Search found 16845 matches

by bob
Thu May 31, 2007 1:39 am
Forum: Computer Chess Club: General Topics
Topic: Participants WCCC 2007
Replies: 108
Views: 49959

Re: Participants WCCC 2007

OK... this makes a little more sense now. I was contacted a while back and asked about it. My response was along the lines of this: (a) I'm not going to participate this year as things were thrown together too quickly and there was not enough time to make the kind of preparations we would normally ...
by bob
Thu May 31, 2007 1:38 am
Forum: Computer Chess Club: General Topics
Topic: Participants WCCC 2007
Replies: 108
Views: 49959

Re: Participants WCCC 2007

OK... this makes a little more sense now. I was contacted a while back and asked about it. My response was along the lines of this: (a) I'm not going to participate this year as things were thrown together too quickly and there was not enough time to make the kind of preparations we would normally ...
by bob
Thu May 31, 2007 1:34 am
Forum: Computer Chess Club: General Topics
Topic: Chris's Crafty Computer Chess Campaign
Replies: 8
Views: 3212

Re: Bob Bob Bob ....Crafty can play at WCCC....

Or the CCCCC for short......is devoted to bringing you the best at this years WCCC. Never let it be said that a former world champion chess engine should not participate because a mere ocean is in the way. So much so that the donation fund has reached the 25 euro entry fee and not before time. June...
by bob
Tue May 29, 2007 9:23 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Speedup with bitboards on 64-bit CPUs
Replies: 49
Views: 36825

Re: Speedup with bitboards on 64-bit CPUs

Hello, That changes the math a lot. The q-search almost has to be > 50% of the total nodes searched unless you look at simple endings like fine 70. Every branch reaches a depth=0 point where it transitions to the q-search. Exponential trees mean this is a big percentage of total nodes searched sinc...
by bob
Tue May 29, 2007 9:15 pm
Forum: Computer Chess Club: General Topics
Topic: Participants WCCC 2007
Replies: 108
Views: 49959

Re: Participants WCCC 2007

http://www.grappa.univ-lille3.fr/icga/tournament.php?id=173&lang=6 Now we are already 10. Another big iron - puhh GridChess by Kai Himstedt and Ulf Lorenz Thomas Gaksch Toga parts Fabien Letouzey Fruit parts Robert Hyatt Crafty parts No idea whether the Sleep In still exist, but no need to take an ...
by bob
Tue May 29, 2007 3:18 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Speedup with bitboards on 64-bit CPUs
Replies: 49
Views: 36825

Re: Speedup with bitboards on 64-bit CPUs

Hello, If I understand it correctly, Crafty generates and tries captures before noncaptures in the main search, so if those moves cause cutoffs, the normal moves won't have to be generated at all. QS isn't the only place for savings. The arithmetic seems like this:- for every fail high node, there ...
by bob
Tue May 29, 2007 3:15 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Speedup with bitboards on 64-bit CPUs
Replies: 49
Views: 36825

Re: Speedup with bitboards on 64-bit CPUs

Hello, But once again, in the hope that one day it will sink in, .... Vasik Rajlich has become sort of Jesus Christ in computer chess, Osipov has become sort of Son of Jesus Christ in computer chess and Sergei Markoff is very like St. Peter...If after the appearance of sort of Messiah preaching the...
by bob
Tue May 29, 2007 3:12 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: First fail high drops in endgame
Replies: 20
Views: 10633

Re: First fail high drops in endgame

Did you ever measure this quantity before (with different result)? It seems normal to me that it is more difficult to find cut-moves in an end-game, as the information that distinguishes the winning from the losing moves is much more distant. In the middle game it is often decided by what is on the...
by bob
Tue May 29, 2007 3:10 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: First fail high drops in endgame
Replies: 20
Views: 10633

Re: First fail high drops in endgame

Hi all, I think I broke something in my engine, but I'm not sure what. Maybe someone has a clue. When I go towards the endgame, the percentage first fail high drops to below 80% ( normally above 90%) I'm not sure how to test/ where to look. I switched off bitbases (thought they were corrupt), switc...
by bob
Sun May 27, 2007 9:49 pm
Forum: Computer Chess Club: General Topics
Topic: Participants WCCC 2007
Replies: 108
Views: 49959

Re: Participants WCCC 2007

http://www.grappa.univ-lille3.fr/icga/tournament.php?id=173&lang=6 Now we are already 10. Another big iron - puhh GridChess by Kai Himstedt and Ulf Lorenz Thomas Gaksch Toga parts Fabien Letouzey Fruit parts Robert Hyatt Crafty parts No idea whether the Sleep In still exist, but no need to take an ...