Why did Rybka lose?

[kingliveson]

Ponder on game: Move 157 ??

[Event "IvanHoe vs Rybka, Blitz 5m+3s"]
[Site "W0111D0001"]
[Date "2010.10.30"]
[Round "3"]
[White "IvanHoe 9.50b x64"]
[Black "Deep Rybka 4 SSE42 x64"]
[Result "1-0"]
[ECO "B12"]
[Annotator "0.32;0.21"]
[PlyCount "369"]
[TimeControl "300+3"]

{AMD Phenom(tm) II X4 940 Processor 3010 MHz W=23.9 plies; 3,569kN/s; 9,768,
614 TBAs B=20.1 plies; 206kN/s; 280 TBAs} 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nf3
e6 {Both last book move} 5. Nc3 {0.32/19 20} Bb4 {0.21/18 21} 6. Bd3 {0.29/22 0
} Ne7 {0.20/18 14} 7. O-O {0.29/22 0} Nd7 {0.19/17 16 (Bxd3)} 8. Ne2 {0.30/20
11} O-O {0.20/17 0} 9. c3 {0.30/21 32} Ba5 {0.18/18 0} 10. Bg5 {0.30/20 6 (h3)}
Bxd3 {0.13/17 23} 11. Qxd3 {0.26/20 0} h6 {0.13/17 10} 12. Bxe7 {0.27/19 0}
Qxe7 {0.11/17 25} 13. h3 {0.21/20 0 (Qe3)} c5 {0.08/16 41 (Rfc8)} 14. Rfc1 {0.
19/20 37 (Rfd1)} Rfc8 {0.06/15 18 (Bb6)} 15. Rc2 {0.15/19 22 (Qe3)} c4 {-0.07/
18 21 (Bb6)} 16. Qd1 {0.06/20 17 (Qd2)} b5 {-0.08/18 17 (Bc7)} 17. b4 {0.05/20
21 (Rcc1)} Bd8 {-0.15/18 13} 18. a4 {0.02/23 0} a5 {-0.20/19 10} 19. Rb2 {0.00/
24 0} bxa4 {-0.19/20 20 (axb4)} 20. Rxa4 {0.00/21 10} axb4 {-0.19/21 0} 21.
Rbxb4 {0.00/22 11 (Raxb4)} Nb6 {-0.21/19 13} 22. Rxa8 {0.00/24 0} Rxa8 {-0.22/
21 15} 23. Qb1 {-0.05/24 0} Qa7 {-0.22/20 6} 24. Qc1 {-0.05/22 0} Qb7 {-0.24/
20 17 (Nd7)} 25. Qb2 {-0.07/24 25 (Qb1)} Ra6 {-0.28/20 12} 26. Ne1 {-0.09/25 0
(g3)} Qa8 {-0.28/20 19 (Qa7)} 27. Nc2 {-0.20/23 13} Ra4 {-0.18/18 4} 28. Kf1 {
-0.05/23 7} Ra2 {-0.20/18 0 (Rxb4)} 29. Qb1 {0.00/23 11} Ra7 {-0.17/19 0 (Nd7)}
30. Kg1 {0.00/23 16 (g3)} Bc7 {-0.19/18 17 (Qc6)} 31. g3 {0.00/21 12} Nc8 {-0.
21/18 2} 32. Rb5 {0.00/22 3 (Rb2)} Ne7 {-0.21/18 13} 33. Kg2 {0.00/23 0 (Rb2)}
Nc6 {-0.31/14 7} 34. Nc1 {-0.04/21 6 (Rc5)} h5 {-0.31/16 15} 35. h4 {-0.04/21 0
} g6 {-0.31/16 7 (f6)} 36. Kh2 {0.00/21 11 (Kg1)} Kg7 {-0.31/16 4 (Na5)} 37.
Kg2 {0.00/20 4 (Ne2)} Kh7 {-0.31/13 3 (Kg8)} 38. f3 {0.00/21 9 (Kg1)} Kg7 {-0.
31/16 4} 39. Ne2 {0.00/20 0} Na5 {-0.31/15 3} 40. Nc1 {0.00/21 0} Qf8 {-0.29/
