1RK1 w - - bm Nd5; id "WAC.059";
6r1/3Pn1qk/p1p1P1rp/2Q2p2/2P5/1P4P1/P3R2P/5RK1 b - - bm Rxg3+; id "WAC.062";
r1brnbk1/ppq2pp1/4p2p/4N3/3P4/P1PB1Q2/3B1PPP/R3R1K1 w - - bm Nxf7; id "WAC.063";
8/6pp/3q1p2/3n1k2/1P6/3NQ2P/5PP1/6K1 w - - bm g4+; id "WAC.064";
1r1r1qk1/p2n1p1p/bp1Pn1pQ/2pNp3/2P2P1N/1P5B/P6P/3R1RK1 w - - bm Ne7+; id "WAC.065";
1k1r2r1/ppq5/1bp4p/3pQ3/8/2P2N2/PP4P1/R4R1K b - - bm Qxe5; id "WAC.066";
3r2k1/p2q4/1p4p1/3rRp1p/5P1P/6PK/P3R3/3Q4 w - - bm Rxd5; id "WAC.067";
6k1/5ppp/1q6/2b5/8/2R1pPP1/1P2Q2P/7K w - - bm Qxe3; id "WAC.068";
2kr3r/pppq1ppp/3p1n2/bQ2p3/1n1PP3/1PN1BN1P/1PP2PP1/2KR3R b - - bm Na2+; id "WAC.070";
2kr3r/pp1q1ppp/5n2/1Nb5/2Pp1B2/7Q/P4PPP/1R3RK1 w - - bm Nxa7+; id "WAC.071";
r3r1k1/pp1n1ppp/2p5/4Pb2/2B2P2/B1P5/P5PP/R2R2K1 w - - bm e6; id "WAC.072";
r1q3rk/1ppbb1p1/4Np1p/p3pP2/P3P3/2N4R/1PP1Q1PP/3R2K1 w - - bm Qd2; id "WAC.073";
r3r1k1/pppq1ppp/8/8/1Q4n1/7P/PPP2PP1/RNB1R1K1 b - - bm Qd6; id "WAC.075";
r1b1qrk1/2p2ppp/pb1pnn2/1p2pNB1/3PP3/1BP5/PP2QPPP/RN1R2K1 w - - bm Bxf6; id "WAC.076";
3r2k1/ppp2ppp/6q1/b4n2/3nQB2/2p5/P4PPP/RN3RK1 b - - bm Ng3; id "WAC.077";
r2q3r/ppp2k2/4nbp1/5Q1p/2P1NB2/8/PP3P1P/3RR1K1 w - - bm Ng5+; id "WAC.078";
r4rk1/p1B1bpp1/1p2pn1p/8/2PP4/3B1P2/qP2QP1P/3R1RK1 w - - bm Ra1; id "WAC.080";
r4rk1/1bR1bppp/4pn2/1p2N3/1P6/P3P3/4BPPP/3R2K1 b - - bm Bd6; id "WAC.081";
3rr1k1/pp3pp1/4b3/8/2P1B2R/6QP/P3q1P1/5R1K w - - bm Bh7+; id "WAC.082";
r2q1r1k/2p1b1pp/p1n5/1p1Q1bN1/4n3/1BP1B3/PP3PPP/R4RK1 w - - bm Qg8+; id "WAC.084";
8/p7/1ppk1n2/5ppp/P1PP4/2P1K1P1/5N1P/8 b - - bm Ng4+; id "WAC.086";
8/p3k1p1/4r3/2ppNpp1/PP1P4/2P3KP/5P2/8 b - - bm Rxe5; id "WAC.087";
r6k/p1Q4p/2p1b1rq/4p3/B3P3/4P3/PPP3P1/4RRK1 b - - bm Rxg2+; id "WAC.088";
3qrrk1/1pp2pp1/1p2bn1p/5N2/2P5/P1P3B1/1P4PP/2Q1RRK1 w - - bm Nxg7; id "WAC.090";
2qr2k1/4b1p1/2p2p1p/1pP1p3/p2nP3/PbQNB1PP/1P3PK1/4RB2 b - - bm Be6; id "WAC.091";
r4rk1/1p2ppbp/p2pbnp1/q7/3BPPP1/2N2B2/PPP4P/R2Q1RK1 b - - bm Bxg4; id "WAC.092";
r1b1k1nr/pp3pQp/4pq2/3pn3/8/P1P5/2P2PPP/R1B1KBNR w KQkq - bm Bh6; id "WAC.093";
8/k7/p7/3Qp2P/n1P5/3KP3/1q6/8 b - - bm e4+; id "WAC.094";
2r5/1r6/4pNpk/3pP1qp/8/2P1QP2/5PK1/R7 w - - bm Ng4+; id "WAC.095";
6k1/5p2/p5np/4B3/3P4/1PP1q3/P3r1QP/6RK w - - bm Qa8+; id "WAC.097";
1r3rk1/5pb1/p2p2p1/Q1n1q2p/1NP1P3/3p1P1B/PP1R3P/1K2R3 b - - bm Nxe4; id "WAC.098";
r1bq1r1k/1pp1Np1p/p2p2pQ/4R3/n7/8/PPPP1PPP/R1B3K1 w - - bm Rh5; id "WAC.099";
8/k1b5/P4p2/1Pp2p1p/K1P2P1P/8/3B4/8 w - - bm Be3 b6+; id "WAC.100";
5rk1/p5pp/8/8/2Pbp3/1P4P1/7P/4RN1K b - - bm Bc3; id "WAC.101";
6k1/2pb1r1p/3p1PpQ/p1nPp3/1q2P3/2N2P2/PrB5/2K3RR w - - bm Qxg6+; id "WAC.103";
5n2/pRrk2p1/P4p1p/4p3/3N4/5P2/6PP/6K1 w - - bm Nb5; id "WAC.107";
r5k1/1q4pp/2p5/p1Q5/2P5/5R2/4RKPP/r7 w - - bm Qe5; id "WAC.108";
rn2k1nr/pbp2ppp/3q4/1p2N3/2p5/QP6/PB1PPPPP/R3KB1R b KQkq - bm c3; id "WAC.109";
2kr4/bp3p2/p2p2b1/P7/2q5/1N4B1/1PPQ2P1/2KR4 b - - bm Be3; id "WAC.110";
6k1/p5p1/5p2/2P2Q2/3pN2p/3PbK1P/7P/6q1 b - - bm Qf1+; id "WAC.111";
r4kr1/ppp5/4bq1b/7B/2PR1Q1p/2N3P1/PP3P1P/2K1R3 w - - bm Rxe6; id "WAC.112";
rnbqkb1r/1p3ppp/5N2/1p2p1B1/2P5/8/PP2PPPP/R2QKB1R b KQkq - bm Qxf6; id "WAC.113";
r1b1rnk1/1p4pp/p1p2p2/3pN2n/3P1PPq/2NBPR1P/PPQ5/2R3K1 w - - bm Bxh7+; id "WAC.114";
4N2k/5rpp/1Q6/p3q3/8/P5P1/1P3P1P/5K2 w - - bm Nd6; id "WAC.115";
r2r2k1/2p2ppp/p7/1p2P1n1/P6q/5P2/1PB1QP1P/R5RK b - - bm Rd2; id "WAC.116";
3r1rk1/q4ppp/p1Rnp3/8/1p6/1N3P2/PP3QPP/3R2K1 b - - bm Ne4; id "WAC.117";
r5k1/pb2rpp1/1p6/2p4q/5R2/2PB2Q1/P1P3PP/5R1K w - - bm Rh4; id "WAC.118";
r2qr1k1/p1p2ppp/2p5/2b5/4nPQ1/3B4/PPP3PP/R1B2R1K b - - bm Qxd3; id "WAC.119";
6k1/5p1p/2bP2pb/4p3/2P5/1p1pNPPP/1P1Q1BK1/1q6 b - - bm Bxf3+; id "WAC.121";
1k6/ppp4p/1n2pq2/1N2Rb2/2P2Q2/8/P4KPP/3r1B2 b - - bm Rxf1+; id "WAC.122";
6k1/3r4/2R5/P5P1/1P4p1/8/4rB2/6K1 b - - bm g3; id "WAC.124";
r1bqr1k1/pp3ppp/1bp5/3n4/3B4/2N2P1P/PPP1B1P1/R2Q1RK1 b - - bm Bxd4+; id "WAC.125";
r5r1/pQ5p/1qp2R2/2k1p3/4P3/2PP4/P1P3PP/6K1 w - - bm Rxc6+; id "WAC.126";
