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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...

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.

Crafty likes Rf6 instantly and the score climbs each iteration. Looks completely fatal for black.

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...

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...

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...

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...

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...

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...

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...