Somebody needs a good pounding. Wait... It's me.

[Dann Corbit]

These positions (below) from the STS test set have dubious solutions. For all of these, my current analysis has a different solution than the published one. Keep in mind that many of them were made with engines as old as Rybka 1.0 and some were even made on a 32 bit operating system, way back in the day. So even though they were run for at least a full hour it is not surprising that some have questionable solutions. Even the newest one (STS 15) is about 2 years old.

I would like anyone with powerful hardware and Stockfish, Komodo or Houdini software to give as many as possible a good pounding.

Now, if you can't spare a week of CPU, that's fine. Just do any that look interesting or do a few or whatever.

They need at least the equivalent of one hour per position on a machine with 4 physical cores at 3GHz, and preferably more. The longer the better. If you had only one core, then 4 hours would be needed. If you had 16 cores, then 15 minutes should be OK.

I want to revise the test set with improved solutions where possible.

In addition, if you know of any STS problems not in this set with an alternative solution, I would like to know about it.

4r1k1/R3rpp1/1p3n1p/8/2Q5/4B2P/1q3PP1/3R2K1 w - -
q5k1/4bpp1/r3p2p/2p5/1pP5/1P3NPP/1RQ1PP2/6K1 b - -
qr4k1/3b1pp1/4p2p/n2pP3/n1pP4/Q1P2NP1/3N1P1P/1R3BK1 b - -
3r1qk1/6pp/1p1np3/2n4Q/p7/P3N1P1/1B2PP1P/3R2K1 w - -
4r1k1/p5b1/P2p1pp1/q1pP3p/2Pn1BbP/2NP2P1/3Q2BK/1R6 w - -
5k2/4pp1p/r2p2p1/8/6P1/5P2/1R3B1P/2r2BK1 b - -
8/p3p1k1/1p1p1pp1/4n3/3R3P/1Pr5/P5P1/3R2K1 b - -
7k/3N1p2/p7/3p1rp1/8/1P2P2p/P4n2/2R2NK1 w - -
5rk1/p3pp1p/2Q2bp1/q1P5/3p4/5BP1/Pr2PP1P/2RR2K1 w - -
r5k1/3pppbp/6p1/4n3/1q2P3/4B3/P4PPP/2RQ1K1R w - -
5r2/1N6/2p2Pk1/p1P1P1p1/3b3p/KP1N2n1/P6R/8 b - -
5k2/p2q2p1/bp1p1p1p/3PnP1Q/1P1BP3/2P5/3N2P1/6K1 w - -
1k2r1r1/ppp1q1b1/nn1pp3/1N3p1p/1PP2P2/PQ2B1PB/4PK1P/3R2R1 b - -
r4rk1/1p5p/p3pp2/2b5/P7/2N5/1P3PPP/R2R2K1 w - -
