Author: Eugene Nalimov
Date: 10:46:03 01/25/00
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Maybe problem was because Crafty doesn't generate checks in the Q-search? Eugene On January 25, 2000 at 12:57:33, Ernst A. Heinz wrote: >>>This can actually be made theoretically sound, so where is the >>>risk? >> >>If you lop off one ply, you overlook some tactics. I don't see any way >>around that at all... I stopped seeing some types of nonsense when I got >>rid of them, which made the search more stable. > >Sorry Bob, > >But normal futility pruning does not "lop off" one ply. It simply >lifts the "stand pat" cutoffs from horizon nodes to frontier nodes. > >That is exactly why you can make it theoretically sound with a wide >enough margin! My article on extended futility pruning in the ICCA >Journal 21(2) explained this in considerable detail. > >Maybe, you did some kind of razoring which indeed lops off one ply. > >=Ernst=
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