TalkChess.com

Not sure whether this is a known problem, but Komodo 1.2 sometimes crashes in drawn KPK endings.
See for example the game below, in my experience this happens approx. once every 1000 games.
Hope this helps,

Robert


[White "Komodo_1.2"]
[Black "Houdini_CDFO"]
[Result "0-1"]
[FEN "rnbqk1nr/pp1pppbp/6p1/2p5/2PPP3/5N2/PP3PPP/RNBQKB1R b KQkq e3"]
[TimeControl "40/5"]

1. cxd4 {-0.15/12 0.11s} 2. Nxd4 {+0.36/11 0.13s} d6 {-0.11/12 0.12s}
3. Nc3 {+0.34/10 0.11s} Nf6 {-0.11/12 0.089s} 4. Be2 {+0.38/10 0.14s}
Nbd7 {-0.11/12 0.14s} 5. Be3 {+0.59/9 0.076s} Nc5 {-0.18/11 0.12s}
6. f3 {+0.71/9 0.075s} O-O {-0.23/12 0.10s} 7. O-O {+0.66/10 0.14s}
Bd7 {-0.22/11 0.16s} 8. b4 {+0.63/9 0.075s} Ne6 {-0.25/12 0.094s}
9. Qd3 {+0.59/9 0.089s} Rc8 {-0.19/10 0.091s} 10. Rad1 {+0.60/10 0.33s}
b6 {-0.21/10 0.087s} 11. Ndb5 {+0.65/10 0.36s} a6 {-0.25/12 0.24s}
12. Nd4 {+0.58/10 0.14s} Qc7 {-0.22/11 0.15s} 13. Nxe6 {+0.63/10 0.17s}
fxe6 {-0.22/10 0.091s} 14. a3 {+0.60/9 0.065s} Be8 {-0.18/10 0.088s}
15. Bd4 {+0.71/9 0.18s} Nh5 {-0.02/12 0.13s} 16. Bxg7 {+0.27/9 0.090s}
Kxg7 {0.00/13 0.27s} 17. Qe3 {+0.17/9 0.11s} Nf4 {0.00/12 0.16s}
18. Rc1 {+0.18/9 0.12s} Bd7 {0.00/11 0.082s} 19. Rfd1 {+0.21/8 0.065s}
a5 {-0.29/11 0.66s} 20. Rd2 {+0.17/9 0.20s} Kg8 {-0.02/9 0.14s}
21. Bf1 {+0.79/9 0.097s} Bc6 {-0.31/10 0.18s} 22. g3 {+0.74/9 0.064s}
Nh5 {-0.37/11 0.063s} 23. Nd5 {+1.02/9 0.12s} Bxd5 {-0.36/11 0.066s}
24. exd5 {+1.11/7 0.010s} e5 {-0.34/11 0.063s} 25. Bh3 {+0.70/8 0.067s}
Ra8 {-0.48/11 0.15s} 26. c5 {+0.85/10 0.18s} axb4 {-0.46/11 0.070s}
27. axb4 {+0.92/10 0.12s} bxc5 {-0.48/12 0.21s} 28. bxc5 {+0.91/10 0.12s}
dxc5 {-0.48/12 0.059s} 29. Be6+ {+0.83/9 0.089s} Kg7 {-0.48/13 0.12s}
30. Rxc5 {+0.85/10 0.18s} Qd6 {-0.48/13 0.056s} 31. Rdc2 {+0.85/9 0.067s}
Nf6 {-0.48/12 0.058s} 32. Kg2 {+0.78/10 0.15s} Ra6 {-0.50/12 0.17s}
33. Qe2 {+0.80/8 0.087s} Rfa8 {-0.37/11 0.073s} 34. Rc7 {+0.69/8 0.054s}
R8a7 {-0.29/11 0.068s} 35. Rxa7 {+0.31/11 0.21s} Rxa7 {-0.28/9 0s}
36. Qb5 {+0.43/11 0.30s} Ra8 {-0.22/11 0.065s} 37. Re2 {+0.31/8 0.045s}
