Search found 16762 matches

by bob
Tue Apr 10, 2007 6:24 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Enhanced Transposition Cutoff
Replies: 6
Views: 8036

Re: Enhanced Transposition Cutoff

Hi. I've just added ETC to my engine. However my gains are very minor; about 1% less nodes and a fraction faster on a set of mate-in-4 problems. So naturally I would like to know what kind of improvement other authors are seeing by implementing ETC. Also which free source engines have implemented E...
by bob
Mon Apr 09, 2007 8:38 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: LMR in micro-Max
Replies: 17
Views: 34181

Re: LMR in micro-Max

I suggest you re-run your test several times. You might be amazed at the built-in randomness caused by simply using time as the stopping criterion.
by bob
Mon Apr 09, 2007 7:12 pm
Forum: Computer Chess Club: General Topics
Topic: Test Position
Replies: 12
Views: 10246

Re: Test Position

Crafty likes Rf6 instantly and the score climbs each iteration. Looks completely fatal for black.
by bob
Thu Apr 05, 2007 7:20 pm
Forum: Computer Chess Club: General Topics
Topic: WCCC 2007
Replies: 24
Views: 24880

Re: WCCC 2007

The ICGA is in the final stage of negotiation for organizing the WCCC 2007, the 12th Computer Olympiad, and an accompanying scientific workshop . The events would take place in Amsterdam, The Netherlands at the end of June / beginning of July 2007. Further details will be announced as soon as possi...
by bob
Wed Apr 04, 2007 7:44 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Fantacising about a testing cluster!
Replies: 21
Views: 23145

Re: Fantacising about a testing cluster!

I like to test at 60/60 time controls. 60 minutes on the clock, 60 seconds per move added. That turns into 4-6 hours per game. or 6-8 games per day. 30 days isn't enough games to determine if version X is better than version X-1 at that speed. It takes more than a hundred games or two with two oppo...
by bob
Tue Apr 03, 2007 9:24 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: SEE on non-capture moves in main search
Replies: 62
Views: 68357

Re: SEE on non-capture moves in main search

Even if you take an infinite number of positions it would still be meaningless if you did not measure tactical strength. Because you would select the move ordering systematically to reduce more moves by LMR, by putting poor, but non-reducible moves (like bad captures) in front, just to put interest...
by bob
Tue Apr 03, 2007 9:23 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: SEE on non-capture moves in main search
Replies: 62
Views: 68357

Re: SEE on non-capture moves in main search

Don't underestimate my abilities here :) There is no need to act stupid even if it is possible... Captures are a very special and easy to detect cases. What you say is in general applicable to every move ordering test, LMR on or off. There are other pruning methods. If you look above you will see h...
by bob
Tue Apr 03, 2007 7:28 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Fantacising about a testing cluster!
Replies: 21
Views: 23145

Re: Fantacising about a testing cluster!

I like to test at 60/60 time controls. 60 minutes on the clock, 60 seconds per move added. That turns into 4-6 hours per game. or 6-8 games per day. 30 days isn't enough games to determine if version X is better than version X-1 at that speed. It takes more than a hundred games or two with two oppo...
by bob
Mon Apr 02, 2007 8:53 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: Fantacising about a testing cluster!
Replies: 21
Views: 23145

Re: Fantacising about a testing cluster!

I like to test at 60/60 time controls. 60 minutes on the clock, 60 seconds per move added. That turns into 4-6 hours per game. or 6-8 games per day. 30 days isn't enough games to determine if version X is better than version X-1 at that speed. It takes more than a hundred games or two with two oppon...
by bob
Mon Apr 02, 2007 6:46 pm
Forum: Computer Chess Club: Programming and Technical Discussions
Topic: SEE on non-capture moves in main search
Replies: 62
Views: 68357

Re: SEE on non-capture moves in main search

I don't get why you turn LMR off during move ordering tests. Why not turn off killers or hash tables? They are all both dependent of the move ordering and will also change the move ordering. If there is a combined effect from LMR and different move ordering methods you want to catch that right? /Pe...