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Subject: Re: How to draw a won pawn endgame

Author: Christophe Drieu

Date: 12:52:53 05/13/03

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On May 13, 2003 at 15:18:22, Martin Giepmans wrote:

>
>From a game Ruffian - SpiderChess
>
>[D]8/7p/p2k4/1p4p1/4K1P1/P6P/8/8 b - - 0 50
>
>
>
>In this position SpiderChess played 50 .. Kc5? (it should have played
>Ke6 Kd4 a5 -+) and thought it was winning.
>
>The game continued:
>51. Kf5 Kc4 52. Kxg5 Kb3 53. Kh6 Kxa3 54. Kxh7 b4 55. h4 b3 56. g5 b2
>57. h5 b1=Q+ 58. g6 Qe4 59. h6 a5 60. Kg7 Qe7+ 61. Kh8 Qf8+ 62. Kh7 Qf5 63.
>Kg7 Kb3 64. h7 Qe5+ 65. Kg8 Qe8+ 66. Kg7 Qe7+ 67. Kg8 Qd8+ 68. Kg7 Qc7+ 69.
>Kg8 Qc8+ 70. Kg7 Qc3+ 71. Kg8 Qc4+ 72. Kg7 Qd4+ 73. Kg8 Qd5+ 74. Kg7 Qb7+
>75. Kg8 Qa8+ 76. Kg7 Qa7+ 77. Kg8 Qb6 78. Kg7 Kc2 79. h8=Q Qd4+ 80. Kg8
>Qd5+ 81. Kh7 Qh5+ 82. Kg7 Qe5+ 83. Kh7 Qh5+ 84. Kg7 Qe5+ 85. Kh7 Qh2+ 86.
>Kg8 Qb8+ 87. Kh7 Qh2+ 88. Kg7 Qc7+ 89. Kh6 Qf4+ 90. Kh7 Qh4+ 91. Kg7 Qe7+
>92. Kh6 Qe3+ 93. Kh7 Qh3+ 94. Kg8 Qb3+ 95. Kf8 Qb8+ 96. Kg7 Qb7+ 97. Kh6
>Qh1+ 98. Kg7 Qb7+ 99. Kh6 Qh1+ 100. Kg7 Qb7+ 101. Kh6 Qh1+ 102. Kg7 Qb7+
>{Drawn by repetition} 1/2-1/2.
>
>How do other engines fare?
>
>Martin

This is Tiger 15 analysis :

