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Subject: Rybka bug or weakness

Author: Vincent Lejeune

Date: 03:36:35 12/05/05


[d]8/4k3/2R5/4p3/4B1K1/5P2/1r6/8 w - - 0 73
Here Rybka played Kg3?, why not Kf5 to pick up the pawn ?
I suppose it's a bug...


[Event "3m + 0s, rated"]
[Site "?"]
[Date "2005.12.05"]
[Round "?"]
[White "]Vinvin[, Rybka 1.0 Beta 32-bi"]
[Black "Fernspiel, Fruit 2.2.1"]
[Result "1/2-1/2"]
[WhiteElo "2571"]
[BlackElo "2646"]
[PlyCount "229"]
[EventDate "2005.12.05"]
[EventType "blitz"]

1. c4 {0} e5 {0} 2. Nc3 {0} Nf6 {0} 3. Nf3 {0} Nc6 {0} 4. g3 {0} d5 {0} 5. cxd5
{0} Nxd5 {0} 6. Bg2 {0} Nb6 {0} 7. O-O {0} Be7 {0} 8. a3 {0} O-O {0} 9. d3 {0}
Be6 {0} 10. b4 {0} a5 {0} 11. b5 {0} Nd4 {0} 12. Nd2 {0} c6 {0} 13. bxc6 {0}
Nxc6 {0} 14. Rb1 {0} Rc8 {0} 15. Bb2 {0} Re8 {0} 16. Rc1 {-0.06/9 5} f6 {
-0.26/10 11} 17. Re1 {-0.11/10 8} f5 {-0.24/10 5} 18. Nf3 {0.01/10 6} Qd7 {
-0.18/10 7} 19. Qd2 {0.12/9 6} Bf6 {-0.01/11 10} 20. e4 {0.11/11 0} Kh8 {
0.15/11 9} 21. exf5 {0.40/10 3} Bxf5 {0.22/11 2} 22. Ne4 {0.49/9 0} Rcd8 {
0.25/11 12} 23. Nfg5 {0.59/9 3} Na4 {0.04/10 6} 24. Ba1 {0.58/11 0} Rf8 {
0.24/10 4} 25. Qc2 {0.51/10 4} Nd4 {0.04/11 4} 26. Qa2 {0.51/11 0} Bxe4 {
0.08/11 6} 27. Nxe4 {0.43/12 0} Be7 {0.06/12 5} 28. Bxd4 {0.30/11 1} Qxd4 {
0.06/11 4} 29. Rc4 {0.51/11 3} Qb2 {-0.08/12 5} 30. Re2 {0.65/12 3} Qb5 {
0.10/12 4} 31. Qc2 {0.77/12 1} Nb6 {0.30/12 2} 32. a4 {0.80/12 0} Qe8 {
0.32/12 3} 33. Rc7 {0.91/10 2} Nxa4 {0.37/11 0} 34. Rxe7 {1.17/10 1} Qxe7 {
0.52/11 1} 35. Qxa4 {1.22/11 0} Qc7 {0.55/12 4} 36. Qb3 {1.56/10 5} Rc8 {
0.64/10 4} 37. Bh3 {1.87/10 4} Rcd8 {1.05/11 4} 38. Rc2 {2.09/10 4} Qf7 {
1.16/13 0} 39. Be6 {2.17/10 5} Qh5 {0.79/10 4} 40. Rc1 {2.28/11 0} a4 {
1.00/10 2} 41. Qxa4 {2.10/11 0} Rxd3 {1.27/11 3} 42. Re1 {2.24/10 4} Rdd8 {
1.30/12 0} 43. Qb3 {2.53/10 3} Qg6 {1.31/11 2} 44. Bd5 {2.53/10 0} b6 {
1.21/10 2} 45. Rc1 {2.57/9 1} Qh5 {1.16/10 2} 46. Kg2 {2.63/10 5} Qe2 {
1.38/10 3} 47. Rc6 {2.65/11 0} b5 {1.52/11 1} 48. Rc3 {2.81/11 2} g5 {1.63/11 0
} 49. h3 {3.40/10 3} g4 {2.13/10 3} 50. hxg4 {3.50/9 1} Qxg4 {2.13/10 1} 51.
Qxb5 {3.47/9 0} Qg7 {2.25/10 2} 52. Rc6 {3.65/9 2} Rb8 {2.38/11 0} 53. Qc5 {
4.04/10 3} Qg4 {3.08/10 1} 54. Nd6 {4.88/9 3} Qd4 {3.44/10 2} 55. Nf7+ {