Rb8 {-0.08/11 0.077s} 38. Qa5 {+0.31/9 0.074s} Rb1 {-0.07/11 0.14s}
39. Qc3 {+0.34/8 0.037s} Qb6 {-0.07/12 0.089s} 40. Rf2 {+0.31/8 0.045s}
Qd6 {-0.07/12 0.069s} 41. Qd3 {+0.35/8 0.039s} Rb4 {-0.08/12 0.096s}
42. Re2 {+0.14/12 0.33s} Rd4 {0.00/14 0.093s} 43. Qe3 {+0.12/13 0.10s}
Nxd5 {-0.03/14 0.087s} 44. Qxe5+ {+0.18/13 0.12s} Qxe5 {-0.01/16 0.21s}
45. Rxe5 {+0.18/10 0.011s} Nc7 {0.00/16 0.12s} 46. Bb3 {+0.16/12 0.080s}
Rd2+ {+0.01/14 0.18s} 47. Kh3 {+0.14/13 0.11s} Kf6 {0.00/15 0.096s}
48. Rc5 {+0.08/13 0.16s} Ne8 {0.00/15 0.14s} 49. g4 {+0.19/11 0.086s}
Rd3 {0.00/13 0.12s} 50. g5+ {+0.17/10 0.11s} Kg7 {-0.01/1 0s}
51. Bd5 {+0.14/11 0.091s} Nd6 {-0.02/13 0.088s} 52. Kg3 {+0.13/11 0.12s}
h6 {-0.02/13 0.18s} 53. h4 {0.00/12 0.31s} Nf5+ {-0.02/13 0.11s}
54. Kf4 {+0.02/12 0.089s} Nxh4 {-0.01/12 0.092s} 55. gxh6+ {+0.02/12 0.098s}
Kxh6 {-0.01/11 0.001s} 56. Be4 {-0.03/11 0.098s} Rd4 {-0.01/14 0.17s}
57. Ra5 {+0.02/11 0.17s} Ng2+ {0.00/14 0.11s} 58. Ke5 {+0.02/12 0.14s}
Rb4 {+0.01/14 0.13s} 59. Ra7 {+0.02/11 0.11s} Kg5 {+0.02/13 0.10s}
60. Rxe7 {+0.03/11 0.12s} Rb5+ {0.00/13 0.11s} 61. Kd4 {+0.05/10 0.096s}
Rb6 {0.00/14 0.34s} 62. Bd5 {+0.05/10 0.074s} Nf4 {+0.03/13 0.096s}
63. Bc4 {+0.02/11 0.19s} Rc6 {+0.05/13 0.11s} 64. Re4 {+0.02/11 0.35s}
Kf5 {+0.04/14 0.17s} 65. Re5+ {+0.03/11 0.11s} Kf6 {+0.04/12 0s}
66. Re8 {+0.01/11 0.12s} Rc7 {+0.05/14 0.24s} 67. Kc3 {+0.01/9 0.078s}
Kg5 {+0.05/14 0.12s} 68. Re4 {0.00/9 0.068s} Kf5 {+0.05/15 0.11s}
69. Kb4 {0.00/12 0.094s} Rc8 {+0.10/14 0.10s} 70. Re7 {-0.03/10 0.094s}
g5 {+0.10/13 0.10s} 71. Rf7+ {+0.01/10 0.083s} Kg6 {+0.10/15 0.20s}
72. Rb7 {0.00/10 0.081s} Rd8 {+0.09/14 0.12s} 73. Rb6+ {0.00/10 0.061s}
Kf5 {+0.09/15 0.18s} 74. Rb5+ {0.00/12 0.16s} Kf6 {+0.08/16 0.12s}
75. Kb3 {0.00/11 0.081s} Rd6 {+0.08/14 0.11s} 76. Kb4 {0.00/14 0.098s}
Kg6 {+0.07/14 0.15s} 77. Kc5 {0.00/11 0.068s} Rd2 {+0.08/13 0.16s}
78. Kc6 {0.00/9 0.078s} Rf2 {+0.09/12 0.15s} 79. Rb3 {0.00/12 0.087s}
Kf5 {+0.08/14 0.080s} 80. Ra3 {-0.01/10 0.10s} Ke5 {+0.08/13 0.12s}
