Author: Uri Blass
Date: 08:44:54 12/20/03
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On December 20, 2003 at 11:21:26, Kurt Utzinger wrote: >On December 20, 2003 at 11:03:04, scott farrell wrote: > >>On December 20, 2003 at 10:53:56, Jay Hysenbeg wrote: >> >>>hi, >>>i was wondering what happens when u use low hash for a long time control. to the >>>point where the hash is normaly filled before the eng has made its move. >>>thank you >>>jay h. >> >>well, things start to deteroriate, your move ordering isnt as good etc., and >>your branching factor ends up so bad that it cant get from say 10 ply to 11 ply >>or whatever, it sort of like hits a brick wall somewhere. >> >>To what extent this happends largely depends on your replacement scheme, and how >>well it deals with overwriting entries. >> >>I test changes to my hash by running extremely small hashes, like 16k entries, >>just to see how it will cater. >> >>Scott > > Size of hash tables seem to have much less influence > than I have imagined. This showed a test over 50 games > between Fritz 8 [96 MB hash] against Junior 8 [8 MB hash] > and a second 50 games match Fritz 8 [8 MB hash] vs Junior 8 > [96 MB hash]. The final result was in both matches almost > identical [25m+10s]. > Kurt It is possible that 8 MB is already almost enough for your time control. It is possible that 96 MB is only 10 elo better than 8 MB at the time control that you tested but if you use 12 MB against 1 MB you get bigger difference of 25 elo. I do not expect more than 25 elo based on upper bound of 7 elo for doubling the hash tables. Even if the difference is 24 elo then it means that you can expect only 26.5-23.5 for the stronger side in 50 games and the statistical error in a match of 50 games is more than 1.5 point. Uri
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