00:00:00.0	1,18	1	36	Ke6
00:00:00.0	1,18	2	63	Ke6 Kd4
00:00:00.0	1,08	3	164	Ke6 Kd4 h6
00:00:00.0	1,22	3	301	h6 Kd4 a5
00:00:00.0	1,22	4	396	h6 Kd4 a5 Kc3
00:00:00.0	1,30	4	587	a5 Kd4 b4 axb4 axb4
00:00:00.0	1,46	4	787	Kc5 Kd3 b4 a4
00:00:00.0	1,76	5	931	Kc5 Kd3 b4 a4 h6
00:00:00.0	1,56	6	1254	Kc5 Kd3 b4 a4 h6 a5
00:00:00.0	1,86	7	2082	Kc5 Kd3 b4 a4 h6 a5 Kd5
00:00:00.0	1,86	8	3637	Kc5 Kd3 b4 a4 h6 a5 Kd5 Kd2
00:00:00.1	2,02	9	5981	Kc5 Kd3 b4 a4 h6 a5 Kd5 Kd2 Kc4
00:00:00.1	2,28	10	14002	Kc5 Kd3 b4 a4 h6 Kd2 Kd4 Kc2 Kc4 Kb2
00:00:00.1	2,28	11	21618	Kc5 Kd3 b4 a4 h6 Kd2 Kd4 Kc2 Kc4 Kb2 b3
00:00:00.3	2,48	12	48462	Kc5 Kd3 a5 Kd2 a4 Kc3 b4+ axb4+ Kb5 Kd2 a3 Kc3 Ka4 Kc2
Kxb4
00:00:00.4	2,48	13	64294	Kc5 Kd3 a5 Kd2 a4 Kc3 b4+ axb4+ Kb5 Kd2 a3 Kc3 Ka4 Kc2
Kxb4
00:00:00.4	2,48	14	64602	Kc5 Kd3 a5 Kd2 a4 Kc3 b4+ axb4+ Kb5 Kd2 a3 Kc3 Ka4 Kc2
Kxb4
00:00:00.6	2,58	14	108735	a5 Kd4 h6 Kc3 Kc5 Kd3 a4 Kc3 b4+ axb4+ Kb5 Kc2 Kxb4
Kd2 a3 Kc2
00:00:01.0	2,96	15	184236	a5 Kd4 a4 Kd3 Kc5 Kc3 b4+ axb4+ Kb5 Kc2 Kxb4
00:00:01.8	2,97	16	320865	a5 Kd4 a4 Kd3 Kc5 Kc3 b4+ axb4+ Kb5 Kc2 Kxb4 Kb2 a3+
Ka2 Ka4 Ka1 Kb3
00:00:02.5	3,87	17	453948	a5 Kd4 a4 Kd3 Kc5 Kc3 b4+ axb4+ Kb5 Kc2 Kxb4 Kb2 a3+
Ka2 Ka4 Ka1 Kb3 Kb1 Kc4 Ka1
00:00:02.7	3,87	17	499788	a5 Kd4 a4 Kd3 Kc5 Kc3 b4+ axb4+ Kb5 Kb2 Kxb4
00:00:06.6	4,77	18	1190589	Kc5 Kd3 b4 Kd2 Kc4 axb4 Kxb4 Kc2 a5 Kb2 a4 Kc2 a3 Kb1
Kb3
00:00:08.0	3,66	18	1469557	Kc5 Kd3 a5 Kc3 a4 Kc2 Kc4 Kb2 Kd3 Kc1 Kc3 Kb1 Kb3 Kc1
Kxa3
00:00:10.1	4,56	19	1820709	Kc5 Kd3 a5 Kc3 a4 Kc2 Kc4 Kb2 b4 axb4 Kxb4 Kc2 a3 Kb1
Kb3
00:00:13.8	8,44	19	2320623	Kc5 Kd3 b4 Kd2 bxa3 Kc3 Kd5 Kb3 Ke4 Kxa3 Kf4 Ka4 Kg3
Ka5 Kxh3 Kxa6 Kxg4 Ka5 h5
00:00:21.1	9,34	20	3296697	Kc5 Kd3 b4 Kd2 bxa3 Kc3 Kd5 Kb3 Ke4 Kxa3 Kf4 Ka4 Kg3
Ka5 Kxh3 Kxa6 Kxg4 Ka5 h5
00:00:39.0	10,34	20	6146375	Kc5 Kd3 b4 axb4+ Kxb4 Ke4 a5 Kf5 a4 Kf6 a3 Kg7 a2
Kxh7 a1Q Kh6 Qc1 Kg6 Qd2
00:00:58.5	11,24	21	9302277	Kc5 Kd3 b4 axb4+ Kxb4 Ke4 a5 Kf5 a4 Kf6 a3 Kg7 h5
gxh5 g4 hxg4
00:01:13.3	11,32	21	12081689	Kc5 Kf5 a5 Kxg5 b4 axb4+ axb4 Kh6 b3 g5 Kd4 h4 b2
h5 b1Q Kg7 Qb7+ Kh6
00:01:56.1	11,48	21	18582128	a5 Kd4 a4 Kd3 Kc5 Kc3 b4+ Kb2 Kc4 axb4 Kxb4 Kc2 a3
Kb1 Kb3
00:02:37.0	11,50	22	25386546	a5 Kd4 a4 Kd3 Kc5 Kc3 b4+ Kb2 Kc4 axb4 Kxb4 Kc2 a3
Kb1 Kb3

Regards



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