15 3 (Nc6)} 41. Rb2 {-0.07/20 22 (Ne3)} Qe8 {-0.24/15 5 (Qe7)} 42. Na3 {0.00/
21 14 (Nb4)} Ra6 {-0.14/14 3 (Nb3)} 43. Nb5 {0.00/21 6} Bb8 {-0.08/17 0 (Qc6)}
44. Ra2 {0.00/22 7} Qc6 {-0.12/18 0} 45. Ra1 {-0.04/22 21 (Qb2)} Qb7 {-0.29/19
8} 46. Qb2 {-0.05/24 0} Nc6 {-0.29/19 5} 47. Rxa6 {-0.06/24 0} Qxa6 {-0.29/19 4
} 48. Na3 {-0.06/24 0} Qa4 {-0.29/18 4} 49. Nc2 {-0.07/23 4} Bc7 {-0.32/19 0}
50. Ne3 {-0.10/22 14} Na7 {-0.35/19 0} 51. Qd2 {-0.18/23 6} Nb5 {-0.41/19 0}
52. Ne2 {-0.12/23 5} Qb3 {-0.41/19 0} 53. Nd1 {-0.20/23 14} Bd8 {-0.41/21 0}
54. Kf1 {-0.21/23 7 (Kf2)} Qb1 {-0.43/19 5 (Ba5)} 55. Kf2 {-0.22/23 4} Ba5 {-0.
43/18 0} 56. Ke3 {-0.37/22 9 (Nb2)} Bb6 {-0.54/18 7} 57. Nb2 {-0.38/23 0 (f4)}
Qf5 {-0.54/17 6} 58. f4 {-0.37/23 0} Ba5 {-0.54/18 7 (Qb1)} 59. Kf2 {-0.37/22 3
} Qe4 {-0.54/18 1 (Qb1)} 60. Nd1 {-0.37/23 7} Qb1 {-0.54/19 0} 61. Ke3 {-0.37/
22 2} Kf8 {-0.54/19 2 (Qb3)} 62. Kf2 {-0.37/24 6 (Nf2)} Ke7 {-0.54/17 5 (Kg8)}
63. Nb2 {-0.37/22 5 (Ke3)} Qa2 {-0.54/18 5} 64. Kf3 {-0.37/23 0 (Ke3)} Kf8 {-0.
54/18 5} 65. Ke3 {-0.37/23 0} Qb1 {-0.54/19 6 (Bb6)} 66. Nd1 {-0.37/22 4} Kg7 {
-0.52/18 0 (Kg8)} 67. Kf2 {-0.37/22 3} Kg8 {-0.54/18 1} 68. Ke3 {-0.37/24 10}
Kh7 {-0.52/19 0} 69. Kf2 {-0.37/23 6} Kh8 {-0.52/20 0 (Qb3)} 70. Ke3 {-0.37/23
6} Kg8 {-0.50/19 2} 71. Kf2 {-0.37/22 1} Kh7 {-0.50/18 5 (Qb3)} 72. Ke3 {-0.37/
22 4} Kh8 {-0.50/17 3 (Qb3)} 73. Kf2 {-0.22/18 2} f5 {-0.50/18 2 (Bd8)} 74. Ke3
{-0.21/21 3} Kg7 {-0.50/19 1 (Kg8)} 75. Kf2 {-0.21/23 5 (Nf2)} Kg8 {-0.50/20 6
(Kf7)} 76. Ke3 {-0.21/23 4 (Ne3)} Kf7 {-0.50/19 4} 77. Kf2 {-0.21/24 0 (Nf2)}
Ke7 {-0.50/20 5} 78. Ke3 {-0.21/24 0 (Nb2)} Kf8 {-0.50/20 7} 79. Kf2 {-0.21/26
0 (Nf2)} Kf7 {-0.50/20 5 (Qb3)} 80. Ke3 {-0.21/24 7 (Ne3)} Ke7 {-0.50/19 4
(Qb3)} 81. Nf2 {-0.21/23 4} Kf8 {-0.50/20 0 (Qb3)} 82. Nd1 {-0.21/24 4} Ke8 {
-0.50/20 0 (Qb3)} 83. Kf2 {-0.21/23 3 (Nf2)} Kd7 {-0.50/20 5} 84. Ke3 {-0.21/
24 0} Kc6 {-0.50/20 6 (Qb3)} 85. Kf2 {-0.21/22 2 (Nf2)} Kb7 {-0.50/20 4 (Kc7)}
86. Kg2 {-0.21/23 4 (Ke3)} Kc7 {-0.50/17 3} 87. Kf2 {-0.21/24 3 (Nf2)} Kc6 {-0.
50/19 3} 88. Ke3 {-0.21/24 0} Kb6 {-0.50/19 4 (Kd7)} 89. Kf2 {-0.21/24 3 (Nb2)}
