Author: Dieter Buerssner
Date: 16:17:36 11/18/02
Go up one level in this thread
On November 18, 2002 at 18:40:58, Roy Eassa wrote:
>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:
>
>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.)
[...]
>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+ ?
It is not so easy to exactly answer this question. Two analysis of Yace, the
first from the position after d3. Yace switches to c4 after about 3 seconds. The
next analysis is by disallowing c4. After about 3 seconds, a rather drawish
score is shown, which practically won't change anymore for few minutes.
Regards,
Dieter
2856358 2.381 2.37 18. 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.Bg5 a3 7.c4 a2 8.Bf6 Kxd2 9.c5 Ke3 {270}
3212148 2.671 1.97 19-- 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.Bf8 Kxd2 7.Bd6 a3 8.c4 Kc3 9.c5 d2 10.Be5+
Kb3 {270}
3311331 2.759 0.97 19-- 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kc6 Kc2
6.c4 Kxd2 7.Bh4 a3 8.Kb7 a2 9.Bf6 Ke2 10.Ka8 d2
11.Bg5 {270}
3655458 3.052 0.56 19t 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 Ke2 8.c6 d2 9.c7 d1=Q 10.c8=Q
Qd4+ 11.Bc5 {270}
4012905 3.344 0.57 19t+ 1.c4+ Ke4
4540077 3.786 1.68 19t 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3H Kc2H 8.Kd5H Kb3H 9.Kd4H
Kc2H 10.Ba5H a3H {270}
4678177 3.893 1.68 19. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3 Kc2 8.Kd5 Kb3 9.Kd4 Kc2
10.Ba5 a3 {270}
4910619 4.091 2.08 20++ 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 Kc4 5.Bc3
Kd5
5352520 4.477 2.19 20t 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3H Kc2H 8.Kd5H a3H 9.Ke4H a2H
10.Ke3H Kb3H {HT}
5979815 4.958 2.19 20. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3 Kc2 8.Kd5 a3 9.Ke4 a2
10.Ke3 Kb3
6707714 5.563 2.44 21t 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Kc7
Kc4 6.Bc3 Kc5 7.Bg7 Kd5H 8.Kb6H a3H 9.Kb5H a2H
10.Ba1H Ke6H 11.Kc4H Kd6H 12.Kb5H Kd5H 13.Kb4H
Kd6H 14.Ka3H Kd5H 15.Kxa2H Ke4H {350}
7537141 6.211 2.44 21. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Kc7
Kc4 6.Bc3 Kc5 7.Bg7 Kd5 8.Kb6 a3 9.Kb5 a2
10.Ba1 Ke6 11.Kc4 Kd6 12.Kb5 Kd5 13.Kb4 Kd6
14.Ka3 Kd5 15.Kxa2 Ke4 {350}
8465918 7.009 2.44 22t 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3 Kc4H 8.Kd6H a3H 9.Ke5H a2H
10.Ke4H Kc5H 11.Ba1H Kd6H 12.Kxd3H Ke6H 13.Ke4H
Kd6H {350}
9551828 7.922 2.44 22. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3 Kc4 8.Kd6 a3 9.Ke5 a2
10.Ke4 Kc5 11.Ba1 Kd6 12.Kxd3 Ke6 13.Ke4 Kd6
{350}
11048781 9.389 2.49 23t 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Kc7
Kc4 6.Bc3 Kc5H 7.Bg7H Kd5H 8.Kd8H Kc4H 9.Ke7H
a3H 10.Ba1H a2H 11.Kf6H Kd5H 12.Kg5H Ke4H
13.Kg4H Kd5H 14.Bc3H Kd6H 15.Kf4H Kd7H 16.Ba1H
Kc7H 17.Ke4H Kd7H 18.Kxd3H Kd6H 19.Ke4H Ke6H
{HT}
12377107 10.463 2.49 23. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Kc7
Kc4 6.Bc3 Kc5 7.Bg7 Kd5 8.Kd8 Kc4 9.Ke7 a3
10.Ba1 a2 11.Kf6 Kd5 12.Kg5 Ke4 13.Kg4 Kd5
14.Bc3 Kd6 15.Kf4 Kd7 16.Ba1 Kc7 17.Ke4 Kd7
18.Kxd3 Kd6 19.Ke4 Ke6
14319021 12.082 2.50 24t 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3 Kc2H 8.Kc5H a3H 9.Kd4H Kb3H
{HT}
16077463 13.652 2.50 24. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3 Kc2 8.Kc5 a3 9.Kd4 Kb3
18646555 15.977 2.84 25t 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3 Kc2 8.Kc5 a3 9.Kd4 Kb3
10.Kxd3 a2 11.Ba1 Kb4 12.Kd4 Kb5 13.Kd5 Kb4
14.d3 {350}
21442369 18.314 2.84 25. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3 Kc2 8.Kc5 a3 9.Kd4 Kb3
10.Kxd3 a2 11.Ba1 Kb4 12.Kd4 Kb5 13.Kd5 Kb4
14.d3 {350}
26677369 23.329 3.07 26t 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Bc3+ Kb5 7.Kc7 Kc5H 8.Bf6H Kd5H 9.Kb6H
a3H 10.Kb5H Ke4H 11.Ka4H a2H 12.Bc3H a1=Q+H
13.Bxa1H Kf3H {HT}
30535891 26.732 3.07 26. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Bc3+ Kb5 7.Kc7 Kc5 8.Bf6 Kd5 9.Kb6 a3