2k4r/1pr1n3/p1p1q2p/5pp1/3P1P2/P1P1P3/1R2Q1PP/1RB3K1 w - - bm Rxb7; id "WAC.127";
6rk/1pp2Qrp/3p1B2/1pb1p2R/3n1q2/3P4/PPP3PP/R6K w - - bm Qg6; id "WAC.128";
3r1r1k/1b2b1p1/1p5p/2p1Pp2/q1B2P2/4P2P/1BR1Q2K/6R1 b - - bm Bf3; id "WAC.129";
6k1/1pp3q1/5r2/1PPp4/3P1pP1/3Qn2P/3B4/4R1K1 b - - bm Qh6; id "WAC.130";
r1b1k2r/1pp1q2p/p1n3p1/3QPp2/8/1BP3B1/P5PP/3R1RK1 w kq - bm Bh4; id "WAC.133";
3r2k1/p6p/2Q3p1/4q3/2P1p3/P3Pb2/1P3P1P/2K2BR1 b - - bm Rd1+; id "WAC.134";
3r1r1k/N2qn1pp/1p2np2/2p5/2Q1P2N/3P4/PP4PP/3R1RK1 b - - bm Nd4; id "WAC.135";
3b1rk1/1bq3pp/5pn1/1p2rN2/2p1p3/2P1B2Q/1PB2PPP/R2R2K1 w - - bm Rd7; id "WAC.137";
r1bq3r/ppppR1p1/5n1k/3P4/6pP/3Q4/PP1N1PP1/5K1R w - - bm h5; id "WAC.138";
rnb3kr/ppp2ppp/1b6/3q4/3pN3/Q4N2/PPP2KPP/R1B1R3 w - - bm Nf6+; id "WAC.139";
r2b1rk1/pq4p1/4ppQP/3pB1p1/3P4/2R5/PP3PP1/5RK1 w - - bm Bc7 Rc7; id "WAC.140";
4r1k1/p1qr1p2/2pb1Bp1/1p5p/3P1n1R/1B3P2/PP3PK1/2Q4R w - - bm Qxf4; id "WAC.141";
5b2/pp2r1pk/2pp1pRp/4rP1N/2P1P3/1P4QP/P3q1P1/5R1K w - - bm Rxh6+; id "WAC.143";
r2q1rk1/pp3ppp/2p2b2/8/B2pPPb1/7P/PPP1N1P1/R2Q1RK1 b - - bm d3; id "WAC.144";
r2r2k1/ppqbppbp/2n2np1/2pp4/6P1/1P1PPNNP/PBP2PB1/R2QK2R b KQ - bm Nxg4; id "WAC.147";
2r1k3/6pr/p1nBP3/1p3p1p/2q5/2P5/P1R4P/K2Q2R1 w - - bm Rxg7; id "WAC.148";
6k1/6p1/2p4p/4Pp2/4b1qP/2Br4/1P2RQPK/8 b - - bm Bxg2; id "WAC.149";
8/3b2kp/4p1p1/pr1n4/N1N4P/1P4P1/1K3P2/3R4 w - - bm Nc3; id "WAC.151";
1br2rk1/1pqb1ppp/p3pn2/8/1P6/P1N1PN1P/1B3PP1/1QRR2K1 w - - bm Ne4; id "WAC.152";
r1b2rk1/2p2ppp/p7/1p6/3P3q/1BP3bP/PP3QP1/RNB1R1K1 w - - bm Qxf7+; id "WAC.154";
5bk1/1rQ4p/5pp1/2pP4/3n1PP1/7P/1q3BB1/4R1K1 w - - bm d6; id "WAC.155";
r1b1qN1k/1pp3p1/p2p3n/4p1B1/8/1BP4Q/PP3KPP/8 w - - bm Qxh6+; id "WAC.156";
5rk1/p4ppp/2p1b3/3Nq3/4P1n1/1p1B2QP/1PPr2P1/1K2R2R w - - bm Ne7+; id "WAC.157";
r1b2r2/5P1p/ppn3pk/2p1p1Nq/1bP1PQ2/3P4/PB4BP/1R3RK1 w - - bm Ne6+; id "WAC.159";
r3kbnr/p4ppp/2p1p3/8/Q1B3b1/2N1B3/PP3PqP/R3K2R w KQkq - bm Bd5; id "WAC.162";
5rk1/2p4p/2p4r/3P4/4p1b1/1Q2NqPp/PP3P1K/R4R2 b - - bm Qg2+; id "WAC.163";
8/6pp/4p3/1p1n4/1NbkN1P1/P4P1P/1PR3K1/r7 w - - bm Rxc4+; id "WAC.164";
1r5k/p1p3pp/8/8/4p3/P1P1R3/1P1Q1qr1/2KR4 w - - bm Re2; id "WAC.165";
r3r1k1/5pp1/p1p4p/2Pp4/8/q1NQP1BP/5PP1/4K2R b K - bm d4; id "WAC.166";
r3k2r/pb1q1p2/8/2p1pP2/4p1p1/B1P1Q1P1/P1P3K1/R4R2 b kq - bm Qd2+; id "WAC.168";
5rk1/1pp3bp/3p2p1/2PPp3/1P2P3/2Q1B3/4q1PP/R5K1 b - - bm Bh6; id "WAC.169";
5r1k/6Rp/1p2p3/p2pBp2/1qnP4/4P3/Q4PPP/6K1 w - - bm Qxc4; id "WAC.170";
2rq4/1b2b1kp/p3p1p1/1p1nNp2/7P/1B2B1Q1/PP3PP1/3R2K1 w - - bm Bh6+; id "WAC.171";
2r1b3/1pp1qrk1/p1n1P1p1/7R/2B1p3/4Q1P1/PP3PP1/3R2K1 w - - bm Qh6+; id "WAC.173";
r5k1/pppb3p/2np1n2/8/3PqNpP/3Q2P1/PPP5/R4RK1 w - - bm Nh5; id "WAC.175";
3r2k1/p1rn1p1p/1p2pp2/6q1/3PQNP1/5P2/P1P4R/R5K1 w - - bm Nxe6; id "WAC.178";
r1q2rk1/p3bppb/3p1n1p/2nPp3/1p2P1P1/6NP/PP2QPB1/R1BNK2R b KQ - bm Nxd5; id "WAC.180";
r3k2r/2p2p2/p2p1n2/1p2p3/4P2p/1PPPPp1q/1P5P/R1N2QRK b kq - bm Ng4; id "WAC.181";
r1b2rk1/ppqn1p1p/2n1p1p1/2b3N1/2N5/PP1BP3/1B3PPP/R2QK2R w KQ - bm Qh5; id "WAC.182";
6k1/5p2/p3p3/1p3qp1/2p1Qn2/2P1R3/PP1r1PPP/4R1K1 b - - bm Nh3+; id "WAC.187";
3RNbk1/pp3p2/4rQpp/8/1qr5/7P/P4P2/3R2K1 w - - bm Qg7+; id "WAC.188";
8/p2b2kp/1q1p2p1/1P1Pp3/4P3/3B2P1/P2Q3P/2Nn3K b - - bm Bh3; id "WAC.190";
r3k3/ppp2Npp/4Bn2/2b5/1n1pp3/N4P2/PPP3qP/R2QKR2 b Qq - bm Nd3+; id "WAC.192";
5rk1/ppq2ppp/2p5/4bN2/4P3/6Q1/PPP2PPP/3R2K1 w - - bm Nh6+; id "WAC.194";
3r1rk1/1p3p2/p3pnnp/2p3p1/2P2q2/1P5P/PB2QPPN/3RR1K1 w - - bm g3; id "WAC.195";
rr4k1/p1pq2pp/Q1n1pn2/2bpp3/4P3/2PP1NN1/PP3PPP/R1B1K2R b KQ - bm Nb4; id "WAC.196";
7k/1p4p1/7p/3P1n2/4Q3/2P2P2/PP3qRP/7K b - - bm Qf1+; id "WAC.197";
2br2k1/ppp2p1p/4p1p1/4P2q/2P1Bn2/2Q5/PP3P1P/4R1RK b - - bm Rd3; id "WAC.198";
2rqrn1k/pb4pp/1p2pp2/n2P4/2P3N1/P2B2Q1/1B3PPP/2R1R1K1 w - - bm Bxf6; id "WAC.200";
2b2r1k/4q2p/3p2pQ/2pBp3/8/6P1/1PP2P1P/R5K1 w - - bm Ra7; id "WAC.201";