81. Ra5+ {0.00/10 0.099s} Kf6 {+0.08/14 0.091s} 82. Ra3 {0.00/13 0.10s}
Rb2 {+0.08/14 0.12s} 83. Ra8 {0.00/13 0.11s} Rd2 {+0.07/14 0.088s}
84. Rf8+ {0.00/12 0.14s} Ke5 {+0.04/16 0.13s} 85. Re8+ {0.00/13 0.13s}
Kd4 {+0.01/16 0.13s} 86. Bb5 {0.00/11 0.11s} Rh2 {+0.08/13 0.13s}
87. Re4+ {+0.02/10 0.098s} Kc3 {+0.08/11 0s} 88. Kc5 {+0.03/11 0.14s}
Rh1 {+0.04/13 0.096s} 89. Re3+ {+0.08/9 0.095s} Kd2 {+0.03/13 0.10s}
90. Kd4 {+0.05/11 0.17s} Rb1 {+0.02/12 0.20s} 91. Bc4 {+0.08/11 0.14s}
Ra1 {+0.01/13 0.15s} 92. Rb3 {+0.05/12 0.18s} Ra7 {0.00/13 0.10s}
93. Rb2+ {+0.13/10 0.14s} Ke1 {0.00/14 0.12s} 94. Ke4 {+0.14/11 0.096s}
Ra3 {0.00/13 0.094s} 95. Bb5 {+0.13/12 0.42s} Kd1 {0.00/12 0.094s}
96. Rh2 {+0.13/10 0.077s} Rc3 {0.00/13 0.14s} 97. Ra2 {+0.12/10 0.086s}
Kc1 {0.00/13 0.15s} 98. Be8 {+0.14/11 0.12s} Rc5 {0.00/12 0.14s}
99. Bd7 {+0.13/11 0.096s} Kd1 {0.00/13 0.15s} 100. Ba4+ {+0.13/10 0.11s}
Ke1 {0.00/15 0.10s} 101. Bb3 {+0.14/11 0.079s} Rc3 {0.00/13 0.15s}
102. Bf7 {+0.09/11 0.090s} Rc7 {+0.01/14 0.17s} 103. Bg8 {+0.06/12 0.092s}
Ne2 {+0.01/13 0.092s} 104. Rb2 {+0.06/10 0.16s} Rc3 {0.00/13 0.10s}
105. Bd5 {+0.04/10 0.15s} Kf2 {0.00/14 0.15s} 106. Kf5 {0.00/11 0.13s}
Ke3 {+0.01/14 0.24s} 107. Kg4 {+0.12/10 0.085s} Rc1 {0.00/13 0.25s}
108. Rb3+ {+0.12/9 0.10s} Kd4 {0.00/13 0.11s} 109. Bb7 {+0.19/11 0.20s}
Nc3 {0.00/12 0.081s} 110. Kxg5 {+0.58/10 0.089s} Rg1+ {-0.01/12 0.084s}
111. Kf6 {+0.57/11 0.096s} Rg8 {-0.02/13 0.17s} 112. Rb4+ {+0.57/11 0.36s}
Kc5 {-0.01/13 0.097s} 113. Rb2 {+0.57/11 0.094s} Rf8+ {-0.01/12 0.097s}
114. Kg7 {+0.55/11 0.064s} Rf4 {-0.02/14 0.12s} 115. Kg6 {+0.55/10 0.062s}
Rf8 {-0.01/14 0.22s} 116. Rd2 {+0.55/10 0.11s} Nb5 {-0.01/13 0.10s}
117. Rc2+ {+0.57/11 0.37s} Kd4 {-0.01/13 0.15s} 118. Kg5 {+0.55/11 0.15s}
Ke3 {-0.01/12 0.11s} 119. Rc5 {+0.57/10 0.058s} Nd6 {0.00/12 0.071s}
120. Bc6 {+0.55/10 0.054s} Rg8+ {-0.01/13 0.11s} 121. Kf6 {+0.52/10 0.056s}
Rh8 {-0.01/14 0.20s} 122. Ke7 {+0.48/10 0.079s} Rh6 {0.00/13 0.089s}
123. Kd7 {+0.41/10 0.11s} Kf4 {0.00/13 0.091s} 124. Ra5 {+0.32/12 0.45s}
