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Subject: Re: Search instabilities when re-using hashtables

Author: Gian-Carlo Pascutto

Date: 09:35:04 06/17/02

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On June 17, 2002 at 11:23:27, Robert Hyatt wrote:

>Crafty doesn't clear the hash table between moves.  With a couple of
>exceptions...  If something significant changes so that some scoring terms
>are updated, then the _scores_ are marked invalid in the hash table.  But the
>best move is kept.
>
>fail high and fail low happens regularly.  Just look thru a log file and
>notice all the "++" lines.  Look for a ++ line followed by a -> line which
>says the search failed high, then failed low, and the iteration completed.

Ok thanks, I was looking for '--' to see if you had fail lows.

How do you handle the case if it happens? Full-window research?
Ignore fail-high or fail-low?

--
GCP



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