2b3k1/p3qpbp/2p3p1/1pn1p3/4P3/PBP1NN1P/1PQ2PP1/6K1 b - -
r3r1k1/1p1q2bp/1n1p2p1/1PpPpp1n/p3P3/R1NQBN1P/1PP2PP1/4R1K1 w - -
r3r1k1/1b1nq2p/p2pNppQ/1ppP3n/P3P3/7P/1PB2PP1/R3RNK1 b - -
1q2rb2/3b1r1k/p1p4p/B3p1p1/1PPpN3/3P1P1P/3QR1P1/4R1K1 w - -
3rr1k1/1p2bppp/p1p5/P2P3q/2B1PPb1/1P1R4/3B1QP1/4R1K1 w - -
2rr2k1/5ppp/p3p3/1p2P3/1Pn5/2B1PqP1/P1Q2P1P/3RR1K1 b - -
r1r2nk1/5pp1/1pnpbq2/2B5/p1P1PN1p/8/PPNR1QP1/3R1BK1 b - -
3qr3/5pkp/p1npb1p1/3N4/2PpPP2/6P1/PQ4BP/1R5K w - -
r3k2r/1bq1bpp1/p4n2/2p1pP2/2NpP2p/3B4/PPP3PP/R1B1QR1K b k -
2r1r1k1/pb2bp1p/8/2p1Rp1q/P1N5/6P1/2Q2P1P/3R1BK1 w - -
1r2r1k1/p2bp1b1/2p1nnpp/qpP2p2/3P3P/P1N1PBPN/1BQ2P2/1R2R1K1 w - -
1q1rb1k1/5p1p/p3pnpb/P1r5/2B1P3/1P3P2/2R1N1PP/R2NQ2K b - -
2r1rk2/1p2bpp1/p4nbp/4R3/P2R1P1B/2N5/1P2B1PP/5K2 b - -
2b5/2p1r2k/1pP2q1p/p2Pp3/4R3/1PN1Q2P/P2KP3/8 w - -
5rk1/8/3p3p/p1qP2p1/Rrb1P3/3p1P2/1P1Q1RP1/3N2K1 w - -
r4rk1/pb1p2pp/1q1Ppn2/2p5/2P2P2/3BB3/PP2Q1PP/R3K2R b KQ -
r4r1k/p2nb1p1/1p2pPqp/3p4/P1pPn3/2P1BN1P/1QP1BPP1/R5RK b - -
4rk2/2p1rpp1/pbn3bp/1p2P3/PP6/1BP2NNP/5PP1/2R1R1K1 w - -
r4rk1/ppp1qp1p/2p3p1/4n3/4P2P/2N1QP2/PPP2P2/2KR3R w - -
r5k1/1p5p/p1p1qrnP/2B1pb2/R1P5/2P2B2/P2Q2P1/5RK1 w - -
q1rb2rk/1b3ppp/2n1p2n/p2pP3/B2P1PP1/Bp2RN1P/1RPNQ3/6K1 w - -
1r2r1k1/2qn1pb1/3p2pp/p1pP4/PpQ1PP2/1P4PP/1B4B1/3RR1K1 w - -
1rnr2k1/2Rb2bp/3p2p1/2pPpp2/1p5P/1P1PP1P1/3B1PK1/R4BN1 b - -
5rk1/1prn1qp1/p2p3p/3Ppp1P/7R/1NPQ1PP1/PP6/1K1R4 b - -
2r2r1k/p3ppbp/qpnp2pn/5P2/2P1PP2/P1N1BB2/1PQ3RP/3R2K1 w - -
nr2q1k1/1p2rpb1/p2p2pp/P7/1PRN4/4BBPb/3Q1P1P/2R3K1 w - -
r3r1k1/5pp1/p1n2q1p/P1bp1P2/2p2P2/5N2/2BB3P/R2QRK2 b - -
2r5/4k1p1/4p2p/1pnbPp2/3B4/2P5/1PB3PP/5R1K b - -
r5k1/5pbp/6P1/p2R4/1p5r/P5R1/1PP5/2KB4 b - -
2r1n1k1/1p1R1r1p/2q1pp1B/p5p1/6P1/Q1P4P/PP6/1K1R4 b - -
3r2k1/5p1p/p2qn1p1/P3N1r1/1P1pb1B1/2nN3P/5PPQ/2R1R2K b - -
3q4/7k/3ppp2/p3n2B/P1r1P2P/8/1PPQ4/1K3R2 w - -
1k1r2r1/1b4p1/p4n1p/1pq1pPn1/2p1P3/P1N2N2/1PB1Q1PP/3R1R1K b - -
2r3k1/4n1b1/1p1pq1p1/4p3/2r2P1P/P2NP3/1B1Q3P/4RRK1 w - -
