Search found 772 matches

by PK
Thu Aug 01, 2019 6:14 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Poor performance of Stockfish 10 against Igel 1.8.3 at (shallow) fixed depth=10
Replies: 7
Views: 825

Re: Poor performance of Stockfish 10 against Igel 1.8.3 at (shallow) fixed depth=10

There is a circular dependency that goes as follows: Stockfish prunes and reduces insane amounts of moves. It needs depth to compensate for that. Insane prunings and reductions are needed to reach that depth.
by PK
Mon Jul 29, 2019 4:56 am
Forum: Computer Chess Club: General Topics
Topic: What was the last good Rodent?
Replies: 9
Views: 788

Re: What was the last good Rodent?

Link is to version 0.172, as for 0.238 I'm afraid I will have to recomplile it. BTW, I am slowly working on Rodent IV, and it's tuning system is already taking shape. There will be one interesting addition - "stylistic interpolation" between different sets of piece/square tables. Basically, you pick...
by PK
Mon Jul 29, 2019 3:25 am
Forum: Computer Chess Club: General Topics
Topic: What was the last good Rodent?
Replies: 9
Views: 788

Re: What was the last good Rodent?

I am aware that something went wrong with Rodent's style, probably because of automated tuning, and working to fix it. Noticed the problem watching CCRL game, a few elo weren't worth the mess it has been creating. However the good news is that if you set a personality, it uses mostly old default val...
by PK
Sun Jul 07, 2019 9:31 am
Forum: Computer Chess Club: General Topics
Topic: UCI_Elo
Replies: 49
Views: 3447

Re: UCI_Elo

Granting that the wishes of UCI designers is for the UCI_Elo to be equivalent to FIDE Elo... There's still a problem with time control. Node budget approach works for a single time control, so in order to approximate FIDE rating you would need at least to tune for two time controls (let's say 2+1 a...
by PK
Sun Jul 07, 2019 7:36 am
Forum: Computer Chess Club: General Topics
Topic: UCI_Elo
Replies: 49
Views: 3447

Re: UCI_Elo

This thread shows perfectly why UCI_Elo ratings for different engines will never converge. There are several methods described already: - strict node budget - limiting nodes per second - limiting nodes per second + random noise in eval function Furthermore, a couple of other methods can be added: - ...
by PK
Fri Jul 05, 2019 6:50 am
Forum: Computer Chess Club: General Topics
Topic: Wasp 3.60 time forfeit on UCI_LimitStrength
Replies: 1
Views: 524

Re: Wasp 3.60 time forfeit on UCI_LimitStrength

I remember having similar problem with Rodent. It turned out that once nodes per second are limited, one has to check for timeout a bit more often (assuming that checking for timeout is done at constant node intervals).
by PK
Thu Jul 04, 2019 8:11 am
Forum: Computer Chess Club: General Topics
Topic: Fireworks for the Fourth
Replies: 17
Views: 1534

Re: Fireworks for the Fourth

Whit kind of magic is this? You have bested OpenTal.
by PK
Mon Jul 01, 2019 10:07 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Exchange
Replies: 15
Views: 1540

Re: Exchange

My Texel tuning also consistently gets significantly lower value for a knight in the endgame and slightly lower for a bishop. Rook and queen behave as expected. The observation is consistent across two engines, with different k factor but the same set of positions. I guess it might be fixed by incre...
by PK
Sun Jun 30, 2019 5:46 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: The Cripple And The Cucumber
Replies: 9
Views: 974

Re: The Cripple And The Cucumber

Thank you, Graham. I expected more improvement from my recent changes, but it's good to see even a little!
by PK
Tue Jun 25, 2019 8:15 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: How many elo gain a good Opening book have on Stockfish?
Replies: 5
Views: 1160

Re: How many elo gain a good Opening book have on Stockfish?

There is an awful lot of difference between opening books. I participated once in Sedat's tournament, and Rodent's book has been badly beaten. But the real question is, what book is used against Allie - general one, or anti-Allie.