Computer Chess Club Archives




Subject: Re: Fail Soft question

Author: Robert Hyatt

Date: 09:40:32 02/18/06

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On February 18, 2006 at 07:52:10, David B Weller wrote:

>Hi Vincent,
>Yes. That is what I am doing. Will try and remove those.
>Let me make sure I understand perfectly:
>If a hash entry is LOWER or UPPER bound AND exceeds current search bounds, just
>return bounds. Do NOT return hashed value.

Doesn't sound right.  You always want to return the most _accurate_ information
you can.  If you know that the score is lower than X (from the table), and if X
is lower than your current alpha value, return the table value.  That's the
whole idea of fail-soft.  Otherwise it isn't fail-soft if you just return the
bound you already have.

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