Author: Dann Corbit
Date: 15:48:56 11/30/01
Go up one level in this thread
On November 30, 2001 at 13:34:19, ALI MIRAFZALI wrote:
>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).
Good news! Chess has been _SOLVED_ by Phalanx. And it only took a 17 second
search. Very impressive, if you ask me.
[ white, 1 ]
r1b2r2/pp1nqn1k/2pp2pb/4Pp1p/2PP1p1N/2N3BP/PPQ1B1P1/3RR1K1 w - -
r1b2r2/pp1nqn1k/2pp2pb/4Pp1p/2PP1p1N/2N3BP/PPQ1B1P1/3RR1K1 w - -
-> increment adds 1440 s to soft time limit
-> soft time limit 3154.28 s
-> hard time limit 41599.9 s
5 -> 0:00.63 73434 0 turns
6 114 84 105930 Be2xh5 Nf7-h8 Pe5xd6 Qe7xd6 Pc4-c5 Qd6-f6
6 -> 0:01.63 236003 0 turns
7 114 203 309066 Be2xh5 ??
7 37 256 412540 Be2xh5 Nf7-h8 Pe5xd6 Qe7xd6 Bg3-f2 Pg6xh5
Nh4xf5 Qd6-g6 Re1-e7 Rf8-f7
7 38 346 564546 Pe5xd6 Qe7xd6 Bg3-f2 Nd7-f6 Pc4-c5 Qd6-c7
7 -> 0:07.86 1297663 1 turn
8 53 1148 1908303 Pe5xd6 Qe7xd6 Bg3-f2 Nd7-f6 Pc4-c5 Qd6-d8
Be2-f3 Nf6-d5 Nc3xd5
8 58 1783 3040911 Nh4xg6 !
8 58 1880 3202058 Nh4xg6 Kh7xg6
8 -> 0:23.26 3952121 1 turn
9 57 3743 6322229 Nh4xg6 Kh7xg6 Qc2xf5 Kg6-g7 Be2-d3 Rf8-h8
Qf5-g6 Kg7-f8 Pe5xd6 Qe7-g5 Re1-e7
9 -> 1:05.44 11268170 0 turns
10 89 10522 17729359 Nh4xg6 Kh7xg6 Qc2xf5 Kg6-g7 Be2-d3 Rf8-h8
Pe5xd6 Qe7-g5 Bg3-f2 Qg5xf5 Bd3xf5 Nf7xd6
Bf5xd7 Bc8xd7 Re1-e7 Kg7-g6 Re7xd7 Nd6xc4
10 -> 2:54.65 29508953 0 turns
11 73 30514 50764706 Nh4xg6 Kh7xg6 Qc2xf5 Kg6-g7 Be2-d3 Rf8-h8
Qf5-g6 Kg7-f8 Pe5xd6 Qe7xd6 Qg6xd6 Nf7xd6
Bg3-h4 Nd6-e8 Re1-e7 Nd7-f6 Rd1-e1
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