Author: Sune Fischer
Date: 13:41:22 12/05/01
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On December 05, 2001 at 15:25:38, David Rasmussen wrote: >On December 05, 2001 at 14:13:32, Robert Hyatt wrote: > >>> >>>We need Bob or some other third party to make tests too I think. >> >>I have already done this. In fact, anyone that _doesn't_ do this is inviting >>great grief. It is essential that the hashed information match _exactly_ the >>computed information for every position. And I do this as part of my debugging >>from time to time, which will often catch a bug where I forget to stick >>something in the pawn hash record, but I use it later anyway. > >I agree, I am doing the same thing with Chezzz. Among a _lot_ of other debugging >checks as well. Chezzz has roughly the same amount of collisions as Crafty, if I >use 32-bit pawn hashkeys instead of 64-bit ones. > >/David I agree, but just because the hashed information doesn't match exactly the computed information doesn't mean you have a collision, it _could_ be something else. You are debugging a lot of stuff by doing this, any number of things could be the cause. Collisions are much easier to detect directly using the 64 bit key for a reference. -S.
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