Nf5 {0.00/14 0.088s} 125. Ra4+ {+0.34/11 0.088s} Ke3 {0.00/13 0.087s}
126. Ra3+ {+0.34/10 0.078s} Kf4 {0.00/15 0.092s} 127. Rd3 {+0.33/11 0.11s}
Ke5 {+0.03/12 0.087s} 128. Kc7 {+0.44/10 0.075s} Rh4 {+0.01/12 0.093s}
129. Rd8 {+0.49/9 0.093s} Rc4 {0.00/12 0.12s} 130. Re8+ {+0.44/10 0.18s}
Kf6 {0.00/15 0.17s} 131. Kb6 {+0.45/10 0.086s} Ne7 {0.00/14 0.098s}
132. Bb7 {+0.47/10 0.13s} Rb4+ {0.00/12 0.090s} 133. Kc7 {+0.53/12 0.19s}
Rc4+ {0.00/13 0.092s} 134. Kd6 {+0.52/12 0.11s} Nf5+ {0.00/14 0.12s}
135. Kd5 {+0.49/12 0.18s} Rc7 {0.00/15 0.13s} 136. Ba6 {+0.47/11 0.12s}
Ne7+ {0.00/12 0.12s} 137. Ke4 {+0.56/11 0.083s} Rc6 {0.00/12 0.098s}
138. Rf8+ {+0.60/10 0.086s} Kg7 {-0.02/14 0.12s} 139. Ra8 {+0.56/12 0.23s}
Re6+ {-0.02/13 0.10s} 140. Kd3 {+0.54/11 0.11s} Ng6 {-0.02/13 0.20s}
141. Bb7 {+0.66/11 0.23s} Nf4+ {-0.04/12 0.10s} 142. Kd4 {+0.66/11 0.089s}
Ne2+ {-0.04/13 0.23s} 143. Kc5 {+0.65/11 0.081s} Re5+ {-0.03/12 0.13s}
144. Kd6 {+0.66/10 0.082s} Rg5 {-0.03/12 0.17s} 145. Bd5 {+0.70/10 0.076s}
Nf4 {-0.03/12 0.10s} 146. Rg8+ {+0.69/11 0.067s} Kh6 {-0.02/10 0.005s}
147. Bc4 {+0.03/12 0.072s} Rxg8 {0.00/15 0.12s} 148. Bxg8 {+0.03/11 0.026s}
Kg7 {0.00/17 0.13s} 149. Bd5 {+0.03/14 0.12s} Nxd5 {0.00/18 0.13s}
150. Kxd5 {0.00/35 0.077s} Kf6 {0.00/1 0s} 151. Kd4 {0.00/49 0.094s}
Kf5 {0.00/1 0s} 152. Ke3 {0.00/58 0.072s} Ke5 {0.00/1 0.001s}
153. f4+ {0.00/66 0.089s} Kf6 {0.00/1 0s} 154. Ke4 {0.00/92 0.077s}
Ke6 {0.00/1 0s} 155. Ke3 {0.00/99 0.040s} Kf7 {0.00/1 0.001s}
156. Kd3 {0.00/93 0.081s} Kg8 {0.00/1 0s} 157. Kc2 {0.00/51 0.091s}
Kh8 {0.00/1 0s} 158. Kb3 {0.00/78 0.087s} Kg8 {0.00/1 0s}
159. Ka4 {0.00/87 0.091s} Kh8 {0.00/1 0s} 160. Ka5 {0.00/68 0.099s}
Kg8 {0.00/1 0s} 161. Kb6 {0.00/56 0.10s} Kh8 {0.00/1 0s}
162. Kc5 {0.00/70 0.086s} Kg8 {0.00/1 0s} 163. Kc4 {0.00/89 0.088s}
Kf8 {0.00/1 0s} 164. f5 {0.00/68 0.086s} Kg8 {0.00/1 0s}
165. Kc5 {0.00/74 0.099s} Kf8 {0.00/1 0s} 166. Kb6 {0.00/86 0.091s}
Kg8 {0.00/1 0s} 167. Kc7 {0.00/71 0.089s} Kf8 {0.00/1 0s}
168. Kd7 {0.00/68 0.089s} Kf7 {0.00/1 0.001s, White's connection stalls} 0-1

