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Subject: Re: Spike-Rybka -From Expert To IM-

Author: Rolf Tueschen

Date: 01:17:06 12/28/05

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On December 28, 2005 at 03:12:23, Vasik Rajlich wrote:

>Interesting game. I didn't like .. h6 and .. g5 by Rybka in the opening (as I
>suspect most human players won't), and there were a few moments in the endgame
>where better resistance could have been put up - but these are relatively minor
>points.
>
>The biggest issue was the incorrect sacrifice of the h6 pawn. The Rybka static
>eval incorrectly gives the following position (and others of a similar type) as
>roughly equal:
>
>[D] 8/1b2b1k1/pp1ppp2/nPq5/P1P1P3/2QRNPP1/8/1N2KB1r b - - 0 27
>
>I'll keep to myself my proposed solution. It's a tricky issue and won't be
>handled until after the Rybka 1.2 release. If anybody wants to share here, I am
>all ears :-)
>
>Vas


I'm just an expert player and have plenty of weaknesses you as IM surely dont
have. But I know how I would see the given position. And excuse me if I
contradict an IM.

1) Of course this position is good for Black. Period.

2) Of course you cant exchange Queens in such a win/lose position! Period.

3) Rybka is very good. Period.

4) But the restrictions for chess in machine chess will always lead to such a
nonsense, namely how Rybka destroyed a promissing position. The reason is simply
the antique, historical, old, well known horizon effect. And there is no trick
to lead a machine around this obstacle. Not by killer moves nor by nullmoves.
Therefore - actually and for the next years - there is something wrong in your
whole approach with the plan for 1.2.

5) There is no trick to avoid the specifical chess Law in computerchess. The
absolute Power of the Concrete in relation to the always very limited view of
the machine due to horizon blindness. In the game against Spike every
experienced player knows that he cant trade Queens in such an open attack
position.

6) Somewhere also YOU (as experienced and tricky IM) must hide the weakness to
allow the telling brilliance of Rybka and that will be the key for your
competitors, talking in engine-engine competition at least.



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