QR2rq1k/2p3p1/3p1pPp/8/4P3/8/P1r3PP/1R4K1 b - - bm Rxa2; id "WAC.202";
r4rk1/5ppp/p3q1n1/2p2NQ1/4n3/P3P3/1B3PPP/1R3RK1 w - - bm Qh6; id "WAC.203";
r1b1qrk1/1p3ppp/p1p5/3Nb3/5N2/P7/1P4PQ/K1R1R3 w - - bm Rxe5; id "WAC.204";
r3rnk1/1pq2bb1/p4p2/3p1Pp1/3B2P1/1NP4R/P1PQB3/2K4R w - - bm Qxg5; id "WAC.205";
1Qq5/2P1p1kp/3r1pp1/8/8/7P/p4PP1/2R3K1 b - - bm Rc6; id "WAC.206";
r1bq2kr/p1pp1ppp/1pn1p3/4P3/2Pb2Q1/BR6/P4PPP/3K1BNR w - - bm Qxg7+; id "WAC.207";
3r1bk1/ppq3pp/2p5/2P2Q1B/8/1P4P1/P6P/5RK1 w - - bm Bf7+; id "WAC.208";
3r1rk1/pp1q1ppp/3pn3/2pN4/5PP1/P5PQ/1PP1B3/1K1R4 w - - bm Rh1; id "WAC.210";
rn1qr2Q/pbppk1p1/1p2pb2/4N3/3P4/2N5/PPP3PP/R4RK1 w - - bm Qxg7+; id "WAC.212";
3r1r1k/1b4pp/ppn1p3/4Pp1R/Pn5P/3P4/4QP2/1qB1NKR1 w - - bm Rxh7+; id "WAC.213";
3r2k1/pb1q1pp1/1p2pb1p/8/3N4/P2QB3/1P3PPP/1Br1R1K1 w - - bm Qh7+; id "WAC.215";
7k/p4q1p/1pb5/2p5/4B2Q/2P1B3/P6P/7K b - - bm Qf1+; id "WAC.219";
3rr1k1/ppp2ppp/8/5Q2/4n3/1B5R/PPP1qPP1/5RK1 b - - bm Qxf1+; id "WAC.220";
2r1r2k/1q3ppp/p2Rp3/2p1P3/6QB/p3P3/bP3PPP/3R2K1 w - - bm Bf6; id "WAC.222";
2k1rb1r/ppp3pp/2np1q2/5b2/2B2P2/2P1BQ2/PP1N1P1P/2KR3R b - - bm d5; id "WAC.227";
r4rk1/1bq1bp1p/4p1p1/p2p4/3BnP2/1N1B3R/PPP3PP/R2Q2K1 w - - bm Bxe4; id "WAC.228";
r4rk1/1b1nqp1p/p5p1/1p2PQ2/2p5/5N2/PP3PPP/R1BR2K1 w - - bm Bg5; id "WAC.231";
1R6/p5pk/4p2p/4P3/8/2r3qP/P3R1b1/4Q1K1 b - - bm Rc1; id "WAC.236";
r5k1/pQp2qpp/8/4pbN1/3P4/6P1/PPr4P/1K1R3R b - - bm Rc1+; id "WAC.237";
1k1r4/pp1r1pp1/4n1p1/2R5/2Pp1qP1/3P2QP/P4PB1/1R4K1 w - - bm Bxb7; id "WAC.238";
2b4k/p1b2p2/2p2q2/3p1PNp/3P2R1/3B4/P1Q2PKP/4r3 w - - bm Qxc6; id "WAC.240";
r1b1r1k1/pp1nqp2/2p1p1pp/8/4N3/P1Q1P3/1P3PPP/1BRR2K1 w - - bm Rxd7; id "WAC.242";
1b5k/7P/p1p2np1/2P2p2/PP3P2/4RQ1R/q2r3P/6K1 w - - bm Re8+; id "WAC.250";
k5r1/p4b2/2P5/5p2/3P1P2/4QBrq/P5P1/4R1K1 w - - bm Qe8+; id "WAC.253";
r6k/pp3p1p/2p1bp1q/b3p3/4Pnr1/2PP2NP/PP1Q1PPN/R2B2RK b - - bm Nxh3; id "WAC.254";
3r3r/p4pk1/5Rp1/3q4/1p1P2RQ/5N2/P1P4P/2b4K w - - bm Rfxg6+; id "WAC.255";
3r1rk1/1pb1qp1p/2p3p1/p7/P2Np2R/1P5P/1BP2PP1/3Q1BK1 w - - bm Nf5; id "WAC.256";
4r1k1/pq3p1p/2p1r1p1/2Q1p3/3nN1P1/1P6/P1P2P1P/3RR1K1 w - - bm Rxd4; id "WAC.257";
r3brkn/1p5p/2p2Ppq/2Pp3B/3Pp2Q/4P1R1/6PP/5R1K w - - bm Bxg6; id "WAC.258";
2r2b1r/p1Nk2pp/3p1p2/N2Qn3/4P3/q6P/P4PP1/1R3K1R w - - bm Qe6+; id "WAC.260";
6k1/p1B1b2p/2b3r1/2p5/4p3/1PP1N1Pq/P2R1P2/3Q2K1 b - - bm Rh6; id "WAC.262";
rnbqr2k/pppp1Qpp/8/b2NN3/2B1n3/8/PPPP1PPP/R1B1K2R w KQ - bm Qg8+; id "WAC.263";
2r1k2r/2pn1pp1/1p3n1p/p3PP2/4q2B/P1P5/2Q1N1PP/R4RK1 w k - bm exf6; id "WAC.265";
r3q2r/2p1k1p1/p5p1/1p2Nb2/1P2nB2/P7/2PNQbPP/R2R3K b - - bm Rxh2+; id "WAC.266";
2r1kb1r/pp3ppp/2n1b3/1q1N2B1/1P2Q3/8/P4PPP/3RK1NR w Kk - bm Nc7+; id "WAC.267";
2kr2nr/pp1n1ppp/2p1p3/q7/1b1P1B2/P1N2Q1P/1PP1BPP1/R3K2R w KQ - bm axb4; id "WAC.269";
2r1r1k1/pp1q1ppp/3p1b2/3P4/3Q4/5N2/PP2RPPP/4R1K1 w - - bm Qg4; id "WAC.270";
2kr4/ppp3Pp/4RP1B/2r5/5P2/1P6/P2p4/3K4 w - - bm Rd6; id "WAC.271";
nrq4r/2k1p3/1p1pPnp1/pRpP1p2/P1P2P2/2P1BB2/1R2Q1P1/6K1 w - - bm Bxc5; id "WAC.272";
r2qkb1r/pppb2pp/2np1n2/5pN1/2BQP3/2N5/PPP2PPP/R1B1K2R w KQkq - bm Bf7+; id "WAC.278";
2R5/2R4p/5p1k/6n1/8/1P2QPPq/r7/6K1 w - - bm Rxh7+; id "WAC.281";
6k1/2p3p1/1p1p1nN1/1B1P4/4PK2/8/2r3b1/7R w - - bm Rh8+; id "WAC.282";
3q1rk1/4bp1p/1n2P2Q/3p1p2/6r1/Pp2R2N/1B4PP/7K w - - bm Ng5; id "WAC.283";
3r1k2/1p6/p4P2/2pP2Qb/8/1P1KB3/P6r/8 b - - bm Rxd5+; id "WAC.286";
r1b2rk1/p4ppp/1p1Qp3/4P2N/1P6/8/P3qPPP/3R1RK1 w - - bm Nf6+; id "WAC.288";
2r3k1/5p1p/p3q1p1/2n3P1/1p1QP2P/1P4N1/PK6/2R5 b - - bm Qe5; id "WAC.289";
4r3/1Q1qk2p/p4pp1/3Pb3/P7/6PP/5P2/4R1K1 w - - bm d6+; id "WAC.292";
1nbq1r1k/3rbp1p/p1p1pp1Q/1p6/P1pPN3/5NP1/1P2PPBP/R4RK1 w - - bm Nfg5; id "WAC.293";
4r3/p4r1p/R1p2pp1/1p1bk3/4pNPP/2P1K3/2P2P2/3R4 w - - bm Rxd5+; id "WAC.295";
3Q4/p3b1k1/2p2rPp/2q5/4B3/P2P4/7P/6RK w - - bm Qh8+; id "WAC.298";
b2b1r1k/3R1ppp/4qP2/4p1PQ/4P3/5B2/4N1K1/8 w - - bm g6; id "WAC.300";

