Search found 137 matches

by abulmo2
Fri Oct 04, 2019 10:46 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish mates Allie in 34 moves / TCEC
Replies: 20
Views: 2009

Re: Stockfish mates Allie in 34 moves / TCEC

You really think 16. ... b4 is losing? I don't see it! I said probably losing, I am not sure of anything. From the analysis posted above, the line is : 16. ... b4 17. axb4 cxb4 18. e5 dxe5 19. fxe5 Re8 20. Kd1 Bxd5 21.exf6 hxg5 22.hxg5 g6 23.fxe7 Rxe7 24.Ra6 Rc7 25.Qd3 Bc4 26.Qd6 Qxd6 27.Rxd6 Re8 2...
by abulmo2
Thu Oct 03, 2019 9:53 am
Forum: Computer Chess Club: General Topics
Topic: Stockfish mates Allie in 34 moves / TCEC
Replies: 20
Views: 2009

Re: Stockfish mates Allie in 34 moves / TCEC

Here is a postmortem reverse analysis done with (now old) stockfish 10 at depth 30 with 4 threads. The following moves by Allie look wrong: 16. .. b4 is probably losing 21. .. Nh5 is certainly losing 23. .. Qd7 is definitely losing Note also that Allie played badly the endgame, the mate should have ...
by abulmo2
Tue Sep 17, 2019 8:20 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Level 11 Perft statistics
Replies: 5
Views: 713

Re: Level 11 Perft statistics

What does Disc and Dbl mean?
by abulmo2
Thu Sep 05, 2019 2:26 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Using profiler on linux
Replies: 8
Views: 943

Re: Using profiler on linux

As your link show, gprof is a possible solution.
Another one is using perf: https://perf.wiki.kernel.org/index.php/Main_Page
by abulmo2
Thu Jul 18, 2019 12:03 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Understanding first rank attack state generation
Replies: 15
Views: 1325

Re: Understanding first rank attack state generation

I I understood most part of the code except this lines (appearing twice in generate_rank_attack): if ((o & b) == b) break; What is the use of the above if loop conditional? Many Thanks, Kalyan The purpose of this code is to generate an attack mask containing empty squares and the first occupied squ...
by abulmo2
Mon Jul 01, 2019 9:41 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Exchange
Replies: 15
Views: 2228

Re: Exchange

This is scary. Does others engines exhibit such lower EG values ? For Amoeba, pawn, rook, bishop pair and material imbalance have significantly stronger values during the endgame phase. knight and bishop keep about the same value and the queen is slightly stronger. However, Amoeba's evaluation func...
by abulmo2
Sun Jun 02, 2019 2:48 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: CCRL 40/40, 40/4 and FRC lists updated (1st June 2019)
Replies: 3
Views: 1042

Re: CCRL 40/40, 40/4 and FRC lists updated (1st June 2019)

The latest CCRL Rating Lists and Statistics are available for viewing from the following links : http://ccrl.chessdom.com/ccrl/404 (40/4) 40/4 testing since the last update report has included (thanks to Gabor and Tirsa): Amoeba 3.0 64-bit Thank you for running all those games with Amoeba. I hope t...
by abulmo2
Fri May 24, 2019 1:24 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: QSearch perft
Replies: 24
Views: 4005

Re: QSearch perft

These are the counts I get per move at depth 4, maybe it helps. g2h3: 381 d5e6: 436 e5g6: 495 e5d7: 642 e5f7: 475 e2a6: 343 f3h3: 397 f3f6: 521 Maybe somebody else can verify these numbers. I think the difference is due to the fact that you don't generate check-evasions, because check-evasions will...
by abulmo2
Sat May 11, 2019 10:12 am
Forum: Computer Chess Club: General Topics
Topic: Opposite Color Bishop Endgames
Replies: 43
Views: 4145

Re: Opposite Color Bishop Endgames

The following 8-piece endgame just arose in a Raubfisch X40a3-Cfish match: [d]4b3/8/6k1/6p1/p6p/K3B1P1/8/8 w 01 Virtually all humans immediately see that this is a draw. A simple variation of the above position: [d]4b3/8/2p3k1/2K3p1/7p/4B1P1/8/8 w - - 0 1 Here it is a black win. I just move a pawn ...