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Subject: Re: Brilliant positional sac by Kasparov. Can any find it?

Author: Vincent Lejeune

Date: 01:52:28 08/06/04

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On August 05, 2004 at 19:42:24, Albert Silver wrote:

>The following position arose in Kasparov-Andersson, Tilburg, 1981. Kasparov,
>only 18 at the time, played a brilliant pawn sac that left Andersson unable to
>develop and to his loss in spectacular fashion. It is a difficult move to find,
>and I am not even sure whether any engine will, yet it is unquestionably the
>best move.
>
>                                         Albert
>
>[D]r2qkb1r/n1pp1pp1/4p1bp/1p6/1P1P3P/P3P1P1/1B1N1P2/R2QKB1R w KQkq -
>
>14.d5 is the move here. Later Gary began the saccing (pieces this time) in the
>following position:
>
>[D]2nq3r/r2pbkp1/2p2p1p/1p5P/1P2N1Q1/P5P1/1B3P2/3RR1K1 w - -
>
>He played 24.Nxf6, though there is probably more than one win at this point.


Shredder (as crafty) think 24.Nxf6 is a blunder
It give +5 to Bd4 and when you follow this line the score rise to +7

Amd@3000+, 384 MB hash

Analysis by Shredder 8:
...
1.Fd4 Tc7 2.Cc5 Fd6 3.Ca6
  +-  (4.31)   Profondeur: 15/33   00:00:19  7614kN
1.Fd4 Tc7 2.Cc5 Fd6 3.Fe3 Fxc5 4.Dg6+ Rf8 5.Fxc5+ De7
  +-  (4.56)   Profondeur: 16/42   00:00:47  20416kN
1.Fd4 Tc7 2.Cc5 Fd6 3.Fe3 Fxc5 4.Dg6+ Rf8 5.Fxc5+ De7 6.Fxe7+ Rg8 7.Dd3 Ta7 8.f4
Txa3
  +-  (5.06)   Profondeur: 16/42   00:00:55  23622kN
1.Fd4 c5 2.bxc5 Rf8 3.Dxd7 Dxd7 4.Fxf6 Fxf6 5.Cxf6 gxf6 6.Te8+ Rxe8 7.Te1+ Ce7
8.Txe7+
  +-  (5.06)   Profondeur: 16/46   00:03:27  86315kN
1.Fd4 c5 2.Cxc5 Cb6 3.Ce6 Txa3 4.Cxd8+ Txd8 5.Fxb6 Fxb4 6.Fxd8 Txg3+ 7.fxg3 Rg8
  +-  (5.31)   Profondeur: 17/44   00:05:25  133464kN
1.Fd4 Tc7 2.Cc5 Fd6 3.Fe3 g5 4.hxg6+ Rg7 5.Ff4 f5 6.Dxf5 Tf8 7.Fxd6 Txf5 8.Fxc7
Dxc7 9.Txd7+ Dxd7 10.Ca6 Rxg6
  +-  (5.31)   Profondeur: 17/49   00:06:58  173239kN


after 24.Nxf6 gxf6 25.Qg6+ Kf8 26.Bc1
the 2 best moves after 3 min depth 16/45

Analysis by Shredder 8:

1. +- (2.64): 3...De8 4.Fxh6+ Txh6 5.Dxh6+ Rf7 6.Dh7+ Rf8 7.h6 Df7 8.Df5 Cd6
2. +- (3.83): 3...d5 4.Td4 f5 5.Fxh6+ Txh6 6.Dxh6+ Rg8 7.Dxc6 Cd6 8.Dxd5+ Rg7
9.Txe7+ Dxe7 10.Dxd6 De8 11.Db6 Te7 12.Tg4+ fxg4 13.h6+ Rf8 14.Dxb5

After some move the eval continue to rise

There's no evidence that 24.Nxf6 is better than Bd4


>
>[Event "It"]
>[Site "Tilburg (Netherlands)"]
>[Date "1981"]
>[Round ""]
>[White "Kasparov Garry (RUS)"]
>[Black "Andersson Ulf (SWE)"]
>[Result "1-0"]
>[Eco "E12"]
>[Annotator ""]
>[Source ""]
>
>1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 Ne4 6.Nxe4 Bxe4 7.Nd2
>Bg6 8.g3 Nc6 9.e3 a6 10.b4 b5 11.cxb5 axb5 12.Bb2 Na7 13.h4 h6
>14.d5 exd5 15.Bg2 c6 16.O-O f6 17.Re1 Be7 18.Qg4 Kf7 19.h5 Bh7
>20.e4 dxe4 21.Bxe4 Bxe4 22.Nxe4 Nc8 23.Rad1 Ra7 24.Nxf6 gxf6
>25.Qg6+ Kf8 26.Bc1 d5 27.Rd4 Nd6 28.Rg4 Nf7 29.Bxh6+ Ke8 30.Bg7 1-0



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