Search found 3761 matches

by lkaufman
Thu Dec 01, 2011 2:44 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Lazy eval
Replies: 126
Views: 21088

Re: Lazy eval - test results

But with margins of around half a pawn, we only get about a 2% speedup (roughly 4% more nps but a 2% increase in nodes) and our quality clearly suffers too much for that. Can you check what speedup you get, and with what margins? This is clearly impossible. You must have an error in implementation....
by lkaufman
Thu Dec 01, 2011 1:55 am
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Lazy eval
Replies: 126
Views: 21088

Re: Lazy eval - test results

I compared depths, nodes and times. I can post the complete logs if you want to see. LE should not affect the QUALITY one iota, if it is done correctly. It only affects the speed. If you use too large a margin, it is ineffective as nothing will take the lazy exit. If you use too small a margin, you...
by lkaufman
Wed Nov 30, 2011 10:48 pm
Forum: Computer Chess Club: General Topics
Topic: Komodo 4 on long time control
Replies: 154
Views: 39212

Re: Komodo 4 on long time control

I think that Komodo 4 on tournament time control is going to overtake Houdini. That is my opinion looking at the different rating related at different time controls (http://www.amateurschach.de/) Regards It'll be close Lonnie I don't think close will cut it. If Komodo 4 is only close to Houdini 2. ...
by lkaufman
Wed Nov 30, 2011 9:20 pm
Forum: Computer Chess Club: General Topics
Topic: Deep Rybka 1- GM Vásquez 1
Replies: 13
Views: 2146

Re: Deep Rybka 1- GM Vásquez 1

What was the hardware? Was it MP or SP Rybka, and was it 64 bit or 32 bit?
by lkaufman
Tue Nov 29, 2011 4:18 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: LMR questions
Replies: 34
Views: 4107

Re: LMR questions

I reduce moves based on the score they get after sorting the moves. In practice, that means I do not reduce hash moves, killers, winning captures, counter moves and queen promotions. I reduce everything else, but not if I'm in check. If a reduced move fails high, it is re-searched without reduction...
by lkaufman
Tue Nov 29, 2011 5:58 am
Forum: Computer Chess Club: General Topics
Topic: Rybka Vs Humans: clarification
Replies: 31
Views: 4599

Re: Rybka Vs Humans: clarification

Setting contempt only helps once you leave book. I'm talking about the book dumping the engine in a two-results position (White win or draw) when it is Black. 3-move book, contempt +1. Kai Okay, but then you are giving a handicap, the same one we gave Ehlvest in one of the Rybka matches. There is a...
by lkaufman
Tue Nov 29, 2011 4:51 am
Forum: Computer Chess Club: General Topics
Topic: Rybka Vs Humans: clarification
Replies: 31
Views: 4599

Re: Rybka Vs Humans: clarification

Setting contempt only helps once you leave book. I'm talking about the book dumping the engine in a two-results position (White win or draw) when it is Black.
by lkaufman
Tue Nov 29, 2011 2:32 am
Forum: Computer Chess Club: General Topics
Topic: Rybka Vs Humans: clarification
Replies: 31
Views: 4599

Re: Rybka Vs Humans: clarification

I'm interested in whether Rybka would clean sweep vs. have a draw. Unfortunately I don't think this will depend much on the players or on Rybka. I presume that Rybka will just use some standard opening book and choose openings at random. So it may happen that in one game (or even two) with Black it...
by lkaufman
Tue Nov 29, 2011 1:49 am
Forum: Computer Chess Club: General Topics
Topic: Rybka Vs Humans: clarification
Replies: 31
Views: 4599

Re: Rybka Vs Humans: clarification

I've got no problem with that, but who would pay any money to get the participation of a program that will play for free, or to watch such a mismatch. I'm just curious as to HOW it would raise any money?
by lkaufman
Tue Nov 29, 2011 12:30 am
Forum: Computer Chess Club: General Topics
Topic: Rybka Vs Humans: clarification
Replies: 31
Views: 4599

Re: Rybka Vs Humans: clarification

No joke, Larry. Simply a way to make attractive a chess tournament with something that always catch the interest of the public and the media. For average people, a game between even me and Rybka is more interesting than a technical game between two GM. You see, NOT everything must accomplish some k...