3r2k1/pp3bbp/3q1p2/2p5/5pQ1/1P3N2/P3R1PP/4R2K w - -
r2q2kr/p3n3/1p1Bp1bp/3pP1pN/5PPn/3B3Q/2P2K2/1R5R w - -
r3k2r/ppqbnpb1/n1p1p2p/P2pP1p1/3P4/1P1BBN1P/1NPQ1PP1/R3K2R w KQkq -
2br3k/2pqb2r/p1n1n3/P3PQ2/1pB5/5N2/1P1N1PPP/R3R1K1 b - -
2rq1rk1/1p2bpp1/4p3/pP1pP1np/P2P4/R3BP2/3Q2PP/1NR3K1 w - -
1nr3k1/1pr2pp1/p3bn2/P3p2p/1PP4P/3BNPP1/3RN1K1/R7 w - -
2r3k1/2r1b3/p3p2p/3n2p1/2N1KP2/P2N2PP/2R5/2R5 b - -
3b2nk/p2Nqrpp/1pB1p3/3pPnp1/1P1P1P1P/P7/2R1QB1K/8 w - -
1r2kbQ1/1r1q1p2/p2p2n1/6P1/N1pBP3/P1N5/1PPR4/K7 w - -
r3nbk1/1b3ppp/pr6/1pp1PBq1/P1P5/7P/1B1NQPP1/R3R1K1 w - -
5nk1/1bq2pp1/rp1r1b1p/1R1p1B2/2pP4/2N1PN2/PQ3PPP/1R4K1 w - -
3r2k1/2q1rp2/4p1p1/2p1P2p/1p3Q2/1P1bP1PP/P4RBK/2R5 w - -
r2r2k1/2pq1pp1/p1p2b1p/5p2/P2P4/2N3P1/1PQ1PP1P/R2R2K1 b - -
1r1rq1k1/1p4p1/pNb1pp1p/1pP5/3P4/1PQ5/5PPP/R3R1K1 w - -
2r3k1/1q6/4p3/p2p2bp/P2P1n2/2P1NP2/1PB4B/1R2R1K1 b - -
1k1r4/4rp2/1p1qbnp1/p2p3p/P2P4/1Nn2P2/1P1QBRPP/2R3K1 w - -
6k1/q4p2/2b1p2p/4Pp2/pP3N2/Q4PP1/6KP/8 b - -
1r2qrk1/3bn3/pp1p3p/n1p1p1p1/P1P5/B1PP1NPP/2Q2PB1/1R2R1K1 w - -
r4q1k/1p2b2r/7P/p1pPp3/8/P2PP1R1/1P4Q1/1K5R w - -
r3rb2/1p3k2/p1p2p2/2q2bpp/2PR4/1PQ4P/P4PPB/3R1BK1 b - -
1rb1r1k1/4qpb1/p1np1npp/1pp5/2P1PN2/1P3PP1/PB4BP/1QRR1N1K b - -
2r1r1k1/1b1n1pp1/1q2p2p/3p3n/P2N4/BP1NPP1P/2B3P1/2R1Q1K1 w - -
r1b1qrk1/pp2bppp/4pn2/4Q1B1/8/2N5/PPP2PPP/2KR1B1R w - -
b2rrbk1/2q2p1p/pn1p2p1/1p4P1/2nNPB1P/P1N3Q1/1PP3B1/1K1RR3 w - -
5r2/4k3/2qpp2b/pN2p2n/P3PR1p/2P5/6PP/QB2R2K b - -
2qr2r1/1p3pk1/p1np1np1/7p/2P1Pp2/1PN5/3QN1PP/4RR1K w - -
r2r1k2/2b1npp1/p1np3p/1p6/3P1B2/P1N4P/1PBR1PP1/3qR1K1 w - -
2r2k1r/1q1nbpp1/p2p4/1p1Pp3/8/P1B2BP1/1PP1QP2/3RR1K1 b - -
1r6/7k/1p4r1/1P2p3/2P1p2P/2RbB3/6P1/2R4K w - -
r4rn1/2q2p1k/p2p2np/4pb1Q/1pP1P3/4B2P/2P3PN/3R1R1K w - -
2r2rk1/1pp2qpb/1n2p2p/pP1p1P2/P2PPBP1/7P/3NQ3/R1R3K1 w - -
2r1r1k1/3n2pp/b1p1pb2/1pPp1p1q/p2PnB1P/P4NP1/1PQNPPB1/R2R1K2 b - -
2r2rk1/3bqppp/2p5/p2pb2Q/Pn1P1P2/1P2PN2/6PP/R1B2RK1 w - -
4r1k1/3b1q2/2pn1p1b/1p3P2/p2PN1PP/P4Q2/1P4R1/4R1K1 b - -
