Search found 3455 matches

by lkaufman
Mon Feb 08, 2010 7:43 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Firebird 1.0 and 1.01: 180 games.
Replies: 67
Views: 11937

Re: Firebird 1.0 and 1.01: 180 games.

We (meaning both while working on Rybka and now on Komodo) have generally found that improved eval works pretty well against any opponent, and speedups work against unrelated opponents but to a lesser extent. However when speed is achieved at the expense of knowledge, it is likely that the faster ve...
by lkaufman
Mon Feb 08, 2010 7:32 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Firebird 1.0 and 1.01: 180 games.
Replies: 67
Views: 11937

Re: Firebird 1.0 and 1.01: 180 games.

Robbo (and I presume also Firebird) is much faster than Rybka 3 but with lower quality, so it will often see a ply deeper but with less positional knowledge and missing some tactical things as well. Therefore in a given amount of time the move choice is likely to be different. Apparently in this par...
by lkaufman
Mon Feb 08, 2010 4:16 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Firebird 1.0 and 1.01: 180 games.
Replies: 67
Views: 11937

Re: Firebird 1.0 and 1.01: 180 games.

I haven't even looked at Firebird as I thought it was too similar to Robbolito to be worth checking out. If you can, run the same moves thru Robbo to see if it acts like Firebird or like Rybka. If it is a lot different from Firebird on this game, I'll check out Firebird and let you know what I find ...
by lkaufman
Mon Feb 08, 2010 3:24 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Firebird 1.0 and 1.01: 180 games.
Replies: 67
Views: 11937

Re: Firebird 1.0 and 1.01: 180 games.

Do those three programs generally play the same move with the same score on one core at a set depth, or do they differ substantially and frequently at the same depth?
by lkaufman
Mon Feb 08, 2010 3:13 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Question to Larry Kaufman about Rybka
Replies: 55
Views: 8921

Re: Question to Larry Kaufman about Rybka

There is a bonus in the eval that I did for forks, but it's only something like half a pawn or so. Vas did tell me that the program picks up some tactics but not others, so I guess this is one that it does pick up. This at least explains some of the huge gap at one ply.
by lkaufman
Mon Feb 08, 2010 3:00 pm
Forum: Computer Chess Club: Tournaments and Matches
Topic: Firebird 1.0 and 1.01: 180 games.
Replies: 67
Views: 11937

Re: Firebird 1.0 and 1.01: 180 games.

I only use one core for these tests as I'm looking at so many positions and each core works on separate positions. There's no interest in testing MP as it's just a speedup and roughly similar among all programs. Regarding Firebird and Robbo, if Firebird is on one core is it sufficiently different fr...
by lkaufman
Mon Feb 08, 2010 3:32 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Question to Larry Kaufman about Rybka
Replies: 55
Views: 8921

Re: Question to Larry Kaufman about Rybka

[quote So does anyone have a clue as to why Robbo is so much stronger than standard engines at 1 or 2 ply but not at 5 ply? "Perhaps because is not at 1 or 2 ply :-) this is only for the other engine but not for Robbo. hint: how do you take in account extensions ?....ask Don for the answer ;-)[/quo...
by lkaufman
Mon Feb 08, 2010 2:33 am
Forum: Computer Chess Club: Tournaments and Matches
Topic: Firebird 1.0 and 1.01: 180 games.
Replies: 67
Views: 11937

Re: Firebird 1.0 and 1.01: 180 games.

Comparing engine moves to high-class human moves is not without merit, though hardly original. However instead of using one game I regularly use thousands, a total of over 152,000 positions from such games. On this basis Robbolito (several versions) scored the equivalent of about 50 Elo better than ...
by lkaufman
Sun Feb 07, 2010 11:00 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Question to Larry Kaufman about Rybka
Replies: 55
Views: 8921

Re: Question to Larry Kaufman about Rybka

Maybe your inclusive qsearch is not good enough. If Komodo with inclusive qsearch is losing against Robbolito at 1 plies or 2 plies then you should look at the games to understand why does it lose. Assuming that it is not because of some better evaluation then it has to be because of better qsearch...
by lkaufman
Fri Feb 05, 2010 11:59 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Question to Larry Kaufman about Rybka
Replies: 55
Views: 8921

Re: Question to Larry Kaufman about Rybka

It has a better tuned eval function and superior qsearch. A better eval would show up more at higher depths, not at one or two ply where the results are dominated by tactics. A superior qsearch is a part of the answer, but only a small part, as our tests indicate that even a very slow, inclusive qs...