Author: Ron Murawski
Date: 12:05:17 01/19/02
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On January 18, 2002 at 10:44:43, David Rasmussen wrote: >My hashtable implementation has separate tables for white and black, and a part >of each of these tables is depth prioritized. This works ok in general I think. >But I notice that Crafty for one, uses one table, and then inverses the hashkey >in case of probes and stores, when it's black to move. There may be other >implementations as well. > >What are the pros and cons of these approaches, and specifically, why does >Crafty invert the hashkeys in the case of black to move, instead of just hashing >the color into the hashkey? > >/David (who is deparately trying to find a possible hashing bug in Chezzz...) I tried using one table with black-to-move hashed in and it was far slower than using two tables. This seems to fly in the face of conventional wisdom but, for Horizon, this has worked the best. Ron
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