Author: Gian-Carlo Pascutto
Date: 06:46:28 05/26/02
Go up one level in this thread
On May 26, 2002 at 08:36:08, Sune Larsson wrote:
> [D]k7/1p6/7p/4P1p1/8/6P1/6PP/1K6 b - - 0 50
>
> This pawn ending is lost for white.
>
> Test 3: Steer into this ending with 47.-Qxa4+!
> Evaluate the above position as won for black.
Hard. I don't see this statically so I can't solve the above
two. With search, it sees black is 'winning' after 13 plies:
Sjeng: go
Endgame phase.
Time for move : 100000000
2 -139 0 57 Kb8 ??
2 -139 0 91 Kb8 e6
3 -89 0 139 Kb8 !!
3 -65 0 242 Kb8 Kc2 Kc7
3 -65 0 314 Kb8 Kc2 Kc7
4 -139 0 340 Kb8 ??
4 -139 0 637 Kb8 Kc2 Kc7 e6
4 -139 0 652 Kb8 Kc2 Kc7 e6
5 -89 0 1069 Kb8 !!
5 -67 0 1648 Kb8 Kc2 Kc7 Kd3 Kc6
5 -67 0 1955 Kb8 Kc2 Kc7 Kd3 Kc6
6 -117 0 2144 Kb8 ??
6 -120 1 4296 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4
6 -120 1 4364 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4
7 -70 2 7353 Kb8 !!
7 -63 2 9865 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 Ke6
7 -63 3 11246 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 Ke6
8 -63 5 19836 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 Ke6 Ke4
8 -63 7 25599 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 Ke6 Ke4
9 -38 10 39690 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 Ke6 Ke4 b5
9 -38 12 48050 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 Ke6 Ke4 b5
10 -38 18 76932 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 Ke6 Ke4 b5 Kd4
10 -38 21 92123 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 Ke6 Ke4 b5 Kd4
11 -8 30 142365 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 Ke6 h4 b5 hxg5 hxg5 g4
11 -8 36 169377 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 Ke6 h4 b5 hxg5 hxg5 g4
12 -3 54 264817 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 b5 Kd3 Ke6 Kd4 <Ke7> <g4>
12 -3 64 318486 Kb8 Kc2 Kc7 Kd3 Kd7 Kd4 b5 Kd3 Ke6 Kd4 <Ke7> <g4>
13 27 100 526874 Kb8 Kc2 Kc7 Kd3 Kd7 h4 b5 hxg5 hxg5 g4 b4 Kc4 Ke6 Kd4
<Kd7> <g3>
13 27 118 627289 Kb8 Kc2 Kc7 Kd3 Kd7 h4 b5 hxg5 hxg5 g4 b4 Kc4 Ke6 Kd4
<Kd7> <g3>
14 77 150 823371 Kb8 !!
14 94 252 1480170 Kb8 Kc2 Kc7 Kc3 Kd7 h4 b5 hxg5 hxg5 g4 Ke6 Kd4 b4 g3
b3
14 94 277 1638127 Kb8 Kc2 Kc7 Kc3 Kd7 h4 b5 hxg5 hxg5 g4 Ke6 Kd4 b4 g3
b3
15 123 428 2583314 Kb8 Kc2 Kc7 Kc3 Kd7 Kd3 b5 Kd4 Ke6 Kc5 Kxe5 Kxb5 h5
Kc4 g4 <Kd3>
15 123 473 2841044 Kb8 Kc2 Kc7 Kc3 Kd7 Kd3 b5 Kd4 Ke6 Kc5 Kxe5 Kxb5 h5
Kc4 g4 <Kd3>
16 120 850 5217545 Kb8 Kc2 Kc7 Kc3 Kd7 Kd3 Ke6 Kd4 g4 h3 b5 hxg4 b4 g5
b3 Kd3 hxg5
16 120 946 5854471 Kb8 Kc2 Kc7 Kc3 Kd7 Kd3 Ke6 Kd4 g4 h3 b5 hxg4 b4 g5
b3 Kd3 hxg5
17 116 1938 13527622 Kb8 Kc2 Kc7 Kc3 Kd7 Kd3 Ke6 Kd4 b5 g4 b4 Kc4 Kxe5
Kxb4 Ke6 Kc3 Kf6 <Kc2>
17 116 2152 15085459 Kb8 Kc2 Kc7 Kc3 Kd7 Kd3 Ke6 Kd4 b5 g4 b4 Kc4 Kxe5
