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Subject: Re: Spike-Rybka

Author: Albert Silver

Date: 12:18:59 12/28/05

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On December 28, 2005 at 12:44:45, Vasik Rajlich wrote:

>On December 28, 2005 at 08:37:42, Albert Silver wrote:
>>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
>>>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 :-)
>>Is the error related to the rook on the 8th?
>Actually I should take a closer look. This rook gets a very nice bonus compared
>to the one d3, not sure itīs deserved.

I asked because I've noticed how aggressively Rybka evaluates rook penetrations,
usually correctly so, but here the rook is biting on dust. It isn't threatening
or preventing anything, and can easily be evicted by the king+bishop
combination. I just wonder whether this was what caused the pawn sac in the
first place.


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