Author: Robert Hyatt
Date: 11:11:43 12/07/00
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On December 07, 2000 at 13:56:31, Bert van den Akker wrote: >In a previous question about Futility pruning Vincent Diepeveen mentioned: > >>Futility pruning is very dubious. It sure speeds you up, but it's >>dubious and tends to give you slight positional >>differences that make a program play positional >>a lot weaker. > >Can sombody explain me why Futility pruning tends to give slight positional >differences? > >BvdA Same thing happens with null move and any other sort of pruning that discards a branch here and there. If you discard a branch that somehow contributes to the PV score, then the PV score will change. Anything that perturbs the shape/ size of the tree will potentially change the PV score...
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