Author: ALI MIRAFZALI
Date: 10:34:19 11/30/01
The following Position is Taken from a Game Played by IGM Yuri Shulman in a recent tournament in the USA: [D] r1b2r2/pp1nqn1k/2pp2pb/4Pp1p/2PP1p1N/2N3BP/PPQ1B1P1/3RR1K1 w - 1 0 In this position Amazingly 19.Nxg6!!! Wins by Force .However Fritz 6 does not find this move however Chessmaster 8000 does! However there is a slight problem Here is the line given by Chessmaster 8000 when run after about 3.5 minutes. Time:3:32 Depth 10 Score:0.09 Positions :13062068 Line:19.Nxg6 Kxg6 20.Qxf5+ Kg7 21.Bd3 Rh8 22.Qg6+ Kf8 23.exd6 Qg5 24.Qxg5 Bxg5 25.Bh2 The Problem Here is that Chessmaster 8000 changes its mind at higher plys! to the inferior 19.exd6. Here is the Analysis Time:40:02 Depth 12 Score:0.00 Positions :149376486 Line:19.exd6 Qxd6 20.c5 Qf6 21.Bf2 Ng5 22.Nf3 b5 23.d5 Nxf3+ 24.gxf3 a6 25.dxc6 Qxc6. Now we come to the Most intertesting part of this article;that is why 19.Nxg6 wins.In the actual game there was 19.Nxg6 Kxg6 20.Qxf5+ Kg7 21.Bd3 Rh8 22.Qg6+ Kf8 .and now 23.e6!! instead of 23.exd6 as given by Chessmaster 8000. So Therefore one has to feed 23.e6!! in the line starting with 19.Nxg6 to see that 19.Nxg6 actually wins. This is confirmed by chessmaster 8000 as follows: Time:10:54 Depth 11 Score:1.17 Positions : 43387513 Line:23.e6 fxg3 24.exf7 Be3+ 25.Kh1 Ne5 26.dxe5 Qxe5 27.Ne4 Bf5 28.Qxd6+ Qxd6 29.Nxd6 Bg4 In this line if Black tries 24... Qxf7 he will be crushed by 25.Qd6+ Kg8 26.Re6! Ne5 27.Rf6 Qd7 28.Qxe5 Bg7 29.Rdf1 Rh6 (with a 3 pawn advatage to white according to CM 8000).So 19.Nxg6!!! is actually winning. In the actual game Black blundered with 23...Rg8? and lost after 24.Bh4 Rxg6 25.Bxe7+ Kxe7 26.exd7+ Re6 27.dxc8=Q 1-0 No program other than CM8000 even comes close to suggesting 19.Nxg6!!! .And even CM8000 changes its mind and does not see the winning lines. It is My opinion that this position should serve as a BENCHMARK for the progress of future programs/Computers.It is only when a program can clearly see why 19.Nxg6!!! wins can one write chess as pratically solved by Computers. I am howeverinterssted in results by other programs.(at this point I donot think anyprogram will see this:but I am still curious).
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