Thank for sharing. People also forget WAC300 was designed for humans to sharpen their tactics, not computers. As an example, the point of WAC227 was to show that you can play d5 safely, and win the piece - but what gets lost ( meaning it is not displayed in the computer pv analysis) is that Bxd5 loses to Qxc3+, bc3, Ba3#. Still a great set for humans to hone there their tactical skills on and it's nice to have a cleaner position set.

MikeB wrote: ↑Thu May 17, 2018 3:02 am

Albert Silver wrote: ↑Wed May 16, 2018 11:41 pm I spent a good deal of time reviewing the WAC (Win at Chess) positions to remove positions with wrong solutions, multiple solutions, or ones that can be 'solved' but for the wrong reasons. I.e. playing a move for a perpetual instead of seeing the win. I also removed WAC 230, a notorious position as it is not even clear it wins, plus it doesn't really fit the bill here since all positions are quite easy except for that one, even if correct. All positions were checked in multi-PV mode with Komodo 11. In the end, of the 300, original positions, 201 were left. However, I am fairly confident that any position that is solved was truly solved, with little room for ambiguity.

Here they are:

Code: Select all

5rk1/1ppb3p/p1pb4/6q1/3P1p1r/2P1R2P/PP1BQ1P1/5RKN w - - bm Rg3; id "WAC.003";
r1bq2rk/pp3pbp/2p1p1pQ/7P/3P4/2PB1N2/PP3PPR/2KR4 w - - bm Qxh7+; id "WAC.004";
5k2/6pp/p1qN4/1p1p4/3P4/2PKP2Q/PP3r2/3R4 b - - bm Qc4+; id "WAC.005";
7k/p7/1R5K/6r1/6p1/6P1/8/8 w - - bm Rb7; id "WAC.006";
rnbqkb1r/pppp1ppp/8/4P3/6n1/7P/PPPNPPP1/R1BQKBNR b KQkq - bm Ne3; id "WAC.007";
r4q1k/p2bR1rp/2p2Q1N/5p2/5p2/2P5/PP3PPP/R5K1 w - - bm Rf7; id "WAC.008";
2br2k1/2q3rn/p2NppQ1/2p1P3/Pp5R/4P3/1P3PPP/3R2K1 w - - bm Rxh7; id "WAC.010";
r1b1kb1r/3q1ppp/pBp1pn2/8/Np3P2/5B2/PPP3PP/R2Q1RK1 w kq - bm Bxc6; id "WAC.011";
4k1r1/2p3r1/1pR1p3/3pP2p/3P2qP/P4N2/1PQ4P/5R1K b - - bm Qxf3+; id "WAC.012";
5rk1/pp4p1/2n1p2p/2Npq3/2p5/6P1/P3P1BP/R4Q1K w - - bm Qxf8+; id "WAC.013";
r2rb1k1/pp1q1p1p/2n1p1p1/2bp4/5P2/PP1BPR1Q/1BPN2PP/R5K1 w - - bm Qxh7+; id "WAC.014";
r4rk1/ppp2ppp/2n5/2bqp3/8/P2PB3/1PP1NPPP/R2Q1RK1 w - - bm Nc3; id "WAC.016";
1k5r/pppbn1pp/4q1r1/1P3p2/2NPp3/1QP5/P4PPP/R1B1R1K1 w - - bm Ne5; id "WAC.017";
R7/P4k2/8/8/8/8/r7/6K1 w - - bm Rh8; id "WAC.018";
r1b2rk1/ppbn1ppp/4p3/1QP4q/3P4/N4N2/5PPP/R1B2RK1 w - - bm c6; id "WAC.019";
r2qkb1r/1ppb1ppp/p7/4p3/P1Q1P3/2P5/5PPP/R1B2KNR b kq - bm Bb5; id "WAC.020";
5rk1/1b3p1p/pp3p2/3n1N2/1P6/P1qB1PP1/3Q3P/4R1K1 w - - bm Qh6; id "WAC.021";
r1bqk2r/ppp1nppp/4p3/n5N1/2BPp3/P1P5/2P2PPP/R1BQK2R w KQkq - bm Nxf7; id "WAC.022";
r3nrk1/2p2p1p/p1p1b1p1/2NpPq2/3R4/P1N1Q3/1PP2PPP/4R1K1 w - - bm g4; id "WAC.023";
6k1/1b1nqpbp/pp4p1/5P2/1PN5/4Q3/P5PP/1B2B1K1 b - - bm Bd4; id "WAC.024";
3R1rk1/8/5Qpp/2p5/2P1p1q1/P3P3/1P2PK2/8 b - - bm Qh4+; id "WAC.025";
3r2k1/1p1b1pp1/pq5p/8/3NR3/2PQ3P/PP3PP1/6K1 b - - bm Bf5; id "WAC.026";
7k/pp4np/2p3p1/3pN1q1/3P4/Q7/1r3rPP/2R2RK1 w - - bm Qf8+; id "WAC.027";
1r1r2k1/4pp1p/2p1b1p1/p3R3/RqBP4/4P3/1PQ2PPP/6K1 b - - bm Qe1+; id "WAC.028";
r2q2k1/pp1rbppp/4pn2/2P5/1P3B2/6P1/P3QPBP/1R3RK1 w - - bm c6; id "WAC.029";
1r3r2/4q1kp/b1pp2p1/5p2/pPn1N3/6P1/P3PPBP/2QRR1K1 w - - bm Nxd6; id "WAC.030";
6k1/p4p1p/1p3np1/2q5/4p3/4P1N1/PP3PPP/3Q2K1 w - - bm Qd8+; id "WAC.032";
7k/1b1r2p1/p6p/1p2qN2/3bP3/3Q4/P5PP/1B1R3K b - - bm Bg1; id "WAC.034";
r3r2k/2R3pp/pp1q1p2/8/3P3R/7P/PP3PP1/3Q2K1 w - - bm Rxh7+; id "WAC.035";
3r4/2p1rk2/1pQq1pp1/7p/1P1P4/P4P2/6PP/R1R3K1 b - - bm Re1+; id "WAC.036";
2r5/2rk2pp/1pn1pb2/pN1p4/P2P4/1N2B3/nPR1KPPP/3R4 b - - bm Nxd4+; id "WAC.037";
r1br2k1/pp2bppp/2nppn2/8/2P1PB2/2N2P2/PqN1B1PP/R2Q1R1K w - - bm Na4; id "WAC.039";
3r1r1k/1p4pp/p4p2/8/1PQR4/6Pq/P3PP2/2R3K1 b - - bm Rc8; id "WAC.040";
r1b1r1k1/pp1n1pbp/1qp3p1/3p4/1B1P4/Q3PN2/PP2BPPP/R4RK1 w - - bm Ba5; id "WAC.042";
3rb1k1/pq3pbp/4n1p1/3p4/2N5/2P2QB1/PP3PPP/1B1R2K1 b - - bm dxc4; id "WAC.044";
7k/2p1b1pp/8/1p2P3/1P3r2/2P3Q1/1P5P/R4qBK b - - bm Qxa1; id "WAC.045";
r1bqr1k1/pp1nb1p1/4p2p/3p1p2/3P4/P1N1PNP1/1PQ2PP1/3RKB1R w K - bm Nb5; id "WAC.046";
r1b2rk1/pp2bppp/2n1pn2/q5B1/2BP4/2N2N2/PP2QPPP/2R2RK1 b - - bm Nxd4; id "WAC.047";
