Author: Andreas Guettinger
Date: 15:26:02 01/13/06
Go up one level in this thread
On January 13, 2006 at 18:01:40, Dan Andersson wrote:
>On January 13, 2006 at 17:24:07, Andreas Guettinger wrote:
>
>>Interesting game that occured between Yace PB and Rybka 1.0 beta 32bit. After a
>>sac and nice play from Rybka I had the impression black should win this. But the
>>endgame turned out to be difficult for Rybka and despite the black pawn on the
>>second row the game ended in a draw. Did black go wrong? Or probably it was not
>>more than a draw?
>>
> There is a well known fortress strategy when the rook is locked in by the pawn
>and the opponent king can occupy the rook or knight file on the second row.
> I'm uncertain where black makes the final mistake. But one winning try off the
>top of my head is:
>36... Kf7 37. Ra8 Rb4 38. c5 Ke6 39. Kg2 Kd7 40. Ra5 Kc6 41. Kg3 b5 42. cxb6ep
>Kxb6 43. Ra8 Kb5 44. Kg4 Kc4 45. Kxg5 Kb3 46. Kg6 a3 47. Kxg7 Ra4 48. Rc8 Kb2
>49. Rd8 Kc2 50. Rc8+ Kd2 51. Rd8+ Ke2 52. Rc8 a2
> Feel free to check it for errors.
>
Interesting. Probably Rybka doesn't know about this strategy, because it
evaluates the position with scores of more than +4 for black. Other engines give
much lower scores. But probably don't find the win either.
- Andy
>MvH Dan Andersson
>>
>>[D] 2R5/8/6p1/4p1p1/4P3/5P1P/pk4K1/r7 w - - 6 51
>>
>>Athlon64 3400+
>>Time 60' + 10
>>
>>
>>[Event "Computer chess game"]
>>[Site "belugabox"]
>>[Date "2006.01.10"]
>>[Round "1"]
>>[White "Yace Paderborn"]
>>[Black "Rybka v1.0 beta"]
>>[Result "1/2-1/2"]
>>[TimeControl "3600+10"]
>>
>>1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 d6 6. Bb3 a6 7. Nbd2 Ba7 8.
>>h3 Ne7 9. Nf1 Ng6 10. Ng3 O-O 11. O-O Be6 12. Bg5 h6 13. Bxe6 fxe6 14. Bd2
>>d5 15. c4 dxc4 16. dxc4 Nd7 17. Bc3 Qe7 18. Kh2 Rad8 19. Qc2 Rxf3 20. gxf3
>>Qh4 21. Bd2 Nc5 22. Be3 Nd3 23. Ne2 Ndf4 24. Nxf4 Nxf4 25. Bxf4 Qxf4+ 26.
>>Kg2 Rd2 27. Qc1 Qg5+ 28. Kh1 Bxf2 29. Rxf2 Rxf2 30. Qxg5 hxg5 31. Rd1 Rxb2
>>32. Rd7 Rxa2 33. Rxc7 Rb2 34. Re7 a5 35. Rxe6 a4 36. Re8+ Kh7 37. Ra8 Ra2
>>38. Kg1 a3 39. Kf1 Ra1+ 40. Kg2 Kg6 41. Ra7 a2 42. c5 Kf6 43. Kh2 Ke6 44.
>>Kg2 Kd7 45. Rxb7+ Kc6 46. Ra7 Kxc5 47. Kh2 g6 48. Kg2 Kc4 49. Ra8 Kc3 50.
>>Rc8+ Kb2 51. Rb8+ Ka3 52. Ra8+ Kb4 53. Rb8+ Kc5 54. Ra8 Kc4 55. Ra3 Kb4 56.
>>Ra8 Kb3 57. Rb8+ Kc2 58. Rc8+ Kd2 59. Rd8+ Ke2 60. Ra8 Kd3 61. Ra4 Kc3 62.
>>Ra6 Kd2 63. Ra3 Kc2 64. Ra6 Kc1 65. Ra8 g4 66. hxg4 Kb2 67. Rb8+ Kc3 68.
>>Rc8+ Kd2 69. Ra8 g5 70. Rd8+ Ke2 71. Ra8 Kd3 72. Ra4 Kc3 73. Ra8 Kc4 74.
>>Rc8+ Kd4 75. Rd8+ Kc5 76. Rc8+ Kb4 77. Ra8 Kc3 78. Ra7 Kc2 79. Rc7+ Kd2 80.
>>Rd7+ Ke2 81. Ra7 Ke3 82. Ra3+ Kd4 83. Ra5 Kc4 84. Ra8 Kb3 85. Rb8+ Kc2 86.
>>Rc8+ Kb2 87. Rb8+ Ka3 88. Ra8+ Kb4 89. Ra7 Kb3 90. Rb7+ Ka4 91. Ra7+ Kb5
>>92. Ra3 Kc5 93. Ra5+ Kc6 94. Ra6+ Kd7 95. Ra8 Ke6 96. Ra7 Kf6 97. Ra6+ Ke7
>>98. Ra7+ Kd6 99. Ra5 Kc7 100. Ra7+ Kc8 101. Ra8+ Kd7 102. Ra7+ Ke6 103.
>>Ra6+ Kf7 104. Ra7+ Kg6 105. Ra6+ Kg7 106. Ra7+ Kh6 107. Ra6+ Kh7 108. Ra7+
>>Kg8 109. Ra6 Kf8 110. Ra5 Kg8 111. Ra7 Kf8 112. Ra8+ Ke7 113. Ra7+ Kd8 114.
>>Kh2 Kc8 115. Kg2 Kb8 116. Ra5 Kb7 117. Ra3 Kb6 118. Ra8 Kb5 119. Rb8+ Kc6
>>{Draw by fifty-move rule} 1/2-1/2
>>
>>regards
>>Andy
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