I cannot make it crash using xboard either in analyze mode or by playing the black piece manually.

Komodo probably will crash if a game is longer than 1024 ply or 512 moves. However the search has no artificial limit, so even 100 ply search won't be an issue even if you are move 500 for instance.

Komodo does 100 ply search in this position and many leading up to it, which is it's limit. I'm wondering if that is somehow involved? But it successfully did that during my little debug session too with no problems.

I have heard of similar reports of Komodo crashing in late endings - are you pretty sure it's KPK only? That would be a huge clue.

It never crashes on my own tester, but that may be because it's configured to call it draw at move 150. I'm looking for any kind of limits in Komodo that would cause this but if it's KPK then I have less to look at.

Houdini wrote:Not sure whether this is a known problem, but Komodo 1.2 sometimes crashes in drawn KPK endings.
See for example the game below, in my experience this happens approx. once every 1000 games.
Hope this helps,

Robert


[White "Komodo_1.2"]
[Black "Houdini_CDFO"]
[Result "0-1"]
[FEN "rnbqk1nr/pp1pppbp/6p1/2p5/2PPP3/5N2/PP3PPP/RNBQKB1R b KQkq e3"]
[TimeControl "40/5"]

1. cxd4 {-0.15/12 0.11s} 2. Nxd4 {+0.36/11 0.13s} d6 {-0.11/12 0.12s}
3. Nc3 {+0.34/10 0.11s} Nf6 {-0.11/12 0.089s} 4. Be2 {+0.38/10 0.14s}
Nbd7 {-0.11/12 0.14s} 5. Be3 {+0.59/9 0.076s} Nc5 {-0.18/11 0.12s}
6. f3 {+0.71/9 0.075s} O-O {-0.23/12 0.10s} 7. O-O {+0.66/10 0.14s}
Bd7 {-0.22/11 0.16s} 8. b4 {+0.63/9 0.075s} Ne6 {-0.25/12 0.094s}
9. Qd3 {+0.59/9 0.089s} Rc8 {-0.19/10 0.091s} 10. Rad1 {+0.60/10 0.33s}
b6 {-0.21/10 0.087s} 11. Ndb5 {+0.65/10 0.36s} a6 {-0.25/12 0.24s}
12. Nd4 {+0.58/10 0.14s} Qc7 {-0.22/11 0.15s} 13. Nxe6 {+0.63/10 0.17s}
fxe6 {-0.22/10 0.091s} 14. a3 {+0.60/9 0.065s} Be8 {-0.18/10 0.088s}
15. Bd4 {+0.71/9 0.18s} Nh5 {-0.02/12 0.13s} 16. Bxg7 {+0.27/9 0.090s}
Kxg7 {0.00/13 0.27s} 17. Qe3 {+0.17/9 0.11s} Nf4 {0.00/12 0.16s}
18. Rc1 {+0.18/9 0.12s} Bd7 {0.00/11 0.082s} 19. Rfd1 {+0.21/8 0.065s}
a5 {-0.29/11 0.66s} 20. Rd2 {+0.17/9 0.20s} Kg8 {-0.02/9 0.14s}
21. Bf1 {+0.79/9 0.097s} Bc6 {-0.31/10 0.18s} 22. g3 {+0.74/9 0.064s}
Nh5 {-0.37/11 0.063s} 23. Nd5 {+1.02/9 0.12s} Bxd5 {-0.36/11 0.066s}
24. exd5 {+1.11/7 0.010s} e5 {-0.34/11 0.063s} 25. Bh3 {+0.70/8 0.067s}
Ra8 {-0.48/11 0.15s} 26. c5 {+0.85/10 0.18s} axb4 {-0.46/11 0.070s}
