Search found 130 matches

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: 302

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: 1511

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: 2363

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 ...
by abulmo2
Fri May 10, 2019 10:31 pm
Forum: Computer Chess Club: General Topics
Topic: Opposite Color Bishop Endgames
Replies: 43
Views: 2363

Re: Opposite Color Bishop Endgames

One should remember that the design goal of engines is in general not to be good at chess, but just to have a high Elo. If worse programs score better in games, it is preferred to make them worse. I have some trouble to understand you, to be good at chess IS to have a high Elo . In the case of oppo...
by abulmo2
Fri May 10, 2019 5:59 am
Forum: Computer Chess Club: General Topics
Topic: Opposite Color Bishop Endgames
Replies: 43
Views: 2363

Re: Opposite Color Bishop Endgames

In Amoeba the opposite bishop code made my program weaker by a few Elo.
by abulmo2
Mon Apr 29, 2019 11:32 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Near-random movers
Replies: 21
Views: 3867

Re: Near-random movers

Once I counted when and how games terminate in case of
- a random mover:
Image
- a mate-in-1 mover:
Image
by abulmo2
Sat Apr 27, 2019 3:50 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Prefetch and Threading
Replies: 4
Views: 476

Re: Prefetch and Threading

The Prefetch() instruction can be used to speed up the read operation for hash table probes. My tests indicate a speed improvement for one CPU using Prefetch(), but increasing threads decrease the effectiveness of Prefetch(). What is happening? I do not know what is happening, but I do observe a si...
by abulmo2
Sat Apr 27, 2019 3:24 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: calculating seldepth
Replies: 2
Views: 297

Re: calculating seldepth

One aspect of the uci protocol I am not 100% sure about is seldepth. How do you calculate this? Is it the maximum depth qsearch has reached? In Amoeba, I compute it as the maximum depth reached in qsearch. Side question: should the depth we send in info string should be the iterative deepening dept...
by abulmo2
Fri Apr 19, 2019 4:52 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: No standard specification for Perft
Replies: 22
Views: 2935

Re: No standard specification for Perft

perft is a debugging tool, and the important thing is the number it returns, not the way you get it. If bulk counting makes debugging faster, I wonder what is wrong with it?