1rbq1rk1/p1p1bppp/2p2n2/8/Q1BP4/2N5/PP3PPP/R1B2RK1 b - - bm Rb4; id "WAC.048";
k4r2/1R4pb/1pQp1n1p/3P4/5p1P/3P2P1/r1q1R2K/8 w - - bm Rxb6+; id "WAC.050";
r1bq1r2/pp4k1/4p2p/3pPp1Q/3N1R1P/2PB4/6P1/6K1 w - - bm Rg4+; id "WAC.051";
6k1/6p1/p7/3Pn3/5p2/4rBqP/P4RP1/5QK1 b - - bm Re1; id "WAC.053";
r3kr2/1pp4p/1p1p4/7q/4P1n1/2PP2Q1/PP4P1/R1BB2K1 b q - bm Qh1+; id "WAC.054";
r3r1k1/pp1q1pp1/4b1p1/3p2B1/3Q1R2/8/PPP3PP/4R1K1 w - - bm Qxg7+; id "WAC.055";
r1bqk2r/pppp1ppp/5n2/2b1n3/4P3/1BP3Q1/PP3PPP/RNB1K1NR b KQkq - bm Bxf2+; id "WAC.056";
r3q1kr/ppp5/3p2pQ/8/3PP1b1/5R2/PPP3P1/5RK1 w - - bm Rf8+; id "WAC.057";
8/8/2R5/1p2qp1k/1P2r3/2PQ2P1/5K2/8 w - - bm Qd1+; id "WAC.058";
r1b2rk1/2p1qnbp/p1pp2p1/5p2/2PQP3/1PN2N1P/PB3PP1/3R1RK1 w - - bm Nd5; id "WAC.059";
6r1/3Pn1qk/p1p1P1rp/2Q2p2/2P5/1P4P1/P3R2P/5RK1 b - - bm Rxg3+; id "WAC.062";
r1brnbk1/ppq2pp1/4p2p/4N3/3P4/P1PB1Q2/3B1PPP/R3R1K1 w - - bm Nxf7; id "WAC.063";
8/6pp/3q1p2/3n1k2/1P6/3NQ2P/5PP1/6K1 w - - bm g4+; id "WAC.064";
1r1r1qk1/p2n1p1p/bp1Pn1pQ/2pNp3/2P2P1N/1P5B/P6P/3R1RK1 w - - bm Ne7+; id "WAC.065";
1k1r2r1/ppq5/1bp4p/3pQ3/8/2P2N2/PP4P1/R4R1K b - - bm Qxe5; id "WAC.066";
3r2k1/p2q4/1p4p1/3rRp1p/5P1P/6PK/P3R3/3Q4 w - - bm Rxd5; id "WAC.067";
6k1/5ppp/1q6/2b5/8/2R1pPP1/1P2Q2P/7K w - - bm Qxe3; id "WAC.068";
2kr3r/pppq1ppp/3p1n2/bQ2p3/1n1PP3/1PN1BN1P/1PP2PP1/2KR3R b - - bm Na2+; id "WAC.070";
2kr3r/pp1q1ppp/5n2/1Nb5/2Pp1B2/7Q/P4PPP/1R3RK1 w - - bm Nxa7+; id "WAC.071";
r3r1k1/pp1n1ppp/2p5/4Pb2/2B2P2/B1P5/P5PP/R2R2K1 w - - bm e6; id "WAC.072";
r1q3rk/1ppbb1p1/4Np1p/p3pP2/P3P3/2N4R/1PP1Q1PP/3R2K1 w - - bm Qd2; id "WAC.073";
r3r1k1/pppq1ppp/8/8/1Q4n1/7P/PPP2PP1/RNB1R1K1 b - - bm Qd6; id "WAC.075";
r1b1qrk1/2p2ppp/pb1pnn2/1p2pNB1/3PP3/1BP5/PP2QPPP/RN1R2K1 w - - bm Bxf6; id "WAC.076";
3r2k1/ppp2ppp/6q1/b4n2/3nQB2/2p5/P4PPP/RN3RK1 b - - bm Ng3; id "WAC.077";
r2q3r/ppp2k2/4nbp1/5Q1p/2P1NB2/8/PP3P1P/3RR1K1 w - - bm Ng5+; id "WAC.078";
r4rk1/p1B1bpp1/1p2pn1p/8/2PP4/3B1P2/qP2QP1P/3R1RK1 w - - bm Ra1; id "WAC.080";
r4rk1/1bR1bppp/4pn2/1p2N3/1P6/P3P3/4BPPP/3R2K1 b - - bm Bd6; id "WAC.081";
3rr1k1/pp3pp1/4b3/8/2P1B2R/6QP/P3q1P1/5R1K w - - bm Bh7+; id "WAC.082";
r2q1r1k/2p1b1pp/p1n5/1p1Q1bN1/4n3/1BP1B3/PP3PPP/R4RK1 w - - bm Qg8+; id "WAC.084";
8/p7/1ppk1n2/5ppp/P1PP4/2P1K1P1/5N1P/8 b - - bm Ng4+; id "WAC.086";
8/p3k1p1/4r3/2ppNpp1/PP1P4/2P3KP/5P2/8 b - - bm Rxe5; id "WAC.087";
r6k/p1Q4p/2p1b1rq/4p3/B3P3/4P3/PPP3P1/4RRK1 b - - bm Rxg2+; id "WAC.088";
3qrrk1/1pp2pp1/1p2bn1p/5N2/2P5/P1P3B1/1P4PP/2Q1RRK1 w - - bm Nxg7; id "WAC.090";
2qr2k1/4b1p1/2p2p1p/1pP1p3/p2nP3/PbQNB1PP/1P3PK1/4RB2 b - - bm Be6; id "WAC.091";
r4rk1/1p2ppbp/p2pbnp1/q7/3BPPP1/2N2B2/PPP4P/R2Q1RK1 b - - bm Bxg4; id "WAC.092";
r1b1k1nr/pp3pQp/4pq2/3pn3/8/P1P5/2P2PPP/R1B1KBNR w KQkq - bm Bh6; id "WAC.093";
8/k7/p7/3Qp2P/n1P5/3KP3/1q6/8 b - - bm e4+; id "WAC.094";
2r5/1r6/4pNpk/3pP1qp/8/2P1QP2/5PK1/R7 w - - bm Ng4+; id "WAC.095";
6k1/5p2/p5np/4B3/3P4/1PP1q3/P3r1QP/6RK w - - bm Qa8+; id "WAC.097";
1r3rk1/5pb1/p2p2p1/Q1n1q2p/1NP1P3/3p1P1B/PP1R3P/1K2R3 b - - bm Nxe4; id "WAC.098";
r1bq1r1k/1pp1Np1p/p2p2pQ/4R3/n7/8/PPPP1PPP/R1B3K1 w - - bm Rh5; id "WAC.099";
8/k1b5/P4p2/1Pp2p1p/K1P2P1P/8/3B4/8 w - - bm Be3 b6+; id "WAC.100";
5rk1/p5pp/8/8/2Pbp3/1P4P1/7P/4RN1K b - - bm Bc3; id "WAC.101";
6k1/2pb1r1p/3p1PpQ/p1nPp3/1q2P3/2N2P2/PrB5/2K3RR w - - bm Qxg6+; id "WAC.103";
5n2/pRrk2p1/P4p1p/4p3/3N4/5P2/6PP/6K1 w - - bm Nb5; id "WAC.107";
r5k1/1q4pp/2p5/p1Q5/2P5/5R2/4RKPP/r7 w - - bm Qe5; id "WAC.108";
rn2k1nr/pbp2ppp/3q4/1p2N3/2p5/QP6/PB1PPPPP/R3KB1R b KQkq - bm c3; id "WAC.109";
2kr4/bp3p2/p2p2b1/P7/2q5/1N4B1/1PPQ2P1/2KR4 b - - bm Be3; id "WAC.110";
6k1/p5p1/5p2/2P2Q2/3pN2p/3PbK1P/7P/6q1 b - - bm Qf1+; id "WAC.111";
r4kr1/ppp5/4bq1b/7B/2PR1Q1p/2N3P1/PP3P1P/2K1R3 w - - bm Rxe6; id "WAC.112";
rnbqkb1r/1p3ppp/5N2/1p2p1B1/2P5/8/PP2PPPP/R2QKB1R b KQkq - bm Qxf6; id "WAC.113";
r1b1rnk1/1p4pp/p1p2p2/3pN2n/3P1PPq/2NBPR1P/PPQ5/2R3K1 w - - bm Bxh7+; id "WAC.114";
4N2k/5rpp/1Q6/p3q3/8/P5P1/1P3P1P/5K2 w - - bm Nd6; id "WAC.115";
r2r2k1/2p2ppp/p7/1p2P1n1/P6q/5P2/1PB1QP1P/R5RK b - - bm Rd2; id "WAC.116";
3r1rk1/q4ppp/p1Rnp3/8/1p6/1N3P2/PP3QPP/3R2K1 b - - bm Ne4; id "WAC.117";
