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Subject: Re: A very hard middlegame/endgame position for computers, who gets it ?

Author: Gian-Carlo Pascutto

Date: 01:55:02 12/16/01

On December 15, 2001 at 22:59:01, Kim Roper Jensen wrote:

>Hi
>
>Here is a little middlegame/endgame position that seems very difficult for
>computers, maybe because its a drawing combination but anyway here it goes
>
>The correct move to get is Bc3, with the idea 1.Bc3,b4 2.axb4,axb4 3.Bxg7!!
>and white either gets the rook and plays Nb6,c4 and have an better endgame or
>the perpetual check f7,h6

White can get it immediately indeed:

Sjeng: go
Endgame phase.
Clearing hash...
Time for move : 1200000
 2      -6    35      161  h3 Bc5
 2      -6    36      720  h3 Bc5
 3       0    36     1402  h3 g6 Ne3
 3       0    37     4236  h3 g6 Ne3
 4     -12    37     4971  h3 g6 Ne3 h5
 4     -11    38     7457  Bxg7 !
 4       0    39    13616  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
 5       0    40    17433  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
 5       0    48    50116  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
 6       0    51    63031  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
 6       0    63   117501  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
 7       0    69   146924  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
 7       0   133   424561  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
 8       0   145   496710  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
 8       0   232   891644  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
 9       0   257  1019496  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
 9       0   492  2111211  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
10       0   540  2361408  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
10       0  1627  7492490  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>
11       0  1747  8126688  Bxg7 Nxg7 Nh6+ Kh8 Nxf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8>
<Nh6+> <Kh8> <Nf7+> <Kg8> <Nh6+> <Kh8>

--
GCP

Re: Not according to Speelman, First Bc3 Then Bxg7 se post for vars Kim Roper Jensen 05:56:33 12/16/01

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