Author: Mark Young
Date: 14:48:17 07/31/04
Go up one level in this thread
On July 31, 2004 at 17:14:49, James T. Walker wrote: >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 I have looked the position for sometime. What is clear is gxf5 is the only good response. Everything else I have looked at proves the Bxf5 right, except gxf5. The one move the GM annotators say loses for sure. I can not find a win for white after Bxf5 gxf5. And the line the GM annotators show to prove that white is winning is clearly wrong Bxf5 gxf5 Qg3+ Kh7 Ng5+ Bxg5 Bxg5 and white is winning say the GM annotators, but next Ra3 seems to save the day. And black is equal or better after Ra3. It seems to me GM Fischer, GM Stein, and the GM annotators were hit with a optical illusion. On the face of it Bxf5 gxf5 looks like suicide. So the sac was declined.
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