Search found 81 matches

by Tony P.
Tue Sep 19, 2017 5:20 pm
Forum: Computer Chess Club: General Topics
Topic: Opening analyses: SF / Komodo to 88% similar, not nice!!
Replies: 24
Views: 4902

Re: Opening analyses: SF / Komodo to 88% similar, not nice!!

right, reason is both top engines are fully clueless about the opening. for example, taking the Dutch. after 1.d4 f5, there is a single move that would give white advantage and winning chances, 2.d5! [d]rnbqkbnr/ppppp1pp/8/3P1p2/8/8/PPP1PPPP/RNBQKBNR b KQkq - 0 2 unfortunately, SF and Komodo are fu...
by Tony P.
Tue Sep 19, 2017 4:27 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish Chess 8 - en passant rule
Replies: 3
Views: 749

Re: Stockfish Chess 8 - en passant rule

There is code for e.p. move making , though (see the below code snippet from bitboards.cpp, lines 311-331), and the e.p. square is saved in the game state variable 'st', but for some reason, the code isn't working correctly yet. The zobrist.zEnPassant function is definitely not working yet. if (...
by Tony P.
Tue Sep 19, 2017 4:00 pm
Forum: Computer Chess Club: General Topics
Topic: Stockfish Chess 8 - en passant rule
Replies: 3
Views: 749

Re: Stockfish Chess 8 - en passant rule

I'm not a specialist in Stuckfish's source code , but a quick look at it reveals that its zobristh.cpp (the Zobrist hash implementation that's apparently different from Stockfish's) contains the following comment (line 146): //EnPassant and castling stuff add later Besides, the author (MaxCarlson) s...
by Tony P.
Mon Sep 18, 2017 4:39 pm
Forum: Computer Chess Club: General Topics
Topic: Andscacs - New version 0.92
Replies: 27
Views: 6658

Re: Andscacs - New version 0.92

There's Fire 6 to be released within the next few weeks, though. I wish all the TCEC participants to play chess at a level as high as possible :) Thanks for the upgrades! As a rule of thumb, in single rook endings where all pawns are on the same side , the position is a draw with best play. Yes, ex...
by Tony P.
Sun Sep 17, 2017 9:57 pm
Forum: Computer Chess Club: General Topics
Topic: Andscacs - New version 0.92
Replies: 27
Views: 6658

Re: Andscacs - New version 0.92

I'm not a chess expert... how can Black try to make any progress in the following KRPPvKRP (it starts at move 53)? The only pawn that can be passed is the h-pawn, and the fact that it's a rook pawn decreases the winning chances dramatically, as a rule of thumb. Yet, both engines evaluated it as abou...
by Tony P.
Sun Sep 17, 2017 7:36 pm
Forum: Computer Chess Club: General Topics
Topic: Andscacs - New version 0.92
Replies: 27
Views: 6658

Re: Andscacs - New version 0.92

It's a bit strange that Andscacs promoted to a rook in the following game (5'+3'' time control, resignation after -5 eval for 3 moves in a row), though it didn't influence the result at all. (Of course it's far not the only engine that's prone to underpromotion when the new piece is going to be take...
by Tony P.
Sun Sep 17, 2017 6:45 pm
Forum: Computer Chess Club: General Topics
Topic: Andscacs - New version 0.92
Replies: 27
Views: 6658

Re: Andscacs - New version 0.92

Congrats on the release and the strength improvement! One interesting change that I want to comment, but interested people will have to work the details for themselves, is that it now saves two moves to hash. This sounds excellent! Have you ever experimented with saving more than 2 moves per positio...
by Tony P.
Sun Sep 17, 2017 4:31 pm
Forum: Computer Chess Club: General Topics
Topic: 2017-2018 World Engines KO Champs V Who Will Win?
Replies: 14
Views: 3840

Re: 2017-2018 World Engines KO Champs V Who Will Win?

AA Ross, you want Thinksfish (or another Brainfish family engine) to win, don't you? ;) Otherwise why would you allow the engines to use their own books?
by Tony P.
Sun Sep 17, 2017 2:54 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Evaluation as a composite
Replies: 26
Views: 4811

Re: Evaluation as a composite

Alternative is a search factory that creates a search for a robot with an evaluation state using an evaluation strategy (composite) that updates its behavior depending on the position. I want two robots playing chess with different evaluation strategies and see which one plays best. So you need two...
by Tony P.
Sat Sep 16, 2017 10:07 pm
Forum: Computer Chess Club: General Topics
Topic: Gaviota, Wasp, The Baron, Pro Deo
Replies: 47
Views: 7107

Re: Gaviota, Wasp, The Baron, Pro Deo

BrendanJNorman wrote:Of course - but the difference is that Prodeo time and time again, has a habit of playing such piece sacs for rolling passed pawns.
That's a good point. Apparently, rolling passers have an unusually high weight in Prodeo's static eval :)