Computer Chess Club Archives




Subject: double hash tables

Author: Chris Whittington

Date: 03:32:46 10/01/97

CSTal always used to have one depth-based hash table with five bucket
attempts on clashes. After reading the threads in rgcc, I tried it out
with two hash table, an always replace and a depth-priority table.

Some test positions get faster, some get slower, but, on the whole,
there's an improvement.

Until, that is, the hash gets overloaded, when the old depth-only table
starts to come out on top.

Is this a generally observed phenomenon ?


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