Author: Robert Hyatt
Date: 11:05:12 12/05/01
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On December 05, 2001 at 03:24:29, David Rasmussen wrote: >You don't seem to want to comment on the pawn hash collisions in Crafty, that I >have mentioned. Is that because they don't matter or because you don't believe >my experiment and think I have a bug? > >/David I commented once. I have tested this in the past and didn't find any problem worth considering. That isn't to say there isn't a collision problem, but I didn't encounter one when I tested (I did the same test that I did for the 32 vs 64 bit hash signature, by storing the 32 bit pawn hash signature along with a full 32-byte board representation, and when the pawn hash matched and the full board did not, I reported errors.) I didn't find enough errors to be concerned. Certainly not your 300+ in a single search. I don't recall getting more than a couple in a complete game when I tested. I could run it again if you are interested as I didn't save all the results, since it was done a _long_ while back. I used to do 64 bit pawn hash signatures too until someone (Bruce I think) mentioned he used 32 bits there and I thought I would give it a try...
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