10.Kb5 Ke4 11.Ka4 a2 12.Bc3 a1=Q+ 13.Bxa1 Kf3
37818822 33.577 3.47 27++ 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Kc7
Kc4 6.Bc3 a3 7.Kd6 Kb3 8.Ke5 Ka4 9.Kd4 Kb5
41202497 36.663 3.47 27t 1.c4+ Kxc4 2.Bb6 Kb5H 3.Kb7H a5H 4.Bd4H a4H
5.Kc8H a3H 6.Kd8H a2H 7.Bc5H a1=QH 8.Ba3H {HT}
46186521 41.137 3.47 27. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Kc8 a3
6.Kd8 a2 7.Bc5 a1=Q 8.Ba3
58665337 52.777 3.10 28t 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3 Kc2 8.Kd5 a3H 9.Kd4H a2H
10.Ke3H Kb1H 11.Bh8H Kc2H 12.Bg7H Kb1H 13.Kf3H
Kc1H 14.Kg2H a1=QH 15.Kh1H {HT}
67971562 1:00.9 3.10 28. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3 Kc2 8.Kd5 a3 9.Kd4 a2
10.Ke3 Kb1 11.Bh8 Kc2 12.Bg7 Kb1 13.Kf3 Kc1
14.Kg2 a1=Q 15.Kh1
100485728 1:34.4 3.50 29++ 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kb3 7.Bc3 Kc2 8.Kd5 a3 9.Kd4 a2
10.Ke3 Kb1 11.Bh8 Kc2 12.Bg7 Kb3
103155976 1:36.8 3.50 29t 1.c4+ Kxc4 2.Bb6 Kb5H 3.Kb7H a5H 4.Bd4H a4H
5.Bb2H Kb4H 6.Bg7H a3H 7.Bf8+H Ka4H 8.Kc7H a2H
9.Kd6H a1=QH 10.Ke6H {HT}
112942324 1:45.9 3.50 29. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Bg7 a3 7.Bf8+ Ka4 8.Kc7 a2 9.Kd6 a1=Q
10.Ke6
148538725 2:22.0 3.61 30t 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kc4 7.Bc3 a3 8.Kd6 a2 9.Ke5 Kb3
10.Kd4H a1=QH 11.Bxa1H Kb4H {HT}
168095984 2:40.9 3.61 30. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kb4 6.Kc6 Kc4 7.Bc3 a3 8.Kd6 a2 9.Ke5 Kb3
10.Kd4 a1=Q 11.Bxa1 Kb4
231265192 3:49.5 4.01 31++ 1.c4+ Ke5
261093881 4:20.1 4.10 31t 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kc5 6.Kc7 Kd5 7.Kb6H Ke6H {HT}
292952834 4:58.3 4.10 31. 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kc5 6.Kc7 Kd5 7.Kb6 Ke6
335630137 5:43.1 4.50 32++ 1.c4+ Kxc4 2.Bb6 Kb5 3.Kb7 a5 4.Bd4 a4 5.Bb2
Kc5 6.Kc7 Kd5 7.Kb6 Ke6
Without allowing c4:
2224592 1.807 2.37 18. 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.Bg5 a3 7.c4 a2 8.Bf6 Kxd2 9.Ba1 Ke2 10.c5
{270}
2937443 2.392 1.97 19-- 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.Ka5 Kxd2 7.Bf6 a3 8.c4 a2 9.c5 Ke3 10.c6 d2
11.Bg5+ Kd3 {270}
3112132 2.541 0.97 19-- 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.Bh4 Kxd2 7.Kb7 a3 8.Bf6 a2 9.c4 Ke2 10.Ka8 d2
11.Bg5 {270}
3415042 2.787 0.56 19t 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 Ke2 8.c6 d2 9.c7 d1=Q 10.c8=Q
Qd4+ 11.Bc5 {270}
3611883 2.952 0.56 19. 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 Ke2 8.c6 d2 9.c7 d1=Q 10.c8=Q
Qd4+ 11.Bc5 {270}
4408181 3.578 0.52 20t 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 Ke2 8.c6 d2 9.c7 d1=Q 10.c8=Q
Qb3+ 11.Kc6 a3 {270}
4659105 3.780 0.52 20. 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 Ke2 8.c6 d2 9.c7 d1=Q 10.c8=Q
Qb3+ 11.Kc6 a3 {270}
5912713 4.765 0.56 21t 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 Ke2 8.c6 d2 9.c7 d1=Q 10.c8=Q
Qb3+ 11.Kc6 Qc4+ 12.Bc5 {270}
6205821 5.009 0.56 21. 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 Ke2 8.c6 d2 9.c7 d1=Q 10.c8=Q
Qb3+ 11.Kc6 Qc4+ 12.Bc5 {270}
7900560 6.341 0.55 22t 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 Ke2 8.c6 d2 9.c7 d1=Q 10.c8=Q
Qb3+ 11.Ka7 a3 12.Qg4+ Ke1 {270}
8342051 6.703 0.55 22. 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 Ke2 8.c6 d2 9.c7 d1=Q 10.c8=Q
Qb3+ 11.Ka7 a3 12.Qg4+ Ke1 {270}
10660008 8.583 0.53 23t 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 a3 8.c6 a2 9.Bf6 Ke1 10.c7 d2
11.c8=Q d1=Q 12.Bc3+H Kf1H 13.Qf5+H Ke2H {270}
11247734 9.067 0.53 23. 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 a3 8.c6 a2 9.Bf6 Ke1 10.c7 d2
11.c8=Q d1=Q 12.Bc3+ Kf1 13.Qf5+ Ke2 {270}
14725032 11.925 0.53 24t 1.c3 a5 2.Bh4 a4 3.Be7 Kc4 4.Kb7 Kb3 5.Kb6 Kc2
6.c4 Kxd2 7.c5 a3 8.c6 a2 9.Bf6 Ke3 10.c7 d2
11.c8=Q d1=Q 12.Qe6+H Kf3H 13.Qf5+H Kg2H
14.Qg5+H Kf1H {270}
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