Kxb4 Ke6 Kc3 Kf6 <Kc2>
18 115 4878 36146787 Kb8 Kc2 Kc7 Kc3 h5 Kd3 Kd7 Kd4 Ke6 <h3> <b5> <h4>
<gxh4>
18 115 5358 39673092 Kb8 Kc2 Kc7 Kc3 h5 Kd3 Kd7 Kd4 Ke6 <h3> <b5> <h4>
<gxh4>
19 113 14142 101455981 Kb8 Kc2 Kc7 Kc3 h5 Kd4 Kd7 Kc5 Ke6 Kb6 Kxe5 Kxb7 Kd6
Kb6 g4 <h3> <Ke6> <Kc7>
19 113 15332 110155997 Kb8 Kc2 Kc7 Kc3 h5 Kd4 Kd7 Kc5 Ke6 Kb6 Kxe5 Kxb7 Kd6
Kb6 g4 <h3> <Ke6> <Kc7>
Yace doesn't do better:
32978838 39.986 -0.15 19t 50...Kb8 51.Kc2 Kc7 52.Kc3 Kd7 53.Kd4 Ke6
54.Ke4 h5 55.Kd4 h4 56.g4 b6 57.h3H b5H 58.Ke4H
b4H 59.Kd4H b3H 60.Kc3H b2H 61.Kxb2H Kxe5H
62.Kc3H Kf4H 63.Kd4H Kg3H 64.Ke5H Kxg2H 65.Kd5H
Kxh3H 66.Ke5H Kg2H 67.Kf5H {HT} {80}
33458492 40.878 -0.15 19. 50...Kb8 51.Kc2 Kc7 52.Kc3 Kd7 53.Kd4 Ke6
54.Ke4 h5 55.Kd4 h4 56.g4 b6 57.h3 b5 58.Ke4 b4
59.Kd4 b3 60.Kc3 b2 61.Kxb2 Kxe5 62.Kc3 Kf4
63.Kd4 Kg3 64.Ke5 Kxg2 65.Kd5 Kxh3 66.Ke5 Kg2
67.Kf5 {HT} {80}
43943710 56.758 0.00 20t 50...Kb8 51.Kc2 Kc7 52.Kc3 Kd7 53.Kd4 Ke6
54.Ke4 h5 55.Kd4 g4 56.Ke4 b5 57.Kd4 b4 58.h4H
gxh3H 59.gxh3H Kf5H 60.e6H Kxe6H 61.Kc4H b3H
62.Kxb3H Ke5H 63.Kc2H Ke4H 64.Kd1H Kf3H 65.g4H
hxg4H 66.hxg4H Kxg4H {HT} {0}
44734593 59.780 0.00 20. 50...Kb8 51.Kc2 Kc7 52.Kc3 Kd7 53.Kd4 Ke6
54.Ke4 h5 55.Kd4 g4 56.Ke4 b5 57.Kd4 b4 58.h4
gxh3 59.gxh3 Kf5 60.e6 Kxe6 61.Kc4 b3 62.Kxb3
Ke5 63.Kc2 Ke4 64.Kd1 Kf3 65.g4 hxg4 66.hxg4
Kxg4 {HT} {0}
76840822 1:49.4 0.10 21t 50...Kb8 51.Kc2 Kc7 52.Kc3 Kd7 53.Kd3 Ke6
54.Kd4 b5 55.h4 g4H 56.Kc3H Kxe5H 57.Kd3H h5H
58.Ke3H Ke6H 59.Kd2H Kd6H 60.Kc1H Ke5H 61.Kc2H
b4H 62.Kb3H Ke4H 63.Kxb4H Ke3H 64.Kc4H Kf2H
65.Kd4H Kxg2H 66.Ke4H Kxg3H 67.Ke3H Kxh4H
68.Kf4H g3H 69.Kf3H g2H 70.Kxg2H Kg4H 71.Kf2H
Kg5H 72.Kf3H Kh4H {80}
79379511 1:54.6 0.10 21. 50...Kb8 51.Kc2 Kc7 52.Kc3 Kd7 53.Kd3 Ke6
54.Kd4 b5 55.h4 g4 56.Kc3 Kxe5 57.Kd3 h5 58.Ke3
Ke6 59.Kd2 Kd6 60.Kc1 Ke5 61.Kc2 b4 62.Kb3 Ke4
63.Kxb4 Ke3 64.Kc4 Kf2 65.Kd4 Kxg2 66.Ke4 Kxg3
67.Ke3 Kxh4 68.Kf4 g3 69.Kf3 g2 70.Kxg2 Kg4
71.Kf2 Kg5 72.Kf3 Kh4 {80}
108545079 2:32.3 0.27 22t 50...Kb8 51.Kc2 Kc7 52.Kc3 Kd7 53.Kd3 Ke6
54.Kd4 b5 55.h4 g4 56.Ke4 b4 57.Kd4 {HT} {-80}
110873263 2:37.9 0.27 22. 50...Kb8 51.Kc2 Kc7 52.Kc3 Kd7 53.Kd3 Ke6
54.Kd4 b5 55.h4 g4 56.Ke4 b4 57.Kd4 {HT} {-80}
134886865 3:12.1 0.67 23++ 50...Kb8 51.Kc2 Kc7 52.Kc3 Kd7 53.Kd3 Ke6
54.Kd4 b5 55.h4 g4 56.Ke4 b4 57.Kd3 Kxe5 58.Kc2
Ke4 59.h5 Kf5 60.Kb3 Kg5 61.Kxb4 Kxh5 62.Kb5
Kg6 63.Ka5 h5 64.Kb5H Kf6H 65.Kc5H Ke6H 66.Kd4H
{HT} {0}
219449128 5:05.5 0.67 23t 50...Kb8 51.Kc2 Kc7 52.Kd3H Kd7H 53.h4H Ke6H
54.Ke4H g4H 55.Kf4H b5H 56.Ke4H b4H 57.Kd4H b3H
58.Kd3H Kxe5H 59.h5H Kf5H {HT} {0}
223986611 5:14.5 0.67 23. 50...Kb8 51.Kc2 Kc7 52.Kd3 Kd7 53.h4 Ke6 54.Ke4
g4 55.Kf4 b5 56.Ke4 b4 57.Kd4 b3 58.Kd3 Kxe5
59.h5 Kf5 {HT} {0}
None of these scores is very convincing...
--
GCP
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