Author: Uri Blass
Date: 13:40:47 11/15/04
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On November 15, 2004 at 15:57:23, Gerd Isenberg wrote: >Hi, > >i use the difference of weighted pawnbitboards ( 5*whitepawnBB - 3*blackpawnBB ) >mod 65077 as an index for a 64K entry pawnhash-table. Most often my pawnhash >hit-rate is quite ok, > 95% or even 99%. But it seems that a lot of pawn levers >decrease my hit-rate due to collisions. > >With "maximum lever" positions my pawnhash hit-rate is only about 75% after a 30 >second search on my amd64 2.2GHz box (~80% without eval hashing). > >I guess a zobrist-key pawn-hashing scheme is better here. >Curious about your pawnhash hit-rates with one of the positions below. I have no pawn hash tables so I have no pawn hash hit rates. The only pawn information that I calculate and use is passed pawns,isolated pawns and protected passed pawns and I do not know what is pawn levers. I do not use hash to store the information because I found that pawn hash does not change much for me and updating the bitboards incrementally is about the same speed as storing the information in hash so I decided to go for the simple solution. Uri
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