Author: Ernst A. Heinz
Date: 13:09:32 12/07/00
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>If you use _any_ kind of pruning, you can perturb the root score. Thanks >to the transposition table that grafts parts of the tree into odd places. >There is no way to anticipate which branches are useless _here_ but the >hash results might improve the results over _there_. And as a result, you >can get different root move scores no matter how "sound" the pruning. But the effects you describe, Bob, are rather due to the hash-table usage than to the pruning. They might also occur if you just change your move ordering. Anyway, in the case of futility pruning at frontier nodes with a remaining depth of 1 ply they hardly matter (if at all) because it simply lifts inevitable "stand-pat" beta cutoffs at horizon nodes up one level in the search. =Ernst=
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