Search found 17729 matches

by hgm
Tue Jul 02, 2019 8:47 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: 64-bit Windows compile wanted
Replies: 6
Views: 577

64-bit Windows compile wanted

I am asking this on behalf of new user Albukhari, who is stiill waiting for his registration here to be activated:

Can anyone post a 64-bit Windows executable of https://github.com/ianfab/Shatranj-Stockfish ?
by hgm
Mon Jul 01, 2019 3:38 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: tuning for the uninformed
Replies: 64
Views: 13417

Re: tuning for the uninformed

But not if you actually want to be able to win in a +10 position...
by hgm
Mon Jul 01, 2019 3:36 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Exchange
Replies: 15
Views: 605

Re: Exchange

No tuning method can tune eval terms that are missing.

It also depends what you tune the eval to represent. I would not tune it purely for expected score, but in case of a won position, also for duration of the win. Trying to teach it that +14 is just as good as +10 is very detrimental.
by hgm
Mon Jul 01, 2019 12:33 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Exchange
Replies: 15
Views: 605

Re: Exchange

I agree with your analysis but : 1°) my recent optimization (texel tuning on quiet.edp) tries (even starting from higher EG values) disagree and converge to lower EG values (without the additional term of course), and I don't get why yet. 2°) the added term won't affect opening because the scaling ...
by hgm
Mon Jul 01, 2019 8:19 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Exchange
Replies: 15
Views: 605

Re: Exchange

Lower end-game piece values make little sense to me. Intuitively I would highly prefer a position with B+N vs B and several (equal) Pawns over one where there were in addition a Queen, a Rook and another Knight on each side. One could argue that being a Knight ahead early should enable you to gain m...
by hgm
Mon Jul 01, 2019 7:36 am
Forum: Computer Chess Club: General Topics
Topic: strange behaviour of PyturoChamp on WinBoard AA beta /CuteChess
Replies: 7
Views: 369

Re: strange behaviour of PyturoChamp on WinBoard AA beta /CuteChess

This doesn't appear to show any of the problems encountered by Norbert. In fact, now that I look more carefully to the result message, it appears that WinBoard rules a win for PyTuroChamp (black): the stated result is 0-1. That means e7e6 was received from Fairy-Max. Which makes it indeed an illegal...
by hgm
Mon Jul 01, 2019 6:05 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Exchange
Replies: 15
Views: 605

Re: Exchange

But this suggests the values are wrong, and that by adding this extra term you correct that. The min(matA, matB) in your term is effectively the game phase, as when matA and matB are not approximately equal the game is decided anyway, and extra eval terms, good or bad, would have no effect on that. ...
by hgm
Mon Jul 01, 2019 5:51 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Exchange
Replies: 15
Views: 605

Re: Exchange

Well, if being a Knight ahead is +300 in opening score, and +400 in endgame score, and the game phase is defined as minors+3*Rooks+6*Queens (running from 0=Pawn ending to 32=opening), if you were a Knight ahead with all other material on the board you would have +300*31/32+400*1/32 = +303. By tradin...
by hgm
Mon Jul 01, 2019 5:28 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Exchange
Replies: 15
Views: 605

Re: Exchange

This tendency to trade when ahead would come automatically if the end-game piece values were larger than the opening values. Then advancing the game phase would increase the value of a given material advantage. Like you already hint at, this trade-encouragement backfires if the advantage is not yet ...
by hgm
Sun Jun 30, 2019 4:47 pm
Forum: Computer Chess Club: General Topics
Topic: strange behaviour of PyturoChamp on WinBoard AA beta /CuteChess
Replies: 7
Views: 369

Re: strange behaviour of PyturoChamp on WinBoard AA beta /CuteChess

The winboard.debug file should be in the same folder as the winboard.exe.

Note that it is WinBoard that judged e7e6 to be illegal. This is what makes it so strange.