Author: Robert Hyatt
Date: 08:23:27 06/17/02
Go up one level in this thread
On June 17, 2002 at 01:02:17, Gian-Carlo Pascutto wrote: >On June 16, 2002 at 23:23:34, Robert Hyatt wrote: > >>There is _no_ solution if you want to reuse the old values (I do this >>also). You just have to accept the instabilities as a part of this reuse >>approach... > >Hmm, I always thought Crafty cleared the hash on each move. In any >case, I can't remember seeing a fail low/fail high combination in >Crafty, so it certainly doesn't seem to suffer a lot from this... > >-- >GCP Crafty doesn't clear the hash table between moves. With a couple of exceptions... If something significant changes so that some scoring terms are updated, then the _scores_ are marked invalid in the hash table. But the best move is kept. fail high and fail low happens regularly. Just look thru a log file and notice all the "++" lines. Look for a ++ line followed by a -> line which says the search failed high, then failed low, and the iteration completed. That isn't uncommon nor can it be stopped without clearing the hash between searches..
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