Author: Vasik Rajlich
Date: 02:43:19 12/29/05
Go up one level in this thread
On December 28, 2005 at 15:18:59, Albert Silver wrote: >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 >>>>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 >>> >>>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. >> >>Vas > >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. > > Albert Yup. Of course you have to be careful when sacrificing, as this game shows. One nice thing about having an extra pawn is there is almost always a long-term plan, only some blockade positions are an exception. Dynamic play can peter out .. Vas
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