Author: Robert Hyatt
Date: 08:33:36 06/02/04
Go up one level in this thread
On June 01, 2004 at 20:39:22, William Bryant wrote:
>If you are re-searching a score from the root that is a mate score
>(alpha is > 32000 or alpha is < -32000),
>should you turn PVS off?
>
>Has this been looked at before?
>
I don't see any reason to do this. The PVS principle applies to mate positions
just as well as it applies to non-mate positions...
>Example code:
>
>//Do PVS
>if ((foundOne) && (alpha < 32000) && (alpha > -32000)) {
> X = -NMSearch(-alpha-1, -alpha, depth+extensions, &line);
> //Don't trust a first fail high until it has been researched
> // therefore don't use (X < beta) in the below equasion
> if ((X > alpha) && (!gAbort))
> X = -NMSearch(-beta, -alpha, depth+extensions, &line);
> }
>else
> X = -NMSearch(-beta, -alpha, depth+extensions, &line);
>
>William
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