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Subject: Re: hashing and nullmove

Author: Robert Hyatt

Date: 09:59:44 06/26/03

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On June 26, 2003 at 08:58:06, Martin Bauer wrote:

>Hi,
>
>I am thinking about the problems with hashing AND nullmove. Is there something
>known to take care about?
>
>How about writing scores to the table in lines where some nullmoves are done?
>Can I use this values later when a hashhit occours without any extra conditions?
>
>At the moment I use both without taking care about each other and I do not
>notice big problems. But that's no proof, that there aren't any...
>
>Bye
>
>Martin

All you have to be careful of is to record the _correct_ depth when you
store any entry.  Whether or not null-move searches occur farther down in
the tree is irrelevant.  If you reach this same position again, with the
same depth remaining, you should do the _same_ null-move searches then as
welll, so using this result makes perfect sense.



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