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Subject: Positions to store in the hash table

Author: Alvaro Jose Povoa Cardoso

Date: 08:52:33 12/17/03


Hi, all.
I saw several discussions in the past on hash table replacing schemes, optimal
hash table sizes, wich information to store there, etc.
But I don't remember any discussion about what positions are the best candidates
to store in the HT.
What most of us do is to store positions in wich the best move is a fail high
or, an exact score, wich is correct for move ordering purposes.
I was wondering if someone uses a different criteria for choosing positions to
store in the HT.
When in some middle game positions I see a drop in the hash table hits (below
15%) of my engine I sometimes think if there is a better way to improve the
transposition effect, if such a thing can be done.

My best,
Alvaro Cardoso



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