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Subject: Re: Mate in 14 problem

Author: Gian-Carlo Pascutto

Date: 08:21:04 01/05/02

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On January 05, 2002 at 11:04:07, Dieter Buerssner wrote:

>On January 05, 2002 at 10:24:35, Gian-Carlo Pascutto wrote:
>
>>Hmm, too easy :)
>
>You think this. It seems Shirov did not agree with you at some time. At dejanews
>I found this by Richard A Fowell:
>
>Certainly, Shirov put his foot in it when he said that computers wouldn't
>find the forced mate in:
>
>6r1/2rp1kpp/2qQp3/p3Pp1P/1pP2P2/1P2KP2/P5R1/6R1 w - - id "Shirov 1"; bm Rxg7;
>
>Also CM4000 is cited to find it in 2 seconds.

This illustrates that GM's do not really know much about Chess computers
I guess, though perhaps that has improved by now.

The sequence consists of a series of checks chasing the black king,
which has very limited options, into a position where it can be mated.
This is relatively easy for a chessprogram to lock on to, and this is
also why I am not surprised ChessMaster is faster here, as it is
optimized for such situations.

The fact that Sjeng's normal search finds the mate pretty fast (faster
than the matefinder) is a good indication the matefinder is not going
to be particularly fast on the position, of course.

--
GCP



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