Rybka 2.3.2a does not see the close opposition without EGTB!

[Edward German]

Rybka 2.3.2a does not see the close opposition without EGTB!

(German: Rybka 2.3.2a sieht nicht dass die Nahopposition Remis ist)

I can not belive it but that is true!

PGN:

[Event "Wertungspartie, 3m + 0s"]
[Site "Maschinenraum"]
[Date "2007.07.29"]
[Round "?"]
[White "EduardNemeth, Rybka 1.2f 32-bit"]
[Black "Kriket, Rybka 2.3.2a mp"]
[Result "1/2-1/2"]
[ECO "B90"]
[WhiteElo "2357"]
[BlackElo "2798"]
[PlyCount "213"]
[EventDate "2007.07.29"]
[TimeControl "180"]

1. e4 {0} c5 {0} 2. Nf3 {0} d6 {0} 3. d4 {0} cxd4 {0} 4. Nxd4 {0} Nf6 {0} 5.
Nc3 {0} a6 {0} 6. Be3 {0} e5 {0} 7. Nb3 {0} Be6 {0} 8. f3 {0} Be7 {0} 9. Qd2 {0
} O-O {0} 10. O-O-O {0} Nbd7 {0} 11. g4 {0} b5 {0} 12. g5 {0} Nh5 {0} 13. Nd5 {
0} Bxd5 {0} 14. exd5 {0} f6 {0} 15. gxf6 {0} Bxf6 {0} 16. Na5 {0} Qe8 {0} 17.
Bh3 {0} Nf4 {0} 18. Bxf4 {0} exf4 {0} 19. Rhe1 {0} Ne5 {0.17/13 2} 20. Re4 {0}
Qh5 {0.23/14 5} 21. Be6+ {5} Kh8 {0.19/16 15} 22. Qe2 {0} Bd8 {0.13/16 5} 23.
Nc6 {0} Nc4 {0.09/15 9} 24. Nxd8 {0} Raxd8 {0.13/15 4} 25. Qf2 {0} Rde8 {
0.09/14 3} 26. h4 {0} Ne5 {0.09/14 2} 27. Rf1 {0} Rb8 {0.04/15 6} 28. Rg1 {0}
a5 {0.04/15 18} 29. Rg5 {0} Qxf3 {0.00/17 2} 30. Qxf3 {0} Nxf3 {0.00/18 0} 31.
Rg4 {0} g6 {0.00/17 1} 32. Rgxf4 {0} Ne5 {0.00/17 4} 33. Kd2 {0} Kg7 {
-0.03/16 6} 34. c3 {0} h6 {0.00/16 2} 35. Rxf8 {0} Rxf8 {-0.13/16 1} 36. Ke2 {0
} g5 {-0.14/16 1} 37. a4 {0} bxa4 {-0.09/17 2} 38. hxg5 {0} hxg5 {-0.07/17 0}
39. Rxa4 {0} Rb8 {-0.08/17 2} 40. b4 {4} axb4 {-0.12/18 1} 41. cxb4 {4} Kg6 {
-0.27/15 1} 42. Ke3 {5} Kh5 {-0.25/18 7} 43. Bf5 {3} g4 {-0.70/17 4} 44. Kf4 {7
} Rf8 {-0.81/17 1} 45. Ra7 {8} Ng6+ {-0.81/15 1} 46. Ke4 {2} Nh4 {-0.95/18 0}
47. Be6 {3} g3 {-0.83/17 1} 48. Rg7 {4} g2 {-0.97/20 0} 49. Bh3 {4} Re8+ {
