Author: Wayne Lowrance
Date: 15:30:02 11/15/04
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On November 15, 2004 at 16:40:47, Uri Blass wrote: >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 Yea, what the heck is a pawn lever ? Wayne
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