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Subject: Re: Another GM sac refuted by computers??

Author: James T. Walker

Date: 14:14:49 07/31/04

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On July 31, 2004 at 10:21:28, Vincent Lejeune wrote:

>On July 31, 2004 at 07:24:15, Mark Young wrote:
>
>>[d]3q3r/4b1k1/4P1p1/rpp2p1p/1nn2Q2/5N1P/P4PP1/RBB1R1K1 w
>>Another GM sac refuted by computers?
>>
>>This position is from...
>>
>>GM Fischer - GM Leonid Stein
>>Interzonal, Sousse 1967
>>
>>GM Fischer played the (so called) winning move Bxf5! Annotators claim GM Fischer
>>wins easily after Bxf5! gxf5 Qg3+ Kh7 Ng5+ Bxg5 Bxg5 Qe8(or Qd3).
>>
>>For this reason GM Stein played Qf8? and lost...but Bxf5 gxf5! seems to more
>>then hold the position. Do any computers or humans disagree.
>>
>>Example line.
>>Bxf5 gxf5! Qg3+ Kh7 Ng5+ Bxg5 Bxg5 Ra3!.
>
>after the forced line Bxf5 gxf5! Qg3+ Kh7 Ng5+ Bxg5 Bxg5 Ra3!
>
>[D]3q3r/7k/4P3/1pp2pBp/1nn5/r5QP/P4PP1/R3R1K1 w - - 0 1
>Analysis by Shredder 8; amd@3000+ ; 2 best lines after 10 min
>
>1. ³ (-0.55): 5.Df4 Df8 6.Tad1
>2. -+ (-1.76): 5.Dh4 De8 6.Ted1 Cd3 7.Fc1 Cxc1 8.Taxc1 Dxe6 9.Te1 Dc6 10.Dxh5+
>Dh6 11.Dxf5+ Dg6 12.Dxc5 Dxg2+ 13.Rxg2 Tg3+ 14.fxg3 Ce3+ 15.Txe3
>
>Fischer blundered and his opponent followed him ! ;o)

I don't agree.  First of all the line you give as "forced" is not forced.  I
guess it was provided by the "experts" who said it was a great sac.  I doubt
that computers can prove that Bxf5 is either good or bad at this time.  There is
still a lot of chess to be played after gxf5.  Even gxf5 may not be the best
response.
Jim



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