Author: Uri Blass
Date: 22:01:16 01/21/04
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On January 21, 2004 at 18:25:54, Tord Romstad wrote: >On January 21, 2004 at 14:59:23, Robert Hyatt wrote: > >>On January 21, 2004 at 12:45:59, Tord Romstad wrote: >> >>>On January 21, 2004 at 05:02:37, Robert Allgeuer wrote: >>> >>>>Do I conclude correctly that futilty pruning is off? Is there a specific reason >>>>for that? >>> >>>Possibly that it simply doesn't work very well? The idea has always looked >>>dubious to me, and my own experiments confirm this. There is a speedup, but >>>it is not worth the risks. >>> >>>As always, the results may vary from engine to engine, but I suppose Bob has >>>found that it doesn't work for him either. >>> >>>Tord >> >> >>Correct. I didn't like it myself after lots of testing. It looks good on >>test sets, but you don't win games by doing well on test sets. > >That's precisely what I found, too. > >In general I am very sceptical about pruning schemes which prune moves before >they >are made. At that time, we simply don't know enough about the moves to be able >to prune safely. I do not understand it. Suppose that the opponent has a big material advantage so you think the only hope to get the score above alpha is by a capture or checkmate. Suppose that captures and checks did not return score above alpha. Do you think that it is a bad idea to prune other moves before you make them(espacially for program that are using fail hard like Crafty and not fail soft)? Uri
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