Kc7 {-0.50/18 2 (Qb3)} 90. Ke3 {-0.21/24 4} Kc8 {-0.50/21 0 (Kd7)} 91. Kf2 {-0.
21/24 2 (Nf2)} Kd8 {-0.43/21 6 (Qb3)} 92. Kg2 {-0.21/22 2 (Ke3)} Ke7 {-0.43/18
2} 93. Kf2 {-0.21/23 0} Qb3 {-0.43/20 3 (Bb6)} 94. Nc1 {-0.21/24 2 (Kf3)} Qa3 {
-0.43/20 3} 95. Ne2 {-0.21/26 0} Kf7 {-0.43/21 3 (Qa4)} 96. Qc2 {-0.21/23 4}
Kg7 {-0.43/20 0} 97. Qb1 {-0.21/24 5 (Kf3)} Qa4 {-0.43/20 6} 98. Kg2 {-0.21/25
0 (Ke3)} Kf7 {-0.43/19 4 (Bb6)} 99. Kf2 {-0.21/23 5 (Kf3)} Ke7 {-0.43/18 2
(Bd8)} 100. Kf3 {-0.21/21 2 (Qc1)} Bd8 {-0.43/19 4 (Bb6)} 101. Ne3 {-0.21/22 3}
Bb6 {-0.43/19 0 (Qb3)} 102. Qc1 {-0.21/23 4} Ba5 {-0.43/21 0} 103. Qd2 {-0.21/
23 3 (Nd1)} Qb3 {-0.43/20 3 (Qa3)} 104. Nd1 {-0.21/24 2} Kf7 {-0.43/21 2} 105.
Qc1 {-0.21/25 3} Qa2 {-0.43/21 1 (Bb6)} 106. Kf2 {-0.21/25 6 (Ke3)} Kg7 {-0.43/
20 4} 107. Kf3 {-0.21/26 0 (Ke3)} Kh6 {-0.43/19 4 (Kg8)} 108. Nf2 {-0.21/23 4}
Qa4 {-0.43/18 0 (Bd8)} 109. Nd1 {-0.21/23 7 (Qb2)} Kg7 {-0.42/18 7} 110. Qd2 {
-0.21/25 0 (Qb1)} Qb3 {-0.43/20 4} 111. Kf2 {-0.21/25 0 (Qc1)} Kh6 {-0.43/19 3
(Qa3)} 112. Kf3 {-0.21/24 3 (Qc1)} Kh7 {-0.43/18 3 (Qb1)} 113. Qc1 {-0.21/24 4}
Qa2 {-0.43/21 0} 114. Ke3 {-0.21/25 11} Kg8 {-0.43/21 0} 115. Kf3 {-0.21/25 9}
Kg7 {-0.43/22 0} 116. Kf2 {-0.16/23 7} Kh6 {-0.43/21 9} 117. Kf3 {0.00/25 0}
Na3 {-0.04/18 9 (Kg7)} 118. Kf2 {0.00/25 4 (Qb2)} Kg7 {-0.05/17 2 (Nb5)} 119.
Qb2 {0.00/26 5} Qxb2 {-0.30/24 0 (Qb3)} 120. Nxb2 {0.00/28 3} Nb1 {-0.30/27 1}
121. Na4 {0.00/29 1 (Nd1)} Nd2 {-0.37/25 4} 122. Nc5 {0.00/30 0 (Ke3)} Ne4+ {
-0.37/26 5 (Kf7)} 123. Nxe4 {0.00/28 4} dxe4 {-0.37/28 0} 124. Ke3 {0.00/29 2}
Kf8 {-0.37/26 2 (Kf7)} 125. Kd2 {0.00/28 2} Ke7 {-0.37/24 2} 126. Ke3 {0.00/30
0 (Nc1)} Kd7 {-0.37/28 5} 127. Kd2 {0.00/30 0} Kc6 {-0.37/28 6 (Ke7)} 128. Ke3
{0.00/30 3} Kd5 {-0.37/28 1 (Kd7)} 129. Kd2 {0.00/32 5} Bc7 {-0.37/27 0 (Kc6)}
130. Ke3 {0.00/29 5} Kc6 {-0.37/28 0 (Ba5)} 131. Ng1 {0.00/28 2 (Kd2)} Kb5 {-0.
37/25 4 (Kd5)} 132. Kd2 {0.00/28 3} Ba5 {-0.37/25 0} 133. Ne2 {0.00/29 2} Kb6 {
-0.37/26 6 (Kc6)} 134. Ke3 {0.00/28 4} Ka6 {-0.37/25 0 (Kc6)} 135. Kf2 {0.00/
26 4} Bb6 {-0.37/27 0 (Kb5)} 136. Ke3 {0.00/29 4} Kb5 {-0.37/27 0 (Ba5)} 137.
