Author: Mridul Muralidharan
Date: 04:01:53 03/27/04
Go up one level in this thread
On March 27, 2004 at 02:53:38, Kurt Utzinger wrote:
>On March 26, 2004 at 17:59:54, Mridul Muralidharan wrote:
>
>>Hi all,
>>
>> The following came up in a 40/10/0 match between my program against crafty
>>19.3.
>>
>>crafty says black is about 2.3 up , while mine is giving almost even score
>>(-0.32 actually).
>>What is the actual status of this position ?
>>Completely won for white ? draw ? loss ?
>>The game is still going on , but the evals have been stabilised around this for
>>sometime now ...
>>
>>Regards
>>Mridul
>>
>>[D]2bb4/2p5/1pPp4/pP1PkP2/P5K1/6P1/2B5/8 b - - 0 62
>
> In my opinion it's a rather easy win for Black as White
> will sooner or later get in Zugwang. Below some analysis.
> Anyway a most interesting end game.
> Kurt
>
>[Event "120'/40+60'/20+60'/20"]
>[Site "MyTown"]
>[Date "????.??.??"]
>[Round "?"]
>[White "New game"]
>[Black "?"]
>[Result "*"]
>[SetUp "1"]
>[FEN "2bb4/2p5/1pPp4/pP1PkP2/P5K1/6P1/2B5/8 b - - 0 62"]
>[PlyCount "23"]
>[TimeControl "40/7200:20/3600:20/3600"]
>
>62... Kxd5 63. Kf4 (63. Kh5 Ke5 64. Kg6 d5 65. Bb1 d4 66. Bd3 Be7 67. Bc2 Bb4
>68. g4 Kf4 69. g5 Ke3 70. f6 d3 71. Bd1 (71. Bxd3 Kxd3 72. Kf7 Bf5 73. g6 Bxg6+
>74. Kxg6 Kc4 75. Kf7 Kb3 76. Ke8 Kxa4 77. Kd7 Bd6 78. f7 Kxb5 79. f8=Q Bxf8 80.
>Kxc7 Bg7 81. Kd6 Be5+ {0-1}) 71... Kd2 72. Bf3 Be6 73. Kg7 Bb3 74. g6 Bxa4 75.
>Kf7 Bxb5 76. Ke8 Bc4 77. f7 Bxf7+ 78. Kxf7 Bc3 79. Ke8 Ke3 80. Bd1 b5 81. Kd7
>Be5 82. Ke6 (82. g7 Bxg7 83. Kxc7 Be5+ 84. Kb6 (84. Kd7 a4 {0-1}) 84... a4 85.
>Kxb5 a3 86. Bb3 d2 {0-1}) 82... Kf4 {0-1}) 63... Kd4 64. g4 Be7 (64... Bf6 65.
>Bb3 (65. g5 Be5+ 66. Kg4 d5 67. g6 (67. Kh5 Kc3 68. Bb1 Kb3 69. f6 Kxa4 70. Bd3
>Kb4 71. f7 Bd6 72. Kh6 a4 73. g6 Be6 74. Bb1 Bxf7 75. gxf7 a3 76. Kg7 Kxb5 77.
>Kf6 Kxc6 {0-1}) 67... Bf6 68. Kf4 Kc3 69. Bd1 d4 70. Ke4 (70. g7 Bxg7 71. Kg5
>Be5 72. f6 Be6 73. Kg6 Bb3 74. f7 Bd6 {0-1}) 70... d3 71. Bg4 d2 72. Bd1 Kb2
>73. Bg4 Kc1 74. Kf4 d1=Q 75. Bxd1 Kxd1 {0-1}) 65... d5 66. Bc2 Be5+ 67. Kg5 Ke3
>68. Kg6 d4 69. Bd1 Kf4 70. f6 Bxg4 71. f7 Bd6 72. Bc2 Be2 73. Kg7 d3 74. Bb3 d2
>75. f8=Q+ Bxf8+ 76. Kxf8 d1=Q 77. Bxd1 Bxd1 78. Ke8 Bxa4 79. Kd7 Bxb5 80. Kxc7
>Bxc6 {0-1}) 65. g5 d5 66. Kg4 Kc3 67. Bd1 d4 68. Kf4 d3 69. f6 Bd6+ 70. Ke4 Be6
>71. g6 d2 72. Ke3 Be5 73. f7 Bg7 {0-1} *
Hi Kurt,
Interesting conclusion ... that was my conclusion too after a bit of analysis
of the lines presented here and some searching along various lines with my
program and yace.
The zugwang detection code in my program was broken - hence it did not see the
end coming soon enough.
Thanks to all who helped me debug this.
Regards
Mridul
PS : Dan , I assumed that programs were counting wood too - but the zugwangs
that come up here due to lack of material is the decsive factor - not the one
bishop advantage! (I mean only from the material point of view)
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