Author: Stuart Cracraft
Date: 10:34:08 12/27/05
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On December 27, 2005 at 04:49:51, Vasik Rajlich wrote: >On December 26, 2005 at 16:52:23, Jonas Cohonas wrote: > >>For long analysis that is, i mean if you have an engine running for say 2 days >>on a position, will it come to another conclusion whether you use 32Mb hash or >>2Gb hash? >> >>In other words will it, at that time control/analysis matter what hash size you >>use? > >I vaguely remember some tests which suggest that every doubling of the hash size >gives 5 or 6 rating points. > >Vas Yes - I recall something from Gordon Goetsch and Hans Berliner at CMU quite some time ago that gave 2x = 8 rating points. It may have been Carl Ebeling. I believe it was the 1970's or 1980's for that figure. And that may have been USCF rating points instead of ELO points. Here is a more recent commentary from 1998 SSDF which gave 4-5 rating points per doubling. http://www.geocities.com/CapeCanaveral/Launchpad/2640/ssdf/1998/ssdf9804.htm And here: http://www.chessassistance.com/Articles/020_Hash_size.html It is no quick way to improved rating unless the table is horribly small already of course. I like to size the table commeasurate with the size of searches I'm doing. Since I don't size dynamically but statically at compile time. I am sure most size dynamically at compile time for flexibility. I haven't done this yet. Stuart
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