Kd2 {0.00/28 3 (Nc1)} Ba5 {-0.37/26 9 (Kc6)} 138. Ke3 {0.00/27 3} Kb6 {-0.37/
26 1 (Kc6)} 139. Kf2 {0.00/27 3} Kc7 {-0.37/28 1 (Kc6)} 140. Ke3 {0.00/30 3}
Kc6 {-0.37/28 1 (Kd7)} 141. Kd2 {0.00/29 2 (Kf2)} Kd5 {-0.37/28 6 (Kd7)} 142.
Ke3 {0.00/30 2} Bd8 {-0.37/29 2 (Kc6)} 143. Nc1 {0.00/27 2 (Kf2)} Be7 {-0.37/
25 6 (Ba5)} 144. Ne2 {0.00/30 9 (Na2)} Bf8 {-0.37/29 5 (Bd8)} 145. Nc1 {0.00/
32 2 (Kf2)} Ba3 {-0.37/25 8 (Be7)} 146. Ne2 {0.00/30 2} Kc6 {-0.37/28 2 (Bf8)}
147. Kd2 {0.00/28 2} Be7 {-0.37/26 5 (Bb2)} 148. Ke3 {0.00/30 4 (Nc1)} Bf8 {-0.
37/28 6 (Kd5)} 149. Ng1 {0.00/29 3 (Kd2)} Ba3 {0.00/24 3 (Kd5)} 150. Kd2 {0.00/
30 6} Kd5 {-0.37/26 0 (Bb2)} 151. Ne2 {0.00/31 6} Kc6 {0.00/27 0 (Bb2)} 152.
Ng1 {0.00/30 2} Kc7 {0.00/26 4 (Bb2)} 153. Nh3 {0.00/28 4} Bb2 {0.00/27 0} 154.
Kc2 {0.00/28 4} Ba3 {0.00/26 0} 155. Ng5 {0.00/28 3 (Kd2)} Kd7 {0.00/27 4} 156.
Kd2 {0.00/29 0} Bb2 {0.00/27 8} 157. Kc2 {0.00/28 0} Ba1 {0.00/26 4 (Ba3)} 158.
Nh3 {2.31/23 6 (Kd2)} Kc7 {2.86/16 4} 159. Ng1 {3.03/24 0} Kc6 {2.87/20 5} 160.
Ne2 {3.41/25 0} Kd5 {2.87/21 4} 161. Kc1 {3.49/25 0 (Kb1)} Bxc3 {2.94/20 5}
162. Nxc3+ {3.49/25 0} Kxd4 {2.94/20 4} 163. Kd2 {3.49/26 0} Kc5 {5.76/18 4}
164. Ne2 {3.65/25 0} Kc6 {5.76/18 2 (Kd5)} 165. Nd4+ {5.98/20 6 (Kc3)} Kd5 {5.
76/21 4 (Kd7)} 166. Kc3 {7.13/20 3} e3 {5.76/17 0} 167. Nf3 {7.13/21 2} e2 {10.
52/18 1 (Kc5)} 168. Kd2 {8.02/21 2} Kc6 {10.52/20 1 (e1R)} 169. Kxe2 {8.28/23 2
} Kd7 {10.59/21 1 (c3)} 170. Kd2 {12.24/25 11} Kc6 {13.42/17 0 (Ke8)} 171. Nd4+
{15.37/19 9} Kd5 {13.42/16 0 (Kc7)} 172. Kc3 {18.85/19 3} Kc5 {#23/15 1} 173.
Nxe6+ {19.66/18 1} Kc6 {#13/15 3} 174. Nf8 {26.09/19 0 (Nd4+)} Kc7 {#14/14 9}
175. Kxc4 {#14/22 0} Kc6 {28.77/14 4 (Kd8)} 176. Nxg6 {#13/22 5 (Ne6)} Kd7 {#9/
19 4 (Kc7)} 177. Kd5 {#9/24 4} Kc7 {#8/18 0 (Kc8)} 178. e6 {#9/22 4} Kc8 {#7/
18 0 (Kd8)} 179. Kd6 {#7/22 7 (Ne5)} Kd8 {#6/17 8} 180. e7+ {#6/24 0} Ke8 {#5/
17 7} 181. g4 {#5/25 0} Kf7 {#4/16 4 (hxg4)} 182. Ne5+ {#4/22 6} Kg8 {#3/14 0
(Ke8)} 183. e8=Q+ {#3/18 2} Kh7 {#2/14 2} 184. Qg6+ {#2/18 0} Kh8 {#1/14 0}
185. Nf7# {#1/125 0} 1-0

