Search found 3101 matches

by Eelco de Groot
Tue Dec 10, 2019 3:21 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: An AMD compiling hunch
Replies: 12
Views: 697

Re: An AMD compiling hunch

If you compile with -modern instead of -BMI2 is that not the simplest, for Stockfish I mean? You avoid the bad PEXT/PDEP instructions that Gian-Carlo mentions in another post here, they are implemented (in ZEN I suppose, not all recent AMD processors?) but Stockfish has better solution doing it with...
by Eelco de Groot
Mon Dec 09, 2019 8:06 pm
Forum: Computer Chess Club: General Topics
Topic: nice tactical position
Replies: 5
Views: 502

Re: nice tactical position

Nice test for the humans is why Black can not take the Knight with the pawn on move 5, because 6.Qxg6 (or 27. Qxg6) does not seem to work. [Event "?"] [Site "?"] [Date "2019.12.9"] [Time "8:38:56"] [Round "?"] [White "Eelco de Groot"] [Black "Chess Tiger 2007.1 engine - Gambit style"] [Result "*"] [...
by Eelco de Groot
Sun Nov 17, 2019 2:01 pm
Forum: Computer Chess Club: General Topics
Topic: Testposition
Replies: 12
Views: 1246

Re: Testposition

mentioned by vishyvishy from Lc0 forum: https://groups.google.com/forum/#!topic/lczero/vt-O1_KamtI [d]1rb1qrk1/2b2pp1/p3pBn1/3pP1Pp/1ppP4/2P1QN2/PP3P1P/R2BR1K1 w - - 0 21 bm Nh4 21. .. Kh7!? (21...Nxh4?! +- (21. .. bxc3?! 22. bxc3 Nxh4 23. Qh3 Nf5 24. Qxh5 Rb2 25. Bg4 +-)) 22. Bc2 Bd7 !?? im not su...
by Eelco de Groot
Thu Nov 14, 2019 2:48 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish search stops here after 99 plies, why?
Replies: 10
Views: 1067

Re: Stockfish search stops here after 99 plies, why?

Assumimg that Stockfish really sees the 50 move rule here, it should but I can't remember Stockfish actually doing this myself, but then it will find that every value other than a draw is wrong. Because even with only three pieces moving there are a lot of transpositions all with the same value beca...
by Eelco de Groot
Thu Nov 14, 2019 9:48 am
Forum: Computer Chess Club: General Topics
Topic: Testposition
Replies: 12
Views: 1246

Re: Testposition

23. Qxh5 is totally winning by the way, as most people already will have seen by now. But Stockfish practically only considers the reply 23. Bxh5 which is not winning 1rb1qrk1/2b2pp1/p3pB2/3pPnPp/1ppP4/2P4Q/PP3P1P/R2BR1K1 w - - (best 15 moves here) 1rb1qrk1/2b2pp1/p3pB2/3pPnPp/1ppP4/2P4Q/PP3P1P/R2BR...
by Eelco de Groot
Thu Nov 14, 2019 6:18 am
Forum: Computer Chess Club: General Topics
Topic: Testposition
Replies: 12
Views: 1246

Re: Testposition

After ten hours (one core) latest Stockfish development version is still playing something else, 21. h3 At no point 21. Nh4 is chosen or considered seriously in normal operation as far as I could see, in the beginning. 1rb1qrk1/2b2pp1/p3pBn1/3pP1Pp/1ppP4/2P1QN2/PP3P1P/R2BR1K1 w - - Engine: Sf2019111...
by Eelco de Groot
Sun Nov 03, 2019 3:01 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: "stat score bonus" in stockfish
Replies: 6
Views: 1030

Re: "stat score bonus" in stockfish

I think there is an aging factor for the stat scores, so that they do get refreshed. But more importantly, the bonus is only added in nodes with no ttHit. This means probably that the node is often near the leaves, and a new node. Once the hash probe finds a search result, you have both a search res...
by Eelco de Groot
Sat Nov 02, 2019 2:06 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: some questions about singular search in Stockfish
Replies: 3
Views: 910

Re: some questions about singular search in Stockfish

As far as I can see, those are good questions. Using the alternative Key I think is no longer needed but still there because in the past the result of the search with excluded move was stored, but it gave a little Elo not to do that anymore. I can't really see why it was not smplified away after tha...
by Eelco de Groot
Fri Nov 01, 2019 1:26 pm
Forum: Computer Chess Club: General Topics
Topic: For under the Christmas tree?
Replies: 2
Views: 680

For under the Christmas tree?

E-mail from New in Chess about Larry Kaufman's new book, I just saw this in my mailbox, maybe interesting idea for the people looking for a gift to themselves or for others for the holiday season. You indirectly support work on Komodo, and Monte Carlo search I think too. https://gallery.mailchimp.co...