27. axb4 {+0.92/10 0.12s} bxc5 {-0.48/12 0.21s} 28. bxc5 {+0.91/10 0.12s}
dxc5 {-0.48/12 0.059s} 29. Be6+ {+0.83/9 0.089s} Kg7 {-0.48/13 0.12s}
30. Rxc5 {+0.85/10 0.18s} Qd6 {-0.48/13 0.056s} 31. Rdc2 {+0.85/9 0.067s}
Nf6 {-0.48/12 0.058s} 32. Kg2 {+0.78/10 0.15s} Ra6 {-0.50/12 0.17s}
33. Qe2 {+0.80/8 0.087s} Rfa8 {-0.37/11 0.073s} 34. Rc7 {+0.69/8 0.054s}
R8a7 {-0.29/11 0.068s} 35. Rxa7 {+0.31/11 0.21s} Rxa7 {-0.28/9 0s}
36. Qb5 {+0.43/11 0.30s} Ra8 {-0.22/11 0.065s} 37. Re2 {+0.31/8 0.045s}
Rb8 {-0.08/11 0.077s} 38. Qa5 {+0.31/9 0.074s} Rb1 {-0.07/11 0.14s}
39. Qc3 {+0.34/8 0.037s} Qb6 {-0.07/12 0.089s} 40. Rf2 {+0.31/8 0.045s}
Qd6 {-0.07/12 0.069s} 41. Qd3 {+0.35/8 0.039s} Rb4 {-0.08/12 0.096s}
42. Re2 {+0.14/12 0.33s} Rd4 {0.00/14 0.093s} 43. Qe3 {+0.12/13 0.10s}
Nxd5 {-0.03/14 0.087s} 44. Qxe5+ {+0.18/13 0.12s} Qxe5 {-0.01/16 0.21s}
45. Rxe5 {+0.18/10 0.011s} Nc7 {0.00/16 0.12s} 46. Bb3 {+0.16/12 0.080s}
Rd2+ {+0.01/14 0.18s} 47. Kh3 {+0.14/13 0.11s} Kf6 {0.00/15 0.096s}
48. Rc5 {+0.08/13 0.16s} Ne8 {0.00/15 0.14s} 49. g4 {+0.19/11 0.086s}
Rd3 {0.00/13 0.12s} 50. g5+ {+0.17/10 0.11s} Kg7 {-0.01/1 0s}
51. Bd5 {+0.14/11 0.091s} Nd6 {-0.02/13 0.088s} 52. Kg3 {+0.13/11 0.12s}
h6 {-0.02/13 0.18s} 53. h4 {0.00/12 0.31s} Nf5+ {-0.02/13 0.11s}
54. Kf4 {+0.02/12 0.089s} Nxh4 {-0.01/12 0.092s} 55. gxh6+ {+0.02/12 0.098s}
Kxh6 {-0.01/11 0.001s} 56. Be4 {-0.03/11 0.098s} Rd4 {-0.01/14 0.17s}
57. Ra5 {+0.02/11 0.17s} Ng2+ {0.00/14 0.11s} 58. Ke5 {+0.02/12 0.14s}
Rb4 {+0.01/14 0.13s} 59. Ra7 {+0.02/11 0.11s} Kg5 {+0.02/13 0.10s}
60. Rxe7 {+0.03/11 0.12s} Rb5+ {0.00/13 0.11s} 61. Kd4 {+0.05/10 0.096s}
Rb6 {0.00/14 0.34s} 62. Bd5 {+0.05/10 0.074s} Nf4 {+0.03/13 0.096s}
63. Bc4 {+0.02/11 0.19s} Rc6 {+0.05/13 0.11s} 64. Re4 {+0.02/11 0.35s}
Kf5 {+0.04/14 0.17s} 65. Re5+ {+0.03/11 0.11s} Kf6 {+0.04/12 0s}
66. Re8 {+0.01/11 0.12s} Rc7 {+0.05/14 0.24s} 67. Kc3 {+0.01/9 0.078s}
Kg5 {+0.05/14 0.12s} 68. Re4 {0.00/9 0.068s} Kf5 {+0.05/15 0.11s}
69. Kb4 {0.00/12 0.094s} Rc8 {+0.10/14 0.10s} 70. Re7 {-0.03/10 0.094s}
g5 {+0.10/13 0.10s} 71. Rf7+ {+0.01/10 0.083s} Kg6 {+0.10/15 0.20s}
72. Rb7 {0.00/10 0.081s} Rd8 {+0.09/14 0.12s} 73. Rb6+ {0.00/10 0.061s}
Kf5 {+0.09/15 0.18s} 74. Rb5+ {0.00/12 0.16s} Kf6 {+0.08/16 0.12s}
75. Kb3 {0.00/11 0.081s} Rd6 {+0.08/14 0.11s} 76. Kb4 {0.00/14 0.098s}
Kg6 {+0.07/14 0.15s} 77. Kc5 {0.00/11 0.068s} Rd2 {+0.08/13 0.16s}