[ernest]

In infinite analysis, DR4 needs a few minutes before discovering that 157... Ba1 is bad

Analysis by Deep Rybka 4 w32: (2-cores)
157...Ba1 158.Nf7 Kc6 159.Nd6[] Kd5 160.Nb5[] e3 161.Kd1[] Kc6 162.Na7+ Kd5 163.Nb5[] Kc6 164.Na7+ Kd5 165.Nb5[] Kc6 166.Na7+ Kd5 167.Nb5[] Kc6 168.Na7+ Kd5 169.Nb5[] Kc6 170.Na7+ Kd5 171.Nb5[] Kc6 172.Na7+ Kd5
= (0.00) Depth: 28 00:00:45 6055kN
157...Ba3
= (0.00) Depth: 29 00:02:56 23826kN, tb=115

[robbolito]

[Event "Blitz:10'"]
[Site "Milwaukee"]
[Date "2010.10.31"]
[Round "1"]
[White "IvanHoe T50K.x64POPCNT"]
[Black "Rybka 3.x64"]
[Result "1-0"]
[ECO "D43"]
[WhiteElo "3190"]
[BlackElo "3190"]
[Annotator "0.05;-0.23"]
[PlyCount "89"]
[TimeControl "600"]

1. c4 {B/0 0} Nf6 {B/0 0} 2. d4 {B/0 0} c6 {B/0 0} 3. Nc3 {B/0 0} d5 {B/0 0} 4.
Nf3 {B/0 0} e6 {B/0 0} 5. Bg5 {B/0 0} h6 {B/0 0} 6. Bh4 {B/0 0} dxc4 {B/0 0} 7.
e4 {B/0 0} g5 {B/0 0} 8. Bg3 {B/0 0} b5 {B/0 0} 9. Be2 {B/0 0} Bb7 {B/0 0} 10.
h4 {B/0 0} g4 {Both last book move B/0 0} 11. Ne5 {0.05/21 53} h5 {-0.23/13 11}
12. O-O {0.08/20 32} Nbd7 {-0.13/12 9} 13. Qc2 {0.00/19 6} Nxe5 {-0.05/14 32}
14. Bxe5 {0.00/19 11} Rg8 {(Bf8-h6) -0.09/14 5} 15. Rfd1 {0.13/19 7} Rg6 {-0.
05/15 24} 16. Bf1 {(Be5-f4) 0.09/20 17} a6 {(Nf6-d7) -0.06/13 7} 17. a4 {0.09/
21 60} Nd7 {-0.05/13 17} 18. Bg3 {0.03/20 3} Qb6 {(Nd7-b6) 0.00/15 14} 19. Ne2
{(e4-e5) 0.01/20 32} Be7 {(Bf8-g7) -0.06/13 8} 20. Nf4 {0.00/20 15} Rh6 {-0.11/
14 7} 21. Qd2 {(Nf4-e2) 0.00/20 6} Rh8 {(Rh6-h7) -0.22/14 7} 22. Qe3 {-0.05/20
76} e5 {(Ra8-d8) -0.28/13 9} 23. Ne2 {-0.07/18 2} Bf6 {-0.29/14 5} 24. Rd2 {
(a4-a5) -0.07/19 11} O-O-O {-0.08/14 12} 25. b3 {0.00/18 2} Bg7 {-0.08/14 14}
26. Rdd1 {0.16/17 2} c5 {0.12/14 17} 27. d5 {0.19/17 2} cxb3 {0.23/15 10} 28.
axb5 {0.24/18 3} b2 {(a6xb5) 0.33/16 17} 29. Rab1 {0.35/19 2} axb5 {0.33/16 5}