r2qk2r/3nbpp1/2bBp2p/p3P3/1p6/8/PPPQBPPP/1NKR3R w kq -
2r5/1b2kp1p/3qp1p1/1B6/3pn2N/8/PP2QPPP/4R1K1 b - -
r5k1/1pp1r1pp/3pbpq1/pB2n3/P1P5/1P2BP2/2PQ2PP/2KRR3 w - -
1k2r3/1p1bP3/2p2p1Q/Ppb5/4Rp1P/2q2N1P/5PB1/6K1 b - -
r5k1/p1q2pbp/Ppp1bnp1/4p1B1/Q1P1P3/2N4P/1P2BPP1/5RK1 w - -
r2r2k1/4qp2/p5p1/2p4p/5P2/3RP1K1/PPQ4P/3R4 b - -
r4rk1/pp5p/2pp2pb/2n1nq2/2P2P2/2N1B3/PP2B1PP/2RQR1K1 w - -
2r1q1k1/2p2rbp/p2p2p1/Q2P4/b3P3/3p2P1/3B1PBP/2R1R1K1 w - -
1r6/8/1r5p/p2pk3/4p3/2P4P/RP2B1n1/1RK5 b - -
1r2rqk1/8/bn1p3p/B1p2p2/p1PnpP2/P3R2Q/1P3NPP/2R2BK1 b - -
3rr3/p3b1kp/2p2pp1/1q1npb2/4N1PB/1NP2Q2/PP3P1P/R2R2K1 b - -
r4rk1/1bq2pp1/1p1bpn1p/p2nN3/P1BP4/5NP1/1P1BQPKP/R3R3 b - -
1k1r3r/pb1q2p1/B4p2/2p4p/Pp1bPPn1/7P/1P2Q1P1/R1BN1R1K b - -
8/1p1bkq2/p2pp1n1/P1b1p1P1/4P1QN/1KNB4/1PP5/8 b - -
2r2bk1/R4pp1/3pqnnp/R3p3/1P2P3/3Q1NNP/2rB1PPK/8 w - -
1r1r2k1/2p1qpp1/pnP1b2p/1p2P3/3N4/P3P2P/1QB2PP1/3RR1K1 w - -
r4rk1/1b1q1ppp/pb1p1nn1/1pp1p3/1PP1P3/P2PNN1P/B2B1PP1/2RQR1K1 w - -
r2r2k1/p2n1p2/4q2p/3p2p1/1PpB4/P1NnPP2/2Q3PP/R2R2K1 b - -
r3rnk1/1bpq1pp1/p2p3p/1p1Pp1b1/P3P1P1/1BP1N1P1/1P3P2/R1BQR1K1 w - -
r1b1r1k1/4q1pp/1bp1pp2/np6/3PN3/3NP1PB/R1Q2P1P/3R2K1 b - -
2k2r1r/1b4p1/1nq1p3/1p5p/5P2/1Pp1B1KP/2B1QRP1/R7 w - -
5rk1/2p1q2p/1r2p2Q/3nNp2/8/6P1/1P3P1P/2RR2K1 w - -
5r1k/2p3q1/1p1npr2/pPn1N1pp/P1PN4/R4PPP/4Q1K1/3R4 w - -
r1bq1rk1/ppp3bp/n2p1pp1/3P4/2P1Pp2/2N2N1P/PP2BPP1/R2QR1K1 w - -
r1qr2k1/4bp2/p1p1p1p1/2pb4/PP1P1P2/3NQ3/5BPP/R2R2K1 w - -
2n2rk1/p2b2bp/3p2p1/q1pPp2n/P1P1P3/1QN5/3BBNPP/1R4K1 w - -
qr4k1/6b1/r6p/P2p1pp1/1B1P4/Q2NP1P1/5P1P/2R3K1 w - -
1r3r2/1p3q1k/1Q1p4/2pNbpp1/2P5/7P/PP2R1P1/3R3K b - -
r3r1k1/4bppp/pnq5/1pp1P2b/4NB2/1P2QN2/1P3PPP/3RR1K1 w - -
1k1r3r/1p1b1Q1p/p7/q3p3/4p3/2P1N3/P4PPP/R4RK1 w - -
5rk1/5bpp/8/r2p1P2/3Bp1P1/1BR1P1K1/1n5P/2R5 w - -
3q3k/5p1p/3rp3/p4p1P/PbP2Q2/1p3N2/1P2KPP1/1R6 b - -
r4rk1/1p1qn1bp/p1npp1p1/2p1p3/4P2P/N1PPB1P1/1P3PB1/R2QR1K1 w - -
1r1q1rk1/1b1n1p1p/p2b1np1/3pN3/3P1P2/P1N5/3BB1PP/1R1Q1RK1 b - -
7k/4r1p1/1p1b3p/p4q2/8/P5PP/1P1NQPK1/4R3 w - -