r5k1/pb2rpp1/1p6/2p4q/5R2/2PB2Q1/P1P3PP/5R1K w - - bm Rh4; id "WAC.118";
r2qr1k1/p1p2ppp/2p5/2b5/4nPQ1/3B4/PPP3PP/R1B2R1K b - - bm Qxd3; id "WAC.119";
6k1/5p1p/2bP2pb/4p3/2P5/1p1pNPPP/1P1Q1BK1/1q6 b - - bm Bxf3+; id "WAC.121";
1k6/ppp4p/1n2pq2/1N2Rb2/2P2Q2/8/P4KPP/3r1B2 b - - bm Rxf1+; id "WAC.122";
6k1/3r4/2R5/P5P1/1P4p1/8/4rB2/6K1 b - - bm g3; id "WAC.124";
r1bqr1k1/pp3ppp/1bp5/3n4/3B4/2N2P1P/PPP1B1P1/R2Q1RK1 b - - bm Bxd4+; id "WAC.125";
r5r1/pQ5p/1qp2R2/2k1p3/4P3/2PP4/P1P3PP/6K1 w - - bm Rxc6+; id "WAC.126";
2k4r/1pr1n3/p1p1q2p/5pp1/3P1P2/P1P1P3/1R2Q1PP/1RB3K1 w - - bm Rxb7; id "WAC.127";
6rk/1pp2Qrp/3p1B2/1pb1p2R/3n1q2/3P4/PPP3PP/R6K w - - bm Qg6; id "WAC.128";
3r1r1k/1b2b1p1/1p5p/2p1Pp2/q1B2P2/4P2P/1BR1Q2K/6R1 b - - bm Bf3; id "WAC.129";
6k1/1pp3q1/5r2/1PPp4/3P1pP1/3Qn2P/3B4/4R1K1 b - - bm Qh6; id "WAC.130";
r1b1k2r/1pp1q2p/p1n3p1/3QPp2/8/1BP3B1/P5PP/3R1RK1 w kq - bm Bh4; id "WAC.133";
3r2k1/p6p/2Q3p1/4q3/2P1p3/P3Pb2/1P3P1P/2K2BR1 b - - bm Rd1+; id "WAC.134";
3r1r1k/N2qn1pp/1p2np2/2p5/2Q1P2N/3P4/PP4PP/3R1RK1 b - - bm Nd4; id "WAC.135";
3b1rk1/1bq3pp/5pn1/1p2rN2/2p1p3/2P1B2Q/1PB2PPP/R2R2K1 w - - bm Rd7; id "WAC.137";
r1bq3r/ppppR1p1/5n1k/3P4/6pP/3Q4/PP1N1PP1/5K1R w - - bm h5; id "WAC.138";
rnb3kr/ppp2ppp/1b6/3q4/3pN3/Q4N2/PPP2KPP/R1B1R3 w - - bm Nf6+; id "WAC.139";
r2b1rk1/pq4p1/4ppQP/3pB1p1/3P4/2R5/PP3PP1/5RK1 w - - bm Bc7 Rc7; id "WAC.140";
4r1k1/p1qr1p2/2pb1Bp1/1p5p/3P1n1R/1B3P2/PP3PK1/2Q4R w - - bm Qxf4; id "WAC.141";
5b2/pp2r1pk/2pp1pRp/4rP1N/2P1P3/1P4QP/P3q1P1/5R1K w - - bm Rxh6+; id "WAC.143";
r2q1rk1/pp3ppp/2p2b2/8/B2pPPb1/7P/PPP1N1P1/R2Q1RK1 b - - bm d3; id "WAC.144";
r2r2k1/ppqbppbp/2n2np1/2pp4/6P1/1P1PPNNP/PBP2PB1/R2QK2R b KQ - bm Nxg4; id "WAC.147";
2r1k3/6pr/p1nBP3/1p3p1p/2q5/2P5/P1R4P/K2Q2R1 w - - bm Rxg7; id "WAC.148";
6k1/6p1/2p4p/4Pp2/4b1qP/2Br4/1P2RQPK/8 b - - bm Bxg2; id "WAC.149";
8/3b2kp/4p1p1/pr1n4/N1N4P/1P4P1/1K3P2/3R4 w - - bm Nc3; id "WAC.151";
1br2rk1/1pqb1ppp/p3pn2/8/1P6/P1N1PN1P/1B3PP1/1QRR2K1 w - - bm Ne4; id "WAC.152";
r1b2rk1/2p2ppp/p7/1p6/3P3q/1BP3bP/PP3QP1/RNB1R1K1 w - - bm Qxf7+; id "WAC.154";
5bk1/1rQ4p/5pp1/2pP4/3n1PP1/7P/1q3BB1/4R1K1 w - - bm d6; id "WAC.155";
r1b1qN1k/1pp3p1/p2p3n/4p1B1/8/1BP4Q/PP3KPP/8 w - - bm Qxh6+; id "WAC.156";
5rk1/p4ppp/2p1b3/3Nq3/4P1n1/1p1B2QP/1PPr2P1/1K2R2R w - - bm Ne7+; id "WAC.157";
r1b2r2/5P1p/ppn3pk/2p1p1Nq/1bP1PQ2/3P4/PB4BP/1R3RK1 w - - bm Ne6+; id "WAC.159";
r3kbnr/p4ppp/2p1p3/8/Q1B3b1/2N1B3/PP3PqP/R3K2R w KQkq - bm Bd5; id "WAC.162";
5rk1/2p4p/2p4r/3P4/4p1b1/1Q2NqPp/PP3P1K/R4R2 b - - bm Qg2+; id "WAC.163";
8/6pp/4p3/1p1n4/1NbkN1P1/P4P1P/1PR3K1/r7 w - - bm Rxc4+; id "WAC.164";
1r5k/p1p3pp/8/8/4p3/P1P1R3/1P1Q1qr1/2KR4 w - - bm Re2; id "WAC.165";
r3r1k1/5pp1/p1p4p/2Pp4/8/q1NQP1BP/5PP1/4K2R b K - bm d4; id "WAC.166";
r3k2r/pb1q1p2/8/2p1pP2/4p1p1/B1P1Q1P1/P1P3K1/R4R2 b kq - bm Qd2+; id "WAC.168";
5rk1/1pp3bp/3p2p1/2PPp3/1P2P3/2Q1B3/4q1PP/R5K1 b - - bm Bh6; id "WAC.169";
5r1k/6Rp/1p2p3/p2pBp2/1qnP4/4P3/Q4PPP/6K1 w - - bm Qxc4; id "WAC.170";
2rq4/1b2b1kp/p3p1p1/1p1nNp2/7P/1B2B1Q1/PP3PP1/3R2K1 w - - bm Bh6+; id "WAC.171";
2r1b3/1pp1qrk1/p1n1P1p1/7R/2B1p3/4Q1P1/PP3PP1/3R2K1 w - - bm Qh6+; id "WAC.173";
r5k1/pppb3p/2np1n2/8/3PqNpP/3Q2P1/PPP5/R4RK1 w - - bm Nh5; id "WAC.175";
3r2k1/p1rn1p1p/1p2pp2/6q1/3PQNP1/5P2/P1P4R/R5K1 w - - bm Nxe6; id "WAC.178";
r1q2rk1/p3bppb/3p1n1p/2nPp3/1p2P1P1/6NP/PP2QPB1/R1BNK2R b KQ - bm Nxd5; id "WAC.180";
r3k2r/2p2p2/p2p1n2/1p2p3/4P2p/1PPPPp1q/1P5P/R1N2QRK b kq - bm Ng4; id "WAC.181";
r1b2rk1/ppqn1p1p/2n1p1p1/2b3N1/2N5/PP1BP3/1B3PPP/R2QK2R w KQ - bm Qh5; id "WAC.182";
6k1/5p2/p3p3/1p3qp1/2p1Qn2/2P1R3/PP1r1PPP/4R1K1 b - - bm Nh3+; id "WAC.187";
3RNbk1/pp3p2/4rQpp/8/1qr5/7P/P4P2/3R2K1 w - - bm Qg7+; id "WAC.188";
8/p2b2kp/1q1p2p1/1P1Pp3/4P3/3B2P1/P2Q3P/2Nn3K b - - bm Bh3; id "WAC.190";
r3k3/ppp2Npp/4Bn2/2b5/1n1pp3/N4P2/PPP3qP/R2QKR2 b Qq - bm Nd3+; id "WAC.192";
5rk1/ppq2ppp/2p5/4bN2/4P3/6Q1/PPP2PPP/3R2K1 w - - bm Nh6+; id "WAC.194";
3r1rk1/1p3p2/p3pnnp/2p3p1/2P2q2/1P5P/PB2QPPN/3RR1K1 w - - bm g3; id "WAC.195";
rr4k1/p1pq2pp/Q1n1pn2/2bpp3/4P3/2PP1NN1/PP3PPP/R1B1K2R b KQ - bm Nb4; id "WAC.196";
7k/1p4p1/7p/3P1n2/4Q3/2P2P2/PP3qRP/7K b - - bm Qf1+; id "WAC.197";