-0.79/21 3} 50. Kd3 {4} Kh6 {-0.99/22 2} 51. Rg4 {2} Nf3 {-1.11/21 0} 52. Rxg2
{2} Ne1+ {-0.49/22 6} 53. Kd4 {4} Nxg2 {-1.13/20 1} 54. Bxg2 {1} Rb8 {
-1.13/25 1} 55. Kc4 {1} Kg5 {-1.13/25 0} 56. Bf3 {5} Kf6 {-1.13/25 1} 57. Bd1 {
2} Ke7 {-1.13/28 1} 58. Be2 {4} Rf8 {-1.13/27 0} 59. Bd1 {3} Rf4+ {-1.13/31 0}
60. Kc3 {2} Kd7 {-1.13/32 0} 61. Ba4+ {3} Kc7 {-1.13/33 0} 62. Bc2 {0} Kb6 {
-1.13/35 1} 63. Bg6 {4} Rf2 {-1.13/32 0} 64. Bd3 {3} Rf8 {-1.13/38 1} 65. Kc4 {
3} Rb8 {-1.13/36 0} 66. Kd4 {8} Ra8 {-1.13/40 0} 67. Kc3 {3} Ra3+ {-1.13/38 1}
68. Kd4 {2} Ra1 {-1.13/38 0} 69. Kc4 {2} Re1 {-1.13/40 0} 70. Kd4 {8} Rg1 {
-1.13/41 0} 71. Kc4 {2} Kc7 {-1.13/40 2} 72. Kd4 {1} Rg4+ {-1.13/39 0} 73. Kc3
{1} Kb6 {-1.13/39 1} 74. Bh7 {3} Kb5 {-2.42/19 1} 75. Bd3+ {1} Ka4 {-2.84/21 0}
76. Bc2+ {2} Ka3 {-3.22/24 0} 77. b5 {1} Rb4 {-3.23/25 0} 78. Bd3 {1} Ka4 {
-3.45/25 0} 79. Be2 {1} Ka5 {-3.63/20 0} 80. Bc4 {2} Rxb5 {-3.63/18 0} 81. Bxb5
{3} Kxb5 {-3.86/41 0} 82. Kd4 {0} Kb4 {-3.86/59 0} 83. Ke3 {0} Kc5 {
EduardNemeth,Rybka 1.2f 32-bit bietet Remis -3.86/59 0} 84. Ke4 {0} Kc4 {
-3.86/59 0} 85. Ke3 {0} Kxd5 {-3.86/59 0} 86. Kd3 {0} Ke5 {-3.86/59 0} 87. Ke3
{0} d5 {-3.86/59 0} 88. Kd3 {0} d4 {-3.86/59 0} 89. Kd2 {0} Ke4 {-3.86/59 0}
90. Ke2 {0} d3+ {-3.86/59 0} 91. Kd1 {0} Ke5 {-3.86/59 0} 92. Kc1 {0} Kd5 {
-3.86/59 0} 93. Kd1 {0} Kd4 {-3.86/59 0} 94. Kd2 {0} Kc4 {-3.86/59 0} 95. Kd1 {
0} Kc5 {-3.86/59 0} 96. Kc1 {0} Kb5 {0.00/59 0} 97. Kd2 {0} Kc4 {0.00/59 0} 98.
Kd1 {0} Kd5 {-3.86/59 0} 99. Kc1 {0} Kc5 {-3.86/59 0} 100. Kd1 {0} Kc4 {
-3.86/59 0} 101. Kd2 {0} Kd4 {-3.86/59 0} 102. Kd1 {0} Ke3 {-3.86/59 0} 103.
Ke1 {0} Kf4 {-3.86/59 0} 104. Kd2 {0} Ke4 {0.00/59 0} 105. Kd1 {0} Ke5 {
0.00/59 0} 106. Kc1 {0} Ke4 {0.00/59 0} 107. Kd1 {(Lag: Av=0.29s, max=1.1s) 0}
1/2-1/2