[zullil]

These positions (below) from the STS test set have dubious solutions. For all of these, my current analysis has a different solution than the published one. Keep in mind that many of them were made with engines as old as Rybka 1.0 and some were even made on a 32 bit operating system, way back in the day. So even though they were run for at least a full hour it is not surprising that some have questionable solutions. Even the newest one (STS 15) is about 2 years old.

I would like anyone with powerful hardware and Stockfish, Komodo or Houdini software to give as many as possible a good pounding.

Now, if you can't spare a week of CPU, that's fine. Just do any that look interesting or do a few or whatever.

They need at least the equivalent of one hour per position on a machine with 4 physical cores at 3GHz, and preferably more. The longer the better. If you had only one core, then 4 hours would be needed. If you had 16 cores, then 15 minutes should be OK.

I want to revise the test set with improved solutions where possible.

In addition, if you know of any STS problems not in this set with an alternative solution, I would like to know about it.

[D] 4r1k1/R3rpp1/1p3n1p/8/2Q5/4B2P/1q3PP1/3R2K1 w - -

Latest Stockfish:

Code: Select all

info depth 47 seldepth 66 multipv 1 score cp 1 nodes 330427432589 nps 43659145 hashfull 999 tbhits 303102188 time 7568344 pv a7a2 b2e5 e3b6 e7d7 d1d7 f6d7 b6e3 d7f6 c4d3 f6d5 a2a5 e8d8 e3d2 e5d6 h3h4 d6d7 d3d4 d5e7 d4d7 d8d7 d2e1 f7f6 h4h5 g8f7 g1h2 e7d5 e1d2 d5e7 d2e3 d7d5 a5d5 e7d5 e3d2 f6f5 h2g3 d5f6 g3h4 f6e4 d2e3 e4f6 e3d4 f6d5 d4e5 f7g8 h4g3 g8f7 f2f3 d5f6 g3h4 f6d5

info depth 47 seldepth 66 multipv 2 score cp 0 nodes 330427432589 nps 43659145 hashfull 999 tbhits 303102189 time 7568344 pv a7e7 e8e7 e3d4 b2e2 c4e2 e7e2 d4b6 e2e6 b6a7 g8h7 f2f3 g7g5 g2g4 h7g6 g1f2 e6a6 a7e3 a6a2 f2g3 h6h5 h3h4 g5h4 g3h4 h5g4 f3g4 a2h2 h4g3 h2a2 d1d6 a2a3 g3f2 a3e3 f2e3

[zullil]

[D] q5k1/4bpp1/r3p2p/2p5/1pP5/1P3NPP/1RQ1PP2/6K1 b - -

Latest Stockfish:

