Author: Robert Hyatt
Date: 06:33:26 01/23/98
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On January 23, 1998 at 02:38:52, Bruce Moreland wrote: > >On January 23, 1998 at 00:18:18, Don Dailey wrote: > >>2. You mentioned extension based on the target score (alpha/beta.) We >>used to do this and eventually threw these out long ago because they >>do cause problems whether you use mtd or not. So far our program >>has met your requirements for MTD candidacy! > >Isn't null-move forward pruning an example of this nasty alpha-based >stuff? > >bruce yes... but we never have problems with a null-move search failing high in one case and low in another, only because alpha/beta changes. :) :) Bob I have *enough* trouble with a position that fails high, the hash remembers that it fails high, and then later I look this position up and get a fail high because of the hash table. Then I relax beta, re-search, now the hash entry can't make me fail high, the search can not see deeply enough to figure out why this failed high, so I fail low. <puke>
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