Author: Vincent Diepeveen
Date: 03:26:04 12/08/00
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On December 07, 2000 at 14:11:43, Robert Hyatt wrote: >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... The positional effect of nullmove and futility can be best described as the effect on the landscape of a handgun and an atomic bomb.
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