Author: Dieter Buerssner
Date: 17:48:51 01/09/03
Go up one level in this thread
On January 09, 2003 at 20:12:11, Gordon Rattray wrote:
>[D] 8/pp5p/4k1p1/3p4/2pPPK2/2P5/PP5P/8 b - - 0 41
>
>In this position, with Black to move, I was surprised by the consideration given
>to g5+ by some programs. From a "human" point of view, doesn't it just look to
>give White an easy win?
>
>Deep Fritz 7 avoids g5+ completely, but Shredder Paderborn, Chess Tiger 14 and
>CM9000 are, in my opinion, relatively slow to identify g5+ as losing for Black.
>They all very quickly see Black is lost after playing a further Kxg5.
It is possible, that the branching factor gets better, after Kxg5, and so they
reach the depth faster.
>I think initially h6 is best with a likely draw, but the main point is that g5+
>is definitely not best.
Yace, P4 2.53 needs 46 seconds to avoid g5:
18561871 20.038 -0.12 14. 41...g5+ 42. Ke3 b5 43. b3 cxb3 44. exd5+ Kxd5
45. axb3 a5 46. Kd3 Kc6 47. c4 bxc4+ 48. bxc4
{HT} {0}
26332519 28.183 -0.52 15-- 41...g5+ 42. Kxg5 dxe4 43. Kf4 e3 44. Kxe3 Kd5
45. a3 Ke6 46. h3 b6 47. Kd2 Kf5 48. h4 Kg4 49.
Ke3 Kxh4 {0}
32451221 34.848 -1.50 15t 41...g5+ 42. Kxg5 dxe4 43. Kf4 Kd5 44. a4 b6
45. h4 e3 46. Kxe3 a6 47. h5 h6 48. Kf4H b5H
49. a5H b4H {-80}
42353414 45.548 -1.49 15t+ 41...b5 42. exd5+ Kxd5 43. Kg5 Ke4 44. a3 a6
45. Kh4 b4 46. axb4 Kf5 47. d5 h5 48. Kg3 Kg5
49. d6 Kf6 {-80}
49510703 53.951 -1.10 15t 41...b5 42. exd5+ Kxd5 43. Kg5 b4 44. h4 b3 45.
a4 a5 46. Kh6 Ke4 47. d5 Ke5H 48. d6H Kxd6H 49.
Kxh7H g5H 50. hxg5H {-80}
54536861 59.717 -1.09 15t+ 41...dxe4 42. Kxe4 h5 43. h3 Kd6 44. a3 Ke6 45.
d5+ Kf6 46. Kd4 b5 47. d6 a6 48. h4 Kf7 49.
Ke4H Ke6H 50. Kf4H Kxd6H 51. Kg5H Kd5H 52. Kh6H
a5H 53. Kg5H a4H 54. Kxg6H Ke4H 55. Kxh5H Kf5H
{HT} {-80}
65206285 1:11.7 -0.86 15t 41...dxe4 42. Kxe4 h5 43. d5+ Kf6 44. Kd4 g5
45. Kxc4 g4 46. Kd4 h4 47. Ke4 g3 48. hxg3 hxg3
49. Kf3 Ke5 50. Kxg3H {-160}
75230141 1:23.0 -0.85 15t+ 41...h6 42. exd5+ Kxd5 43. b3 cxb3 44. axb3 b6
45. h3 a5 46. Ke3H g5H 47. Kf3H h5H 48. Ke3H
g4H 49. h4H {HT} {0}
81737459 1:30.2 -0.18 15t 41...h6 42. exd5+ Kxd5 43. b3 cxb3 44. axb3 a5
45. Ke3 b5 46. Kd3 g5 47. c4+ bxc4+ 48. bxc4+
Kc6 49. Ke4H a4H 50. Kd3H {0}
83765271 1:32.5 -0.18 15. 41...h6 42. exd5+ Kxd5 43. b3 cxb3 44. axb3 a5
45. Ke3 b5 46. Kd3 g5 47. c4+ bxc4+ 48. bxc4+
Kc6 49. Ke4 a4 50. Kd3 {0}
97514595 1:47.8 -0.12 16t 41...h6 42. exd5+ Kxd5 43. b3 cxb3 44. axb3 a5
45. Ke3 b5 46. Kd3 a4 47. Kc2 g5 48. Kb2 Kc6
49. Ka3 axb3 50. Kxb3 g4 {0}
112142996 2:03.9 -0.12 16. 41...h6 42. exd5+ Kxd5 43. b3 cxb3 44. axb3 a5
45. Ke3 b5 46. Kd3 a4 47. Kc2 g5 48. Kb2 Kc6
49. Ka3 axb3 50. Kxb3 g4 {0}
158560256 2:56.2 -0.13 17t 41...h6 42. a4 g5+ 43. Kf3 h5H 44. a5H Kd6H 45.
e5+H Ke6H 46. h3H Kf5H 47. Kg2H g4H 48. b4H
gxh3+H 49. Kf2H b6H 50. axb6H {0}
Regards,
Dieter
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