Author: Ingo Lindam
Date: 14:58:43 11/21/02
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On November 21, 2002 at 15:39:27, Robert Hyatt wrote: >On November 21, 2002 at 12:39:24, Matthias Gemuh wrote: >>Some hasty and wrong thinking then, when I implemented my pawn hash. >>Maybe I somehow excluded strange positions like all pawns on 2nd and 3rd rows. >>I shall check my code and logic later. >>I generate keys such that they lie in range 1..2x64kB and use them as index. >>I hit 95%..99% in middle game and WAC. >Just one white pawn gives you 48 different positions. >one white pawn and one black >pawn gives you 48*48 different positions. or, rounding down a bit, 48 could be >replaced by 2^5 (32). 48*48 could be approximated by 2^10 or 1024. two more >pawns and we are going to blow past 64K positions. I don't see a contradiction between the two statements. Aside from there are just 48*47 possible positions with one white and one black pawn you count a lot of positions having nothing todo with chess reallity and even more positions being atleast very unlikely. I can imagine that there are not more than 2x64k positions covering 95% of the occuring midgame positions. [D] 8/1ppppppp/7p/8/8/P7/PPPPPPP1/8 w - - internette Gruesse, Ingo
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