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Subject: Re: questions about WAC

Author: Gian-Carlo Pascutto

Date: 03:58:41 12/27/01

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On December 27, 2001 at 03:51:22, Uri Blass wrote:

>The only problem that it could not solve in a reasonable time
>is WAC 2
>I guess that it needs depth 13 in order to solve it
>and the estimated time that
>it needs to get this depth is at least some hours.

Nothing to worry about. WAC 2 is hard, both for search
and eval. I get it at ply 11-13 depending on the extensions.
Usually 10-30s on Athlon 1000.

>The hardest problem for it
>(from the problems that it solved) was WAC 22
>but I consider it as a positional problem because
>there are many moves that win a pawn for white to get equality
>in material.

>Qh5 is one of them and my program found Nxf7 at depth 4
>but changed it's mind at depth 6 to Qh5 only to change
>it's mind later again to Nxf7 at depth 7.

I get +1 for white with Nxf7 at 13 ply.

After playing out Qh5 I get g6 and BLACK up 0.70 pawns.

So Qh5 looks a lot worse as Nxf7 for my program.

--
GCP



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