5.13/9 1} Rxf7 {4.19/12 2} 56. Bxf7 {4.63/11 1} Qxc5 {4.40/12 2} 57. Rxc5 {
4.47/12 0} Kg7 {4.52/13 1} 58. Rc7 {4.83/11 3} Kf6 {4.42/12 2} 59. Bd5 {
4.89/11 3} Rb4 {4.48/13 1} 60. Rf7+ {4.89/9 3} Kg6 {4.60/14 1} 61. Ra7 {
4.83/9 2} h5 {4.06/11 1} 62. Ra6+ {4.83/9 1} Kg5 {4.23/13 1} 63. f3 {5.12/12 2}
h4 {4.34/15 0} 64. Be4 {5.15/11 0} hxg3 {4.47/13 1} 65. Kxg3 {5.13/13 0} Rb5 {
4.55/12 1} 66. Rg6+ {5.18/12 2} Kh5 {4.65/15 0} 67. Rf6 {5.16/14 2} Rb3 {
4.69/15 0} 68. Rf5+ {5.16/13 2} Kg6 {4.68/15 0} 69. Kg4 {5.15/14 2} Rb2 {
4.72/15 0} 70. Rf8+ {5.15/13 1} Kg7 {4.64/15 1} 71. Rc8 {5.14/14 2} Kf6 {
4.77/14 1} 72. Rc6+ {5.13/13 1} Ke7 {4.83/16 0} 73. Kg3 {5.11/13 4} Rd2 {
3.63/11 1} 74. Rc7+ {5.11/14 2} Kd6 {3.63/12 1} 75. Rc8 {5.12/14 1} Kd7 {
4.03/12 0} 76. Rc1 {5.11/13 1} Ke7 {4.12/13 1} 77. Rc6 {5.11/13 2} Rd8 {
4.27/13 1} 78. Kf2 {5.14/13 2} Kf7 {3.81/11 1} 79. Ke3 {5.15/12 1} Rd1 {
4.27/12 0} 80. Rb6 {5.15/11 1} Ke7 {4.22/11 1} 81. Rh6 {5.15/13 0} Re1+ {
4.08/12 1} 82. Kd2 {5.19/12 1} Rg1 {4.14/12 1} 83. Kc3 {5.16/12 2} Rd1 {
3.63/10 0} 84. Rh2 {5.16/11 0} Kf6 {3.54/10 1} 85. Rg2 {5.16/12 1} Rd4 {
3.58/11 1} 86. Rg6+ {5.16/13 0} Ke7 {3.62/12 0} 87. Kb3 {5.16/13 0} Kf7 {
3.59/12 0} 88. Ra6 {5.16/14 1} Ke7 {3.69/15 0} 89. Ra1 {5.16/14 1} Kf6 {
3.56/11 1} 90. Rg1 {5.16/14 1} Ke7 {3.65/13 1} 91. Rg2 {5.16/14 0} Kf6 {
3.61/12 1} 92. Rg4 {5.16/16 9} Rd2 {3.68/13 1} 93. Kb4 {5.16/13 1} Rd4+ {
3.68/11 0} 94. Kc5 {5.16/13 1} Rd1 {3.73/12 1} 95. Rg6+ {5.16/10 1} Ke7 {
3.70/13 0} 96. Rh6 {5.16/11 1} Ra1 {3.69/12 0} 97. Kb5 {5.17/10 1} Rd1 {
3.68/11 0} 98. Kc4 {5.16/12 1} Rd4+ {3.75/14 0} 99. Kc5 {5.16/15 0} Rd1 {
4.09/13 0} 100. Rg6 {5.16/12 1} Ra1 {3.79/12 0} 101. Kb5 {5.16/11 1} Rd1 {
3.69/12 0} 102. Rh6 {5.16/14 0} Rc1 {3.69/11 1} 103. Ra6 {5.16/14 0} Kf7 {
3.75/13 0} 104. Kb4 {5.16/11 0} Ke7 {3.75/11 0} 105. Rh6 {5.16/13 0} Rd1 {
3.68/11 0} 106. Rc6 {5.16/12 1} Rd4+ {3.96/11 0} 107. Kb5 {5.16/10 0} Rd1 {
3.79/11 0} 108. Rc2 {5.16/11 1} Rb1+ {3.55/10 0} 109. Kc4 {5.16/12 0} Kf6 {
3.55/11 0} 110. Rg2 {5.12/10 1} Rc1+ {3.06/9 0} 111. Kd3 {5.12/9 1} Rd1+ {
0.45/13 0} 112. Ke2 {5.04/8 0} Ra1 {0.43/14 0} 113. Rg6+ {4.90/7 0} Kf7 {
0.36/11 0} 114. Rb6 {4.93/8 0} Ra2+ {0.00/13 0} 115. Bc2 {
(Lag: Av=0.22s, max=0.7s) 0.41/12 0} 1/2-1/2




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