EduardNemeth,R - Kriket,R, Blitz:3'

[d]8/8/3p4/3k4/8/3K4/8/8 b - - 0 1

After move 86 white:

Rybka 2.3.2a MP 86. Kd3 {0} Ke5 {-3.86/59 0}

-3.86/59 ???

But Rybka 1.2f too can not see here the easy draw without EGTB:

Analysis by Rybka 1.2f 32-bit:

86...Ke5
³ (-0.35) Tiefe: 2 00:00:00
86...Ke5
³ (-0.63) Tiefe: 3 00:00:00
86...Ke5 87.Ke3
³ (-0.50) Tiefe: 4 00:00:00
86...Ke5 87.Ke3 d5
µ (-0.73) Tiefe: 5 00:00:00
86...Ke5 87.Ke3 d5 88.Kd3
³ (-0.67) Tiefe: 6 00:00:01 3kN
86...Ke5 87.Ke3 d5 88.Kd3 d4
³ (-0.53) Tiefe: 7 00:00:01 5kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4
µ (-0.91) Tiefe: 8 00:00:01 11kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4
µ (-0.90) Tiefe: 9 00:00:02 14kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+
³ (-0.67) Tiefe: 10 00:00:03 22kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Kd5 90.Kd3 Kc5 91.Kd2
³ (-0.67) Tiefe: 11 00:00:03 31kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Kd6 90.Ke2 Kc5 91.Kd3 Kd5
³ (-0.67) Tiefe: 12 00:00:04 40kN
86...Ke5 87.Ke3 Ke6 88.Kd2 d5 89.Ke3 Kd6 90.Kd4 Kc6 91.Kd3 Kc5 92.Kc3 d4+ 93.Kd3
³ (-0.60) Tiefe: 13 00:00:05 81kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+ 91.Kd2 Kd4 92.Kd1 Kc3
³ (-0.67) Tiefe: 14 00:00:06 118kN
86...Ke5 87.Ke3 d5 88.Kd3 Ke6 89.Kd4 Kd6 90.Kd3 Ke5 91.Ke3 d4+ 92.Kd3 Kd5 93.Kd2
³ (-0.55) Tiefe: 15 00:00:06 168kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+ 91.Kd2 Kd4 92.Kd1 Kd5 93.Kd2
³ (-0.67) Tiefe: 16 00:00:07 221kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+ 91.Kd2 Kd4 92.Kd1 Kd5 93.Kd2
³ (-0.69) Tiefe: 17 00:00:08 237kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+ 91.Kd2 Kd4 92.Kd1 Kd5 93.Ke1
µ (-0.87) Tiefe: 18 00:00:08 255kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+ 91.Kd2 Kd4 92.Kd1 Kd5 93.Kc1
µ (-0.90) Tiefe: 19 00:00:09 277kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+ 91.Kd2 Kd4 92.Kd1 Ke3 93.Ke1
³ (-0.67) Tiefe: 20 00:00:10 1661kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Kd5 90.Kd3 Kc5 91.Kd2 Kd6 92.Ke2 Ke6 93.Kd2
³ (-0.67) Tiefe: 21 00:00:11 2552kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+ 91.Kd2 Kd4 92.Kd1 Kc3 93.Kc1
³ (-0.67) Tiefe: 22 00:00:11 2706kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+ 91.Kd2 Kd4 92.Kd1 Ke3 93.Ke1
µ (-0.90) Tiefe: 23 00:00:12 2843kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+ 91.Kd2 Kd4 92.Kd1 Ke3 93.Ke1
³ (-0.67) Tiefe: 24 00:00:13 2870kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+ 91.Kd2 Kd4 92.Kd1 Ke3 93.Ke1
µ (-0.79) Tiefe: 25 00:00:14 3043kN
86...Ke5 87.Ke3 d5 88.Kd3 d4 89.Kd2 Ke4 90.Ke2 d3+ 91.Kd2 Kd4 92.Kd1 Ke3 93.Ke1
³ (-0.66) Tiefe: 26 00:00:43 3868kN

(Nemeth, privat 29.07.2007)

And that is the best Chess Program of the World?!

[hgm]

To be the best Chess program in the world, you only have to play the right move. What evaluation you assign to it doesn't matter.

So the question is if this strange evaluation does prevent Rybka to find the draw by Kd3 if it is playing white. That it is not evluating draws by 0.00 is logical. If it did it might give up the pawn (as black) without a fight. While it is not sure at all that white knows how to defend this. Black very nearly has a winning advantage here, and that should be expressed in the evaluation.

[mclane]

there is no best move. only a better one.
you can even win with a wrong move, that is weaker. important is that the move is not understood by the opponent, so it cannot defend against the idea.

e.g. if you opponent talks and talks and talks that long that you are confused,
he can beat you although his moves are weaker than yours.
i remember a few girl friends i had that were very famous in that strategy.

cstal uses similar strategy.

emanuel lasker also knew about it.