2br2k1/ppp2p1p/4p1p1/4P2q/2P1Bn2/2Q5/PP3P1P/4R1RK b - - bm Rd3; id "WAC.198";
2rqrn1k/pb4pp/1p2pp2/n2P4/2P3N1/P2B2Q1/1B3PPP/2R1R1K1 w - - bm Bxf6; id "WAC.200";
2b2r1k/4q2p/3p2pQ/2pBp3/8/6P1/1PP2P1P/R5K1 w - - bm Ra7; id "WAC.201";
QR2rq1k/2p3p1/3p1pPp/8/4P3/8/P1r3PP/1R4K1 b - - bm Rxa2; id "WAC.202";
r4rk1/5ppp/p3q1n1/2p2NQ1/4n3/P3P3/1B3PPP/1R3RK1 w - - bm Qh6; id "WAC.203";
r1b1qrk1/1p3ppp/p1p5/3Nb3/5N2/P7/1P4PQ/K1R1R3 w - - bm Rxe5; id "WAC.204";
r3rnk1/1pq2bb1/p4p2/3p1Pp1/3B2P1/1NP4R/P1PQB3/2K4R w - - bm Qxg5; id "WAC.205";
1Qq5/2P1p1kp/3r1pp1/8/8/7P/p4PP1/2R3K1 b - - bm Rc6; id "WAC.206";
r1bq2kr/p1pp1ppp/1pn1p3/4P3/2Pb2Q1/BR6/P4PPP/3K1BNR w - - bm Qxg7+; id "WAC.207";
3r1bk1/ppq3pp/2p5/2P2Q1B/8/1P4P1/P6P/5RK1 w - - bm Bf7+; id "WAC.208";
3r1rk1/pp1q1ppp/3pn3/2pN4/5PP1/P5PQ/1PP1B3/1K1R4 w - - bm Rh1; id "WAC.210";
rn1qr2Q/pbppk1p1/1p2pb2/4N3/3P4/2N5/PPP3PP/R4RK1 w - - bm Qxg7+; id "WAC.212";
3r1r1k/1b4pp/ppn1p3/4Pp1R/Pn5P/3P4/4QP2/1qB1NKR1 w - - bm Rxh7+; id "WAC.213";
3r2k1/pb1q1pp1/1p2pb1p/8/3N4/P2QB3/1P3PPP/1Br1R1K1 w - - bm Qh7+; id "WAC.215";
7k/p4q1p/1pb5/2p5/4B2Q/2P1B3/P6P/7K b - - bm Qf1+; id "WAC.219";
3rr1k1/ppp2ppp/8/5Q2/4n3/1B5R/PPP1qPP1/5RK1 b - - bm Qxf1+; id "WAC.220";
2r1r2k/1q3ppp/p2Rp3/2p1P3/6QB/p3P3/bP3PPP/3R2K1 w - - bm Bf6; id "WAC.222";
2k1rb1r/ppp3pp/2np1q2/5b2/2B2P2/2P1BQ2/PP1N1P1P/2KR3R b - - bm d5; id "WAC.227";
r4rk1/1bq1bp1p/4p1p1/p2p4/3BnP2/1N1B3R/PPP3PP/R2Q2K1 w - - bm Bxe4; id "WAC.228";
r4rk1/1b1nqp1p/p5p1/1p2PQ2/2p5/5N2/PP3PPP/R1BR2K1 w - - bm Bg5; id "WAC.231";
1R6/p5pk/4p2p/4P3/8/2r3qP/P3R1b1/4Q1K1 b - - bm Rc1; id "WAC.236";
r5k1/pQp2qpp/8/4pbN1/3P4/6P1/PPr4P/1K1R3R b - - bm Rc1+; id "WAC.237";
1k1r4/pp1r1pp1/4n1p1/2R5/2Pp1qP1/3P2QP/P4PB1/1R4K1 w - - bm Bxb7; id "WAC.238";
2b4k/p1b2p2/2p2q2/3p1PNp/3P2R1/3B4/P1Q2PKP/4r3 w - - bm Qxc6; id "WAC.240";
r1b1r1k1/pp1nqp2/2p1p1pp/8/4N3/P1Q1P3/1P3PPP/1BRR2K1 w - - bm Rxd7; id "WAC.242";
1b5k/7P/p1p2np1/2P2p2/PP3P2/4RQ1R/q2r3P/6K1 w - - bm Re8+; id "WAC.250";
k5r1/p4b2/2P5/5p2/3P1P2/4QBrq/P5P1/4R1K1 w - - bm Qe8+; id "WAC.253";
r6k/pp3p1p/2p1bp1q/b3p3/4Pnr1/2PP2NP/PP1Q1PPN/R2B2RK b - - bm Nxh3; id "WAC.254";
3r3r/p4pk1/5Rp1/3q4/1p1P2RQ/5N2/P1P4P/2b4K w - - bm Rfxg6+; id "WAC.255";
3r1rk1/1pb1qp1p/2p3p1/p7/P2Np2R/1P5P/1BP2PP1/3Q1BK1 w - - bm Nf5; id "WAC.256";
4r1k1/pq3p1p/2p1r1p1/2Q1p3/3nN1P1/1P6/P1P2P1P/3RR1K1 w - - bm Rxd4; id "WAC.257";
r3brkn/1p5p/2p2Ppq/2Pp3B/3Pp2Q/4P1R1/6PP/5R1K w - - bm Bxg6; id "WAC.258";
2r2b1r/p1Nk2pp/3p1p2/N2Qn3/4P3/q6P/P4PP1/1R3K1R w - - bm Qe6+; id "WAC.260";
6k1/p1B1b2p/2b3r1/2p5/4p3/1PP1N1Pq/P2R1P2/3Q2K1 b - - bm Rh6; id "WAC.262";
rnbqr2k/pppp1Qpp/8/b2NN3/2B1n3/8/PPPP1PPP/R1B1K2R w KQ - bm Qg8+; id "WAC.263";
2r1k2r/2pn1pp1/1p3n1p/p3PP2/4q2B/P1P5/2Q1N1PP/R4RK1 w k - bm exf6; id "WAC.265";
r3q2r/2p1k1p1/p5p1/1p2Nb2/1P2nB2/P7/2PNQbPP/R2R3K b - - bm Rxh2+; id "WAC.266";
2r1kb1r/pp3ppp/2n1b3/1q1N2B1/1P2Q3/8/P4PPP/3RK1NR w Kk - bm Nc7+; id "WAC.267";
2kr2nr/pp1n1ppp/2p1p3/q7/1b1P1B2/P1N2Q1P/1PP1BPP1/R3K2R w KQ - bm axb4; id "WAC.269";
2r1r1k1/pp1q1ppp/3p1b2/3P4/3Q4/5N2/PP2RPPP/4R1K1 w - - bm Qg4; id "WAC.270";
2kr4/ppp3Pp/4RP1B/2r5/5P2/1P6/P2p4/3K4 w - - bm Rd6; id "WAC.271";
nrq4r/2k1p3/1p1pPnp1/pRpP1p2/P1P2P2/2P1BB2/1R2Q1P1/6K1 w - - bm Bxc5; id "WAC.272";
r2qkb1r/pppb2pp/2np1n2/5pN1/2BQP3/2N5/PPP2PPP/R1B1K2R w KQkq - bm Bf7+; id "WAC.278";
2R5/2R4p/5p1k/6n1/8/1P2QPPq/r7/6K1 w - - bm Rxh7+; id "WAC.281";
6k1/2p3p1/1p1p1nN1/1B1P4/4PK2/8/2r3b1/7R w - - bm Rh8+; id "WAC.282";
3q1rk1/4bp1p/1n2P2Q/3p1p2/6r1/Pp2R2N/1B4PP/7K w - - bm Ng5; id "WAC.283";
3r1k2/1p6/p4P2/2pP2Qb/8/1P1KB3/P6r/8 b - - bm Rxd5+; id "WAC.286";
r1b2rk1/p4ppp/1p1Qp3/4P2N/1P6/8/P3qPPP/3R1RK1 w - - bm Nf6+; id "WAC.288";
2r3k1/5p1p/p3q1p1/2n3P1/1p1QP2P/1P4N1/PK6/2R5 b - - bm Qe5; id "WAC.289";
4r3/1Q1qk2p/p4pp1/3Pb3/P7/6PP/5P2/4R1K1 w - - bm d6+; id "WAC.292";
1nbq1r1k/3rbp1p/p1p1pp1Q/1p6/P1pPN3/5NP1/1P2PPBP/R4RK1 w - - bm Nfg5; id "WAC.293";
4r3/p4r1p/R1p2pp1/1p1bk3/4pNPP/2P1K3/2P2P2/3R4 w - - bm Rxd5+; id "WAC.295";
3Q4/p3b1k1/2p2rPp/2q5/4B3/P2P4/7P/6RK w - - bm Qh8+; id "WAC.298";
b2b1r1k/3R1ppp/4qP2/4p1PQ/4P3/5B2/4N1K1/8 w - - bm g6; id "WAC.300";