78. Kc6 {0.00/9 0.078s} Rf2 {+0.09/12 0.15s} 79. Rb3 {0.00/12 0.087s}
Kf5 {+0.08/14 0.080s} 80. Ra3 {-0.01/10 0.10s} Ke5 {+0.08/13 0.12s}
81. Ra5+ {0.00/10 0.099s} Kf6 {+0.08/14 0.091s} 82. Ra3 {0.00/13 0.10s}
Rb2 {+0.08/14 0.12s} 83. Ra8 {0.00/13 0.11s} Rd2 {+0.07/14 0.088s}
84. Rf8+ {0.00/12 0.14s} Ke5 {+0.04/16 0.13s} 85. Re8+ {0.00/13 0.13s}
Kd4 {+0.01/16 0.13s} 86. Bb5 {0.00/11 0.11s} Rh2 {+0.08/13 0.13s}
87. Re4+ {+0.02/10 0.098s} Kc3 {+0.08/11 0s} 88. Kc5 {+0.03/11 0.14s}
Rh1 {+0.04/13 0.096s} 89. Re3+ {+0.08/9 0.095s} Kd2 {+0.03/13 0.10s}
90. Kd4 {+0.05/11 0.17s} Rb1 {+0.02/12 0.20s} 91. Bc4 {+0.08/11 0.14s}
Ra1 {+0.01/13 0.15s} 92. Rb3 {+0.05/12 0.18s} Ra7 {0.00/13 0.10s}
93. Rb2+ {+0.13/10 0.14s} Ke1 {0.00/14 0.12s} 94. Ke4 {+0.14/11 0.096s}
Ra3 {0.00/13 0.094s} 95. Bb5 {+0.13/12 0.42s} Kd1 {0.00/12 0.094s}
96. Rh2 {+0.13/10 0.077s} Rc3 {0.00/13 0.14s} 97. Ra2 {+0.12/10 0.086s}
Kc1 {0.00/13 0.15s} 98. Be8 {+0.14/11 0.12s} Rc5 {0.00/12 0.14s}
99. Bd7 {+0.13/11 0.096s} Kd1 {0.00/13 0.15s} 100. Ba4+ {+0.13/10 0.11s}
Ke1 {0.00/15 0.10s} 101. Bb3 {+0.14/11 0.079s} Rc3 {0.00/13 0.15s}
102. Bf7 {+0.09/11 0.090s} Rc7 {+0.01/14 0.17s} 103. Bg8 {+0.06/12 0.092s}
Ne2 {+0.01/13 0.092s} 104. Rb2 {+0.06/10 0.16s} Rc3 {0.00/13 0.10s}
105. Bd5 {+0.04/10 0.15s} Kf2 {0.00/14 0.15s} 106. Kf5 {0.00/11 0.13s}
Ke3 {+0.01/14 0.24s} 107. Kg4 {+0.12/10 0.085s} Rc1 {0.00/13 0.25s}
108. Rb3+ {+0.12/9 0.10s} Kd4 {0.00/13 0.11s} 109. Bb7 {+0.19/11 0.20s}
Nc3 {0.00/12 0.081s} 110. Kxg5 {+0.58/10 0.089s} Rg1+ {-0.01/12 0.084s}
111. Kf6 {+0.57/11 0.096s} Rg8 {-0.02/13 0.17s} 112. Rb4+ {+0.57/11 0.36s}
Kc5 {-0.01/13 0.097s} 113. Rb2 {+0.57/11 0.094s} Rf8+ {-0.01/12 0.097s}
114. Kg7 {+0.55/11 0.064s} Rf4 {-0.02/14 0.12s} 115. Kg6 {+0.55/10 0.062s}
Rf8 {-0.01/14 0.22s} 116. Rd2 {+0.55/10 0.11s} Nb5 {-0.01/13 0.10s}
117. Rc2+ {+0.57/11 0.37s} Kd4 {-0.01/13 0.15s} 118. Kg5 {+0.55/11 0.15s}
Ke3 {-0.01/12 0.11s} 119. Rc5 {+0.57/10 0.058s} Nd6 {0.00/12 0.071s}
120. Bc6 {+0.55/10 0.054s} Rg8+ {-0.01/13 0.11s} 121. Kf6 {+0.52/10 0.056s}
Rh8 {-0.01/14 0.20s} 122. Ke7 {+0.48/10 0.079s} Rh6 {0.00/13 0.089s}
123. Kd7 {+0.41/10 0.11s} Kf4 {0.00/13 0.091s} 124. Ra5 {+0.32/12 0.45s}
Nf5 {0.00/14 0.088s} 125. Ra4+ {+0.34/11 0.088s} Ke3 {0.00/13 0.087s}
126. Ra3+ {+0.34/10 0.078s} Kf4 {0.00/15 0.092s} 127. Rd3 {+0.33/11 0.11s}
Ke5 {+0.03/12 0.087s} 128. Kc7 {+0.44/10 0.075s} Rh4 {+0.01/12 0.093s}