Code: Select all

info depth 53 seldepth 80 multipv 1 score cp 34 nodes 855669101444 nps 43600082 hashfull 999 tbhits 165511857 time 19625401 pv g7g6 c2d3 e7f6 b2d2 g8g7 d2d1 a8c6 f3d2 f6d4 d2f3 d4c3 f3d2 a6a7 d2e4 c3d4 e2e3 d4e5 f2f4 e5f6 e4f6 g7f6 g1f2 f6g7 g3g4 a7a2 d1d2 a2d2 d3d2 c6h1 d2b2 g7g8 b2e5 h1h2 f2e1 h2g3 e1d2 g3f2 d2c1 f2e1 c1b2 e1e2 b2c1 e2f2 c1b1 f2f1 b1c2 f1g2 c2c1 g2h3 e5c5 h3g4 c5b4 h6h5 b4d2 g8h7 d2d7 g4f5 d7d8 f5h3 c1d2 h5h4 d8f6 h7g8 f6d8 g8g7 d8d4 g7h7 d4e4 h3f5

info depth 53 seldepth 80 multipv 2 score cp 30 nodes 855669101444 nps 43600082 hashfull 999 tbhits 165511857 time 19625401 pv e7f6 b2b1 a6a2 c2d3 g7g6 d3e3 g8g7 b1d1 a8a7 e3e4 f6c3 h3h4 a7c7 g1f1 a2a3 d1b1 c7a7 f3e1 a3a2 e1d3 a2d2 f1g2 a7a2 d3c1 a2a3 c1d3 a3a7 b1f1 c3d4 f1e1 h6h5 d3e5 d4c3 e5f3 d2d8 e1f1 a7d7 f3g5 c3f6 g5f3 d7e7 e4e3 e7d6 e3e4 d6c7 f3g5 d8d7 g5f3 c7d6 f1h1 d6e7 h1b1 d7d8 b1f1 e7d6 e4c2 g7f8 c2e4 f8g8 f1b1

[Leto]

What are the current solutions? Or where can I find them?

[Dann Corbit]

See:
http://www.talkchess.com/forum/viewtopic.php?t=59153

One of the problems that had a different solution returned to the given solution in my own test (I am only part way through).

The test set is given in a format that gives partial credit for other answers.
I will have to revisit all of those as well.

[zullil]

[D] qr4k1/3b1pp1/4p2p/n2pP3/n1pP4/Q1P2NP1/3N1P1P/1R3BK1 b - -

Latest Stockfish (forgot to stop search, so very deep):

Code: Select all

info depth 54 seldepth 83 multipv 1 score cp 37 nodes 2052013958764 nps 38881179 hashfull 999 tbhits 1374379566 time 52776536 pv b8b1 d2b1 a8b7 f3d2 a5b3 d2b3 b7b3 a3b3 c4b3 c3c4 a4b6 c4d5 e6d5 f1d3 b6c4 g1f1 c4b2 d3e2 d7f5 b1d2 f5c2 f1e1 g7g5 f2f4 g5g4 d2b3 c2b3 e2g4 b2c4 e1e2 c4a3 e2d2 a3b5 g4d7 b3c4 d2e3 b5a3 d7a4 c4f1 f4f5 g8f8 g3g4 a3c4 e3f4 c4b2 a4d7 b2d3 f4e3 d3b4 e3d2 f8e7 d7c8 b4c6 d2e3 e7d8 c8b7 f1b5 h2h4 d8c7 b7c6 c7c6 h4h5 c6d7 e3f4 b5c4 g4g5

info depth 54 seldepth 83 multipv 2 score cp 20 nodes 2052013958764 nps 38881179 hashfull 999 tbhits 1374379567 time 52776536 pv b8b7 b1b7 a8b7 f1e2 b7b2 a3b2 a4b2 g1f1 d7e8 d2b1 f7f6 e5f6 g7f6 f1e1 a5b7 f3h4 b7d6 f2f3 d6b5 f3f4 b5d6 e1d2 b2a4 d2c2 e8f7 e2f3 g8f8 f3d1 f8g7 c2c1 f7e8 d1f3 f6f5 c1c2 a4b6 b1d2 d6b5 f3e2 b6a4 d2b1 g7f8 e2f3 f8e7 f3g2 a4b6 h4f3 b6d7 b1d2 d7f6 f3e5 b5d6 g2f3 e8a4 c2c1 f6e4 d2e4 f5e4

