Author: Dieter Buerssner
Date: 14:31:29 05/13/03
Go up one level in this thread
On May 13, 2003 at 15:55:00, Tim Foden wrote: >On May 13, 2003 at 15:18:22, Martin Giepmans wrote: > >> >>From a game Ruffian - SpiderChess >> >>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 >I'm not convinced that Kc5 is so bad. It looks to me that 52... Kb3 was more >likely the wrong move. It looks to me (with brief computer assisted analysis) >like it should have been 52... a5. I thought the same. Actually, Yace can show a mate score after 52...a5 (with the help of some backward analysis). I tried Kb3 as well. The score stayed around +8, and Yace did not seem to make progress. I thought, just try to do the suggested moves in Analyse mode fast. I expected a draw score sooner or later. To my surprise, black won. The game went already through repetitions. When I go back from the end position, I get a score of +14 after Kb3. I am aware, that with advanced pawn vs Q the engine score can be very wrong. But +14 seems rather convincing. So, the error was probably even later. [Event "Computer chess game 60 600 +0 20 200"] [Site "?"] [Date "2003.05.13"] [Round "1"] [White "?"] [Black "Yace 0.99.81"] [Result "*"] [SetUp "1"] [FEN "8/7p/p2k4/1p4p1/4K1P1/P6P/8/8 b - - 0 50"] 50...Kc5 51. Kf5 Kc4 52. Kxg5 Kb3 53. Kh6 Kxa3 54. Kxh7 b4 55. h4 b3 56. g5 a5 57. g6 b2 58. h5 a4 59. g7 b1=Q+ 60. Kh6 Qc1+ 61. Kh7 Qc2+ 62. Kh6 Qc6+ 63. Kh7 Qc2+ 64. Kh6 Qc6+ 65. Kh7 Qe4+ 66. Kh6 Qe6+ 67. Kh7 Qe4+ 68. Kh6 Qf4+ 69. Kh7 Qc7 70. Kh6 Qd6+ 71. Kh7 Qd3+ 72. Kh6 Qd6+ 73. Kh7 Qe7 74. Kh6 Qf6+ 75. Kh7 Qf7 76. h6 Kb4 77. Kh8 Qh5 78. Kh7 Qf7 79. Kh8 Qh5 80. Kh7 Qf5+ 81. Kh8 Qe6 82. Kh7 Qe4+ 83. Kh8 Qg6 84. h7 Qf6 85. Kg8 a3 86. h8=Q a2 87. Kh7 Qh4+ 88. Kg6 Qe4+ 89. Kh6 Qh1+ 90. Kg6 Qg2+ 91. Kf7 Qb7+ * Regards, Dieter
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