Author: Ernst A. Heinz
Date: 09:57:33 01/25/00
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>>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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