Author: Roy Eassa
Date: 15:40:58 11/18/02
Go up one level in this thread
On November 18, 2002 at 17:46:35, Roy Eassa wrote:
>White to move and win:
>
>[d] 8/6N1/K2k3B/4p3/8/p7/2PP4/8 w - - 0 1
>
>This is from Pal Benko, an improvement on a study by L. Kubbel. It was in the
>current issue of Chess Life magazine.
>
Here is a more difficult variation on the theme, also from Benko. This one is
suitable for modern PCs/programs.
Black to move but White to win:
[d] K7/8/p7/3k4/3p4/8/2PP1B2/8 b - - 0 4
(Sorry about the move numbers starting at 4 instead of 1; I don't know how to
reset that value without wiping out all the analysis.)
4...d3
[or 4...a5 5.d3!
(5.Bh4? d3! 6.c3 a4 7.Be7 Kc4 8.Kb7 Kb3 9.Kb6 Kc2 10.c4 Kxd2 11.c5 Ke2 =)
5...a4 6.Bh4 a3 7.Bf6 a2 8.c4+ Kc5 9.Kb7 a1Q 10.Be7#]
[or 4...Kc4 5.Kb7 a5
(5...d3 6.c3 a5 7.Kc6 a4 8.Bc5 Kb3 9.Kb5 +-)
6.Kc6 d3
(6...a4 7.d3+ Kc3 8.Kc5 +-)
7.c3 a4 8.Bc5 Kb3 9.Kb5 +-]
5.c4+!
[5.c3? a5 6.Bh4 a4 7.Be7 Kc4 8.Kb7 Kb3 9.Kb6 Kc2 10.c4 Kxd2 11.c5 Ke2 =]
[5.cxd3? a5 =]
5...Kxc4 6.Bb6 Kb5 7.Bd4
[or 7.Kb7 a5 8.Bd4, which transposes]
7...a5 8.Kb7 a4 9.Kc7
[or 9.Bb2 Kb4 10.Kc6 Kb3 11.Bc3 Kc4 12.Kd6 +- as in other lines]
9...Kc4 10.Bc3 Kc5
[10...a3 11.Kd6 a2 12.Ke5 Kb3 13.Kd4 Kc2 14.Ke3 +-]
11.Bb2 Kd5 12.Kb6 Kc4 13.Kc6 Kb3 14.Bc3 Kc4 15.Kd6 a3 16.Ke5 Kb3
17.Kd4 Kc2 18.Ke4 a2 19.Ke3 +-
After Black's clever first move of ...d3, how long does it take for your program
to realize that White's only win is with c4+ ?
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