Author: Robert Hyatt
Date: 07:06:38 12/09/01
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On December 09, 2001 at 09:42:04, Russell Reagan wrote: >Has anyone ever encountered a situation where their program has hashed 3 >positions the same, resulting in the same hash key, in turn refusing the move >because it declared a 3-fold repetition? I haven't seen that, because I simply don't see collisions with 64 bit keys. There are other problems however. repetitions and 50-move draws have real problems when dealing with hashing. Because you can get a non-draw score from the hash, before you get a chance to go 1 or 2 plies deeper to detect the repetition or 50-move rule draws. Hashing is a problem for either of these since we hash positions, and not paths...
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