[zullil]

[D] 3r1qk1/6pp/1p1np3/2n4Q/p7/P3N1P1/1B2PP1P/3R2K1 w - -

Latest Stockfish---two lines that are transpositions:

Code: Select all

info depth 54 seldepth 82 multipv 1 score cp 126 nodes 724948014564 nps 39166199 hashfull 999 tbhits 131822246 time 18509532 pv h5g4 d8d7 f2f3 h7h6 g4b4 f8d8 g1f2 d6e4 f2e1 e4f6 d1d7 f6d7 e3c4 d8b8 b2d4 b6b5 d4c5 d7c5 b4c5 b5c4 c5c4 b8b1 e1f2 b1b3 c4c8 g8f7 c8c5 f7g8 c5d6 h6h5 d6c5 b3b2 c5e3 b2b3 e3d3 g8f7 d3d7 f7f6 d7d4 f6f7 d4f4 f7g6 f4c1 g6f7 c1c5 f7g8 h2h4 b3b7 c5d4 b7b3 d4d6 g8f7 d6c5 f7g8 c5e7 g8h7 e7d6 h7g8 f2f1 b3c4 d6d8 g8f7 d8d7 f7f8 d7d2 c4b3 d2d8 f8f7 d8c7 f7g8 c7c1

info depth 54 seldepth 82 multipv 2 score cp 126 nodes 724948014564 nps 39166199 hashfull 999 tbhits 131822246 time 18509532 pv f2f3 d8d7 h5g4 h7h6 g4b4 f8d8 g1f2 d6e4 f2e1 e4f6 d1d7 f6d7 e3c4 d8b8 b2d4 b6b5 d4c5 d7c5 b4c5 b5c4 c5c4 b8b1 e1f2 b1b3 c4c8 g8f7 c8c5 f7g8 c5d6 h6h5 d6c5 b3b2 c5e3 b2b3 e3d3 g8f7 d3d7 f7f6 d7d4 f6f7 d4f4 f7g6 f4c1 g6f7 c1c5 f7g8 h2h4 b3b7 c5d4 b7b3 d4d6 g8f7 d6c5 f7g8 c5e7 g8h7 e7d6 h7g8 f2f1 b3c4 d6d8 g8f7 d8d7 f7f8 d7d2 c4b3 d2d8 f8f7 d8c7 f7g8 c7c1 b3a2

[zullil]

[D] 4r1k1/p5b1/P2p1pp1/q1pP3p/2Pn1BbP/2NP2P1/3Q2BK/1R6 w - -

Latest Stockfish:

Code: Select all

info depth 48 seldepth 72 multipv 1 score cp 0 nodes 175776892866 nps 37385585 hashfull 999 tbhits 93107545 time 4701729 pv c3b5 a5b6 b5d6 b6b1 d6e8 d4f3 g2f3 g4f3 d2c1 b1d3 c1e1 f3e4 e8d6 e4f3 d6e8

info depth 48 seldepth 72 multipv 2 score cp 0 nodes 175776892866 nps 37385585 hashfull 999 tbhits 93107545 time 4701729 pv c3e4 a5a6 d2e3 g8h8 e3f2 g4f5 f4e3 f5e4 d3e4 e8c8 e3d4 c5d4 f2d4 c8c4 b1a1 c4d4 a1a6 h8g8 a6a7 f6f5 e4f5 g6f5 g2f3 d4d3 h2g2 g7e5 a7a6 d3d2 g2h3 d2d3 h3g2

[Jouni]

The big problem with STS is Houdini. It scores more solutions than SF (and faster), but in head-to-head games scores only 25%! WHY??

[Dann Corbit]

The big problem with STS is Houdini. It scores more solutions than SF (and faster), but in head-to-head games scores only 25%! WHY??

Because Houdini (And especially Houdini tactical) appears to have been tuned for tactics.

Most real chess positions are quiet positions.

I should mention that these positions are meant to be fairly quiet. However, by nature the positions all have some factor that leads to a clear advantage (in theory)