Thank for sharing. People also forget WAC300 was designed for humans to sharpen their tactics, not computers. As an example, the point of WAC227 was to show that you can play d5 safely, and win the piece - but what gets lost ( meaning it is not displayed in the computer pv analysis) is that Bxd5 loses to Qxc3+, bc3, Ba3#. Still a great set for humans to hone there their tactical skills on and it's nice to have a cleaner position set.

Absolutely, though it needs to be noted that the issue I had, and are the 95% of the ones I removed, are ones that are either wrong, or have multiple solutions. Even as a human solver, i find it very annoying to be told "white to play and win" and after serious searching I find a move, and am told it is not the right move. Except later, I find that my choice is winning also.

On my computer, a quad i5 with a GTX1060 6GB, I ran a number of NN versions to gauge their performance. The engines were given exactly 10 seconds per position. Here are the results:

NN223: 94 of 200 matching moves
NN237: 94 of 200 matching moves
NN277: 82 of 200 matching moves
NN302: 90 of 200 matching moves
NN314: 89 of 200 matching moves

It is accepted that LC0 is much faster when running the NNs. It is also true that it is not just faster, and plays different moves often enough even at the exact same depth as LCZero v0.10. Below are tests done with it at default settings (same as v0.10) and with FPU=0 and cPUCT=3.0.

LC0 NN237 v10 settings: 99 of 200 matching moves
LC0 NN237 FPU=0; PUCT=3.0: 125 of 200 matching moves

I am also attaching a corrected version of WAC again, as I removed two positions with dual solutions, and added one of my own, dubbed WAC.301, to round it up to 200.

WACSilver200.epd

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Paloma wrote: ↑Sun May 20, 2018 10:42 pm unclickable

It's in my post above. Mike was just suggesting I get credit.