Author: Gian-Carlo Pascutto
Date: 11:40:53 09/26/01
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On September 26, 2001 at 13:05:43, Robert Hyatt wrote: >I really don't want to test with smaller keys. When I tried 32 bits in the >tests Stanback, I and others did, it was horrible. Collisions per second. I >didn't think the search could stand that. However, I have never tried to >determine how many collisions (replace this with bogus scores) the search can >tolerate with no ill side-effects. That would be a _very_ good paper. Which I >suppose I will write if nobody else does... For some anecdotal data: Sjeng has been using 32-bits for normal chess for quite some time and I don't seem to crash & burn (*). Didn't seem to change much going from the cyrix120 to the Athlon 1000 either. However! If I use a large openings book and do not disable probing it after the opening I _have_ gotten collisions and several times so! (and unfortunately in that case a _single_ collision will absolutely kill you) (*) I discovered recently that in about 5-15% of the cases I was getting bogus evaluations back in crazyhouse chess due to a hashing error. It _was_ producing bogus scores in the search, but 'fixing' it doesn't seem to have affected the strength of my program. Amazing isn't it? -- GCP
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