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Subject: Re: Fail high reductions

Author: Martin Bauer

Date: 15:10:46 07/01/03

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On July 01, 2003 at 17:34:47, Russell Reagan wrote:

>From "Fail High Reductions by Rainer Feldmann"
>
>"...a fail high node is a node 'v' with a search window of [alpha,beta] at which
>a static evaluation function 'c' produces a cutoff. The FHR-algorithm reduces
>the search depths at these fail high nodes thus searching their subtrees with
>less effort."
>
>Their subtrees? I thought fail high nodes didn't have subtrees, and that you
>return beta at a fail high node. I must be misunderstanding something. Could
>someone give a simple explaination of how fail high reductions work?

No, hope I am right:

You evaluate in even at inner nodes. If your static evaluation is already better
than beta, you expect a beta cutoff. So you reduce the remaining depth to get
the cutoff.

May be there are some extra condiotons for the reduction.

Martin




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