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Up Topic Rybka Support & Discussion / Rybka Discussion / Vas: Endgame Misevaluation
- - By billyraybar (***) [us] Date 2007-01-11 06:03 Edited 2007-01-11 06:17
This is probably a known issue, however I can't remember seeing this particular one. Rybka 2.2n2 mp gives over +3 evaluation here
1R6/1P5k/8/2K3P1/8/8/1r6/8 b - - 0 74
(Maybe if I had six piece egtbs the evaluation would be zero?). My opponet was rybka 2.1c and it gave the proper Zero evaluation, but he must have had 6 men egtbs. Most engines give about the same evaluation but fritz and crafty give a zero evaluation.  I posted the pgn if anyone is interested.

Billy

[Event "Rated game, 10m + 5s"]
[Site "Engine Room"]
[Date "2007.01.11"]
[Round "?"]
[White "Billyraybar, Rybka 2.2n2 mp t2"]
[Black "Jordiqui, Rybka 2.1c"]
[Result "1/2-1/2"]
[ECO "B22"]
[WhiteElo "2705"]
[BlackElo "2568"]
[Annotator "??;-0.01"]
[PlyCount "230"]
[EventDate "2007.01.11"]
[TimeControl "600+5"]

{Rybka 2.1c: 15.4 ply; 257kN/s Intel(R) Core(TM)2 CPU          6400  @ 2.13GHz
2133MHz, (2 threads)} 1. e4 {0} c5 {0.00/0 0} 2. c3 {0} Nf6 {0.00/0 0} 3. e5 {0
} Nd5 {0.00/0 0} 4. d4 {0} cxd4 {0.00/0 0} 5. Nf3 {0} e6 {0.00/0 0} 6. cxd4 {0}
d6 {0.00/0 0} 7. Bc4 {0} Nc6 {0.00/0 0} 8. O-O {0} Be7 {0.00/0 0} 9. Qe2 {0}
O-O {0.00/0 0} 10. Qe4 {0} Qc7 {0.00/0 0} 11. Re1 {0} Bd7 {0.00/0 0} 12. Na3 {
27} dxe5 {-0.01/14 35} 13. dxe5 {52} Ncb4 {-0.03/15 0} 14. Ng5 {0} g6 {
-0.03/14 18} 15. Bd2 {0} Rac8 {-0.03/14 31} 16. Rac1 {0} Qb6 {-0.06/13 20} 17.
Qh4 {0} h5 {-0.03/11 8} 18. Qe4 {0} Nc7 {-0.03/12 41} 19. Bf1 {29} Nxa2 {
0.05/15 20} 20. Ra1 {4} Bc6 {0.07/16 18} 21. Qb1 {18} Qd4 {0.24/16 3} 22. Nc4 {
4} Nb4 {0.26/16 16} 23. Rd1 {3} Qh4 {0.23/17 24} 24. g3 {10} Qg4 {0.17/16 0}
25. h3 {14} Qf5 {0.15/17 0} 26. Qxf5 {9} gxf5 {0.25/17 53} 27. Nd6 {16} Ra8 {
0.24/17 53} 28. Nxe6 {25} fxe6 {0.25/18 0} 29. Bxb4 {4} Nd5 {0.30/16 29} 30.
Bc5 {12} h4 {0.30/15 3} 31. b4 {63} hxg3 {0.30/13 14} 32. fxg3 {8} b6 {
0.37/15 3} 33. b5 {5} Be8 {0.43/15 22} 34. Bd4 {12} Bh5 {0.48/15 21} 35. Re1 {
21} f4 {0.58/16 26} 36. g4 {16} Bg6 {0.66/16 10} 37. Bc4 {11} Rfd8 {0.67/15 8}
38. Ra4 {13} Kf8 {0.68/16 39} 39. Bxd5 {55} exd5 {0.73/18 0} 40. Nf5 {18} Rdc8
{0.81/17 8} 41. Rea1 {9} Bc5 {0.81/17 10} 42. Bxc5+ {9} Rxc5 {0.85/18 12} 43.
Nd4 {17} Re8 {0.89/17 7} 44. Rf1 {16} Kg8 {0.93/17 2} 45. Rxa7 {8} Rxe5 {
1.00/17 20} 46. Rxf4 {5} Rc1+ {0.97/17 0} 47. Kg2 {48} Re3 {1.06/16 18} 48. Rf6
