Author: David Rasmussen
Date: 14:50:15 12/03/01
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On December 02, 2001 at 23:58:43, Robert Hyatt wrote: >On December 02, 2001 at 22:38:30, David Rasmussen wrote: > >>Many people use 32-bit pawn hashkeys. But I've found that 32 bits is not enough >>to avoid collisions. 64-bit seems to be enough, and maybe less could do the job. >>Why do people use 32-bit keys, when it screws up evaluation this way? >> >>/David > > >32 is ok for pawns. To see why, figure out how many _different_ positions >there are with only pawns on the board. The number is not as large as you >might think, which makes collisions unlikely so long as you _only_ hash pawn >positions. Are you saying that if I'm seeing collisions, I have a bug, or are you saying that 300 collisions out of 60.000.000 successful probes is not a problem? If the latter, then why? How can you be sure? /David
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