Author: Dieter Buerssner
Date: 04:02:11 02/25/04
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On February 25, 2004 at 05:56:16, martin fierz wrote: >it won't pop *my* eyes. i once reduced hash key sizes in my checkers program >beyond all sensible settings, because there was a discussion here about whether >you really need 64-bit keys. in my checkers program, i have 64 bit keys, but >effectively it's only using about 52 bits. i have about a 20 bit part which is >used for the hashindex with %, and of the remaining 44 bits i store only 32 as a >check. i reduced those 32 down to about 8 (!!) bits and in 100 test positions >only saw one different move played IIRC. ridiculous, i must have lots of >collisions there. unfortunately, i didn't count the collision number, or write >down the results - but i know what you're talking about! Almost the same experiment with my chess engine (inluding many details, like the effective number of bits used, and going down to 8 bits only): http://chessprogramming.org/cccsearch/ccc.php?art_id=190318 Regards, Dieter
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