30. Nc3 {(Rb1xb2) 0.37/19 2} Bh6 {0.47/15 13} 31. Qd3 {(Qe3-e1) 0.28/18 2} b4 {
0.35/14 5} 32. Na4 {0.46/21 14} Qd6 {(Qb6-a5) 0.43/15 7} 33. Qc2 {0.50/21 10}
f6 {(Bh6-c1) 0.36/14 3} 34. Nxb2 {(Bf1-b5) 0.95/20 9} Kb8 {(Bh6-f8) 0.74/14 5}
35. Nc4 {1.67/18 2} Qc7 {0.83/14 5} 36. Ra1 {(Bg3-h2) 1.67/16 0} Rdg8 {2.40/13
49} 37. d6 {(Qc2-a4) 4.67/17 7} Qc6 {4.89/13 13} 38. Qa2 {4.67/15 0} Qxe4 {5.
15/13 35} 39. Qa5 {(Qa2-a7+) 5.28/17 2} Qc6 {7.48/12 35} 40. Qa7+ {5.28/16 0}
Kc8 {3.95/9 0} 41. Na5 {5.88/18 2} Qb6 {3.95/9 0} 42. Nxb7 {5.88/17 0} Qxa7 {
7.80/13 14} 43. Rxa7 {6.07/17 2} Kb8 {7.83/12 12} 44. Rda1 {6.07/15 0} Rg7 {7.
83/11 8} 45. Nxc5 {8.25/17 3} 1-0

[hyatt]

In infinite analysis, DR4 needs a few minutes before discovering that 157... Ba1 is bad

Analysis by Deep Rybka 4 w32: (2-cores)
157...Ba1 158.Nf7 Kc6 159.Nd6[] Kd5 160.Nb5[] e3 161.Kd1[] Kc6 162.Na7+ Kd5 163.Nb5[] Kc6 164.Na7+ Kd5 165.Nb5[] Kc6 166.Na7+ Kd5 167.Nb5[] Kc6 168.Na7+ Kd5 169.Nb5[] Kc6 170.Na7+ Kd5 171.Nb5[] Kc6 172.Na7+ Kd5
= (0.00) Depth: 28 00:00:45 6055kN
157...Ba3
= (0.00) Depth: 29 00:02:56 23826kN, tb=115

??

0.00 is not "bad". It is "draw". Post was about "losing".

[Uly]

157...Ba1 fails low (at depth 29) and Rybka finds that 157...Ba3 is better. I hate how Rybka doesn't tell the user about the fail low, that's why the "Always score main move" and "Display upperbounds" options were added, it would force Rybka to show the fail low to the user and give a score to 157...Ba1, instead of just silently switching to 157...Ba3.

[ernest]

0.00 is not "bad". It is "draw". Post was about "losing".

Come on Bob, you're getting picky...

I just wanted to say that it takes "some time" for Rybka to prefer 157...Ba3 at (0.00),
which means that 157...Ba1 is then evaluated at "worse than (0.00)"