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Subject: Hiarcs 7.32 vs Fritz 5.32 Performance Mystery

Author: James T. Walker

Date: 18:32:06 06/22/99


Hello,
I believe the mystery of why Hiarcs 7.32 plays better in engine/engine games is
because of the way Hiarcs does not reset it's hash tables after each move.  This
is an advantage because Fritz does.  The result is that Fritz must start it's
search at ply 1 each time even if it has predicted Hiarcs move because no
pondering is allowed in engine/engine testing.  But because of the way Hiarcs
uses it's hash when it is Hiarcs turn to move it still has search info in the
hash memory.  So you will see Hiarcs start it's search at something like:
+-2 (2.68) depth 7/18 00:00:00 27kN.  This is almost as good as pondering
because it saves time in the search.  Effectively Fritz is stripped of it's
"Pondering" while Hiarcs has something almost as good as pondering.  Note this
advantage does not exist in Auto232 operation since Fritz is pondering and when
it guesses Hiarcs next move it is effectively way ahead in it's search.

Jim Walker

P.S.  Any comments welcome.



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