Search found 7146 matches

by Dann Corbit
Sat Jul 21, 2018 9:49 am
Forum: Computer Chess Club: General Topics
Topic: Something goes wrong with lc0 since yesterday?
Replies: 206
Views: 15287

Re: Something goes wrong with lc0 since yesterday?

I am not sure what to make of that. Some of the solutions you give are among the solutions of the position in the suite. What engine did you use? Stockfish, Komodo, or Houdini. I will not go to just put an engine solution even if I am not sure about the correct solution, as I don't trust current en...
by Dann Corbit
Sat Jul 21, 2018 8:55 am
Forum: Computer Chess Club: General Topics
Topic: SF groaned and moaned to find a mate in 10 on a sparse board.
Replies: 8
Views: 348

Re: SF groaned and moaned to find a mate in 10 on a sparse board.

Takes SF 64 plies to find this mate in 10. About four and a half minutes with 11 threads. Of course, due to SMP variance, I would expect other solution times to differ a lot. Searching: 2N5/p7/P7/8/1KPp1p1p/3p1Bpp/3P2rq/R5bk w - - 0 1 infinite: 0 time: 0 increment: 0 moves to go: 0 1 +0.00 00:00 93...
by Dann Corbit
Sat Jul 21, 2018 8:49 am
Forum: Computer Chess Club: General Topics
Topic: Something goes wrong with lc0 since yesterday?
Replies: 206
Views: 15287

Re: Something goes wrong with lc0 since yesterday?

I have a about 1/2 different moves chosen as the best move due to analysis (see the first move of the pv) compared to your choices (see field c3). I do not know if they are really better. As a suggestion, I would consider pasting the first move of these pv's onto your suggested bm list for those tha...
by Dann Corbit
Sat Jul 21, 2018 7:09 am
Forum: Computer Chess Club: General Topics
Topic: More problems that are hard on SF
Replies: 4
Views: 276

More problems that are hard on SF

1r2kb1r/2q2ppp/p2pp3/6PB/1N2bP1P/2P1B2Q/PK6/3R3R b - - 1r3bk1/5pp1/3p3p/p2NpP1Q/q2nP3/1p1PB2P/1Pr3PK/1R3R2 w - - 1r4k1/r1b3p1/1p1pppP1/qbPP4/n7/2P5/PP3P2/KQ3RRR w - - 1r6/4n2p/pn1kp3/1BpbR3/1Bp5/K4N2/3N3P/8 w - - 1rb2rk1/q2nbppp/4p3/p1p1P2Q/Ppp1NB1P/6P1/1P3PB1/R2R2K1 w - - 2B5/8/5n1p/5Kp1/6N1/2b1p3...
by Dann Corbit
Sat Jul 21, 2018 7:06 am
Forum: Computer Chess Club: General Topics
Topic: SF groaned and moaned to find a mate in 10 on a sparse board.
Replies: 8
Views: 348

Re: SF groaned and moaned to find a mate in 10 on a sparse board.

is that SF dev? mine (SF9 2 threads) is at depth 106 after 4 min and still stuck at 1. c5 I do have one custom tweak: If the number of possible moves is severely restricted I reduce null move pruning. This is the version that I am using: https://drive.google.com/open?id=1Rmmi0Ni2-zsmVuNYyfU_-qtQNfO...
by Dann Corbit
Sat Jul 21, 2018 6:18 am
Forum: Computer Chess Club: General Topics
Topic: SF groaned and moaned to find a mate in 10 on a sparse board.
Replies: 8
Views: 348

SF groaned and moaned to find a mate in 10 on a sparse board.

Takes SF 64 plies to find this mate in 10. About four and a half minutes with 11 threads. Of course, due to SMP variance, I would expect other solution times to differ a lot. Searching: 2N5/p7/P7/8/1KPp1p1p/3p1Bpp/3P2rq/R5bk w - - 0 1 infinite: 0 time: 0 increment: 0 moves to go: 0 1 +0.00 00:00 932...
by Dann Corbit
Fri Jul 20, 2018 10:25 pm
Forum: Computer Chess Club: General Topics
Topic: Interesting position, best move b4
Replies: 14
Views: 689

Re: Interesting position, best move b4

Searching: r4bk1/1p1r1p1p/p2ppBp1/2q5/b1P1P3/7R/PP2QPPP/1NR3K1 w - - 0 1 infinite: 0 time: 0 increment: 0 moves to go: 0 1 +1.96 00:00 1667 Nc3 2 +1.55 00:00 24663 b4 Qa7 3 +1.10 00:00 42730 Qd2 Bc6 Bd4 4 +1.01 00:00 59830 Qd2 Qb6 Nc3 Bc6 Rd1 5 +1.40 00:00 79160 Qd2 h5 b4 Qb6 Qg5 6 +1.52 00:00 1015...
by Dann Corbit
Fri Jul 20, 2018 9:17 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: StockFish : best move not found due to MultiPV ?
Replies: 44
Views: 1151

Re: StockFish : best move not found due to MultiPV ?

Straightforward analysis shows that Bd2 or Qg4 are pretty good, giving near equality. 3q1rk1/prppnp2/1p4p1/2b1P1N1/5P2/7P/PP5K/R1BQR3 w - - acd 50; acs 3600; bm Bd2; c0 "Qg4 Nf5 Bd2 is a transposition for Bd2 Nf5 Qg4."; ce -10; pm Bd2; pv Bd2 Nf5 Qg4 Bd4 Rad1 Qe7 Ne4 d6 exd6 cxd6 Ng3 Qd7 Nxf5 Qxf5 Q...
by Dann Corbit
Fri Jul 20, 2018 5:21 am
Forum: Computer Chess Club: General Topics
Topic: Mate in 9, what could be simpler
Replies: 5
Views: 325

Mate in 9, what could be simpler

Chest solves it quickly. Some engines have trouble.
r1bk3r/pp6/2nN4/3N2qn/2Kbppp1/P7/1PP1B1P1/R1BQ3R b - - acn 44675735; acs 142; bm Qxd5+; ce 32750; dm 9; pv Qxd5+ Kxd5 Nf6+ Kc4 Be6+ Kb5 a6+ Ka4 b5+ Nxb5 axb5+ Kxb5 Ra5+ Kxc6 Bd5+ Kd6 Ne8#;

Houdini 6 Tactical 1 solves it instantly.
by Dann Corbit
Fri Jul 20, 2018 12:43 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: StockFish : best move not found due to MultiPV ?
Replies: 44
Views: 1151

Re: StockFish : best move not found due to MultiPV ?

I think it is unclear what the best move is. It is not certain that b4 is the best move. It is not certain that b4 is not the best move.

I guess that with optimal play, this position is drawn, but it is a rather complex position, so it is hard to be sure.