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Subject: Re: hash and checks

Author: Dieter Buerssner

Date: 07:10:30 01/20/01

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On January 20, 2001 at 00:10:45, Robert Hyatt wrote:

>Two things.  1.  You have to correct mate scores to be relative to the current
>ply when you store them.  2. You only do this if you are storing an EXACT score.
>I once had a _horrible_ bug because I was also adjusting bounds (which can be
>mate scores at times) and adjusting the bounds will play hell with the search
>for mates.. :)

I cannot see, why adjusting lower bound or upper bound scores is wrong.
If you have a lower bound score, that says, that this is a mate to 10 or better
from the root position, and you are 2 plies down in the search, this means,
that the score is a mate in 9 or better from this position. If you later
hit the same position 4 plies down from the root position, you know, that
this line yields a mate in 11 or better from the root.

I must be missing something ...

Dieter




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