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Subject: Re: Black to Move, Avoid Bxa2...Very Hard for Dedicated Units

Author: Terry McCracken

Date: 08:52:03 12/02/05

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On December 02, 2005 at 05:32:24, Martin Giepmans wrote:

>On December 02, 2005 at 04:15:11, Terry McCracken wrote:
>
>>But I suspect not too hard for engines on fast hardware.
>>
>>This position is taken from a G/20 I played against Chessmaster 9000...it took
>>the a-pawn...I really need a fast computer!:(
>>
>>The up-side of course it gave me a winning position!:o)
>>
>>[D]3r2k1/p1p2p1p/p2b1p2/3b2p1/3P4/2B2PN1/PPP3PP/2KR4 b - - 0 1
>>
>>Terry
>
>
>My engine never considers Bxa2 because it has code for trapped bishops in its
>eval. I guess that most engines have that. I added it when Spider was still very
>young, after a few games in which it made this (from a human viewpoint) rather
>silly mistake.
>Btw, Fisher also took the pawn in a similar situation in a game against Spasski
>in Iceland (the second of their 1972 match, iirc) but that was a bit more
>complicated and perhaps not so silly after all .. ;)
>
>Martin

Yes Fischer did, thinking he could escape. BTW Fischer still had a draw after
this capture, but blew it. This case is a bit different due to the Bishop Pair,
and Rook on the D-File the best you can do is win the exchange.

IOW the win is tricky after ..Bxa2?!

Terry



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