{24} Be4+ {0.83/18 0} 49. Kf2 {3} Rxh3 {0.97/18 0} 50. Rxb6 {22} Rc8 {1.10/18 0
} 51. g5 {7} Rd3 {1.17/17 45} 52. Ra4 {9} Rd2+ {1.13/17 18} 53. Kg3 {22} Re8 {
1.12/15 9} 54. Rba6 {22} Kh7 {1.14/17 0} 55. Rh6+ {15} Kg8 {1.17/14 4} 56. Ne6
{3} Bf5 {1.29/16 15} 57. Ra6 {5} d4 {1.38/16 21} 58. Rf6 {1} Bxe6 {1.38/17 5}
59. Rfxe6 {3} Rxe6 {1.39/13 48} 60. Rxe6 {0} Rb2 {1.40/14 14} 61. b6 {4} d3 {
1.42/14 4} 62. Kf3 {4} d2 {1.42/14 2} 63. Ke2 {9} Kf7 {1.42/18 0} 64. Rc6 {2}
Kg7 {1.42/19 6} 65. Rf6 {0} Kh8 {1.42/20 3} 66. Rf8+ {16} Kg7 {-0.03/24 8} 67.
Rb8 {2} Kf7 {-0.03/25 4} 68. b7 {3} d1=Q+ {-0.03/23 6} 69. Kxd1 {2} Kg7 {
0.00/1 0} 70. Kc1 {7} Rb3 {0.00/1 0} 71. Kc2 {3} Rb5 {0.00/1 0} 72. Kd3 {7} Kh7
{0.00/1 0} 73. Kc4 {6} Rb2 {0.00/1 0} 74. Kc5 {7} Rb1 {0.00/1 0} 75. Kc6 {3}
Rc1+ {0.00/1 0} 76. Kd6 {3} Rb1 {0.00/1 0} 77. Kc7 {5} Rc1+ {0.00/1 0} 78. Kb6
{3} Rb1+ {0.00/1 0} 79. Kc5 {2} Kg7 {0.00/1 0} 80. Kc6 {3} Rc1+ {0.00/1 0} 81.
Kd6 {2} Rb1 {0.00/1 0} 82. Ke7 {3} Rb6 {0.00/1 0} 83. Kd7 {3} Rb2 {0.00/1 0}
84. Kc7 {3} Rc2+ {0.00/1 0} 85. Kb6 {2} Rb2+ {0.00/1 0} 86. Ka6 {8} Ra2+ {
0.00/1 0} 87. Kb5 {5} Rb2+ {0.00/1 0} 88. Kc6 {4} Rc2+ {0.00/1 0} 89. Kd5 {4}
Rb2 {0.00/1 0} 90. Ke5 {4} Rb6 {0.00/1 0} 91. Kf4 {5} Rb5 {0.00/1 0} 92. Ke4 {3
} Kh7 {0.00/1 0} 93. Kd4 {3} Kg7 {0.00/1 0} 94. Kc4 {8} Rb1 {0.00/1 0} 95. g6 {
4} Rb2 {0.00/1 0} 96. Kd5 {2} Rb1 {0.00/1 0} 97. Kc6 {11} Rc1+ {0.00/1 0} 98.
Kb6 {7} Rb1+ {0.00/1 0} 99. Kc7 {2} Rc1+ {0.00/1 0} 100. Kd7 {2} Rb1 {0.00/1 0}
101. Kd6 {9} Rd1+ {0.00/1 0} 102. Ke5 {11} Re1+ {0.00/1 0} 103. Kd4 {50} Rb1 {
0.00/1 0} 104. Kd5 {2} Rb3 {0.00/1 0} 105. Kc6 {15} Rc3+ {0.00/1 0} 106. Kd6 {2
} Rd3+ {0.00/1 0} 107. Ke5 {3} Rb3 {0.00/1 0} 108. Ke6 {6} Rb5 {0.00/1 0} 109.
Ke7 {6} Rb4 {0.00/1 0} 110. Kd6 {3} Rb1 {0.00/1 0} 111. Kd7 {8} Rd1+ {0.00/1 0}
112. Ke6 {2} Rb1 {0.00/1 0} 113. Kf5 {2} Rb5+ {0.00/1 0} 114. Ke4 {3} Rb6 {
0.00/1 0} 115. Kd3 {20} Rb4 {Billyraybar,Rybka 2.2n2 mp t2 offers a draw  (Lag:
Av=0.50s, max=20.4s) 0.00/1 0} 1/2-1/2
Parent - By Vasik Rajlich (Silver) [hu] Date 2007-01-13 09:59
This is a very specialized endgame case. I really don't like to do anything (endgames included) on a position-by-position basis.

However, RYbka should at least give a slightly lower score, I can think of some general reasons for that.

Vas
Up Topic Rybka Support & Discussion / Rybka Discussion / Vas: Endgame Misevaluation

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