129. Rd8 {+0.49/9 0.093s} Rc4 {0.00/12 0.12s} 130. Re8+ {+0.44/10 0.18s}
Kf6 {0.00/15 0.17s} 131. Kb6 {+0.45/10 0.086s} Ne7 {0.00/14 0.098s}
132. Bb7 {+0.47/10 0.13s} Rb4+ {0.00/12 0.090s} 133. Kc7 {+0.53/12 0.19s}
Rc4+ {0.00/13 0.092s} 134. Kd6 {+0.52/12 0.11s} Nf5+ {0.00/14 0.12s}
135. Kd5 {+0.49/12 0.18s} Rc7 {0.00/15 0.13s} 136. Ba6 {+0.47/11 0.12s}
Ne7+ {0.00/12 0.12s} 137. Ke4 {+0.56/11 0.083s} Rc6 {0.00/12 0.098s}
138. Rf8+ {+0.60/10 0.086s} Kg7 {-0.02/14 0.12s} 139. Ra8 {+0.56/12 0.23s}
Re6+ {-0.02/13 0.10s} 140. Kd3 {+0.54/11 0.11s} Ng6 {-0.02/13 0.20s}
141. Bb7 {+0.66/11 0.23s} Nf4+ {-0.04/12 0.10s} 142. Kd4 {+0.66/11 0.089s}
Ne2+ {-0.04/13 0.23s} 143. Kc5 {+0.65/11 0.081s} Re5+ {-0.03/12 0.13s}
144. Kd6 {+0.66/10 0.082s} Rg5 {-0.03/12 0.17s} 145. Bd5 {+0.70/10 0.076s}
Nf4 {-0.03/12 0.10s} 146. Rg8+ {+0.69/11 0.067s} Kh6 {-0.02/10 0.005s}
147. Bc4 {+0.03/12 0.072s} Rxg8 {0.00/15 0.12s} 148. Bxg8 {+0.03/11 0.026s}
Kg7 {0.00/17 0.13s} 149. Bd5 {+0.03/14 0.12s} Nxd5 {0.00/18 0.13s}
150. Kxd5 {0.00/35 0.077s} Kf6 {0.00/1 0s} 151. Kd4 {0.00/49 0.094s}
Kf5 {0.00/1 0s} 152. Ke3 {0.00/58 0.072s} Ke5 {0.00/1 0.001s}
153. f4+ {0.00/66 0.089s} Kf6 {0.00/1 0s} 154. Ke4 {0.00/92 0.077s}
Ke6 {0.00/1 0s} 155. Ke3 {0.00/99 0.040s} Kf7 {0.00/1 0.001s}
156. Kd3 {0.00/93 0.081s} Kg8 {0.00/1 0s} 157. Kc2 {0.00/51 0.091s}
Kh8 {0.00/1 0s} 158. Kb3 {0.00/78 0.087s} Kg8 {0.00/1 0s}
159. Ka4 {0.00/87 0.091s} Kh8 {0.00/1 0s} 160. Ka5 {0.00/68 0.099s}
Kg8 {0.00/1 0s} 161. Kb6 {0.00/56 0.10s} Kh8 {0.00/1 0s}
162. Kc5 {0.00/70 0.086s} Kg8 {0.00/1 0s} 163. Kc4 {0.00/89 0.088s}
Kf8 {0.00/1 0s} 164. f5 {0.00/68 0.086s} Kg8 {0.00/1 0s}
165. Kc5 {0.00/74 0.099s} Kf8 {0.00/1 0s} 166. Kb6 {0.00/86 0.091s}
Kg8 {0.00/1 0s} 167. Kc7 {0.00/71 0.089s} Kf8 {0.00/1 0s}
168. Kd7 {0.00/68 0.089s} Kf7 {0.00/1 0.001s, White's connection stalls} 0-1

Don, this test was run with cutechess-cli, repeating TC of 40/5 (seconds).
The three times I've looked at the PGN after a crash I found a drawn KPK endgame in which Komodo had the KP side. The problem could obviously be more general - KPK may be the only configuration where Komodo encounters "whatever causes this problem" in very fast games.

Robert

Houdini wrote:Don, this test was run with cutechess-cli, repeating TC of 40/5 (seconds).
The three times I've looked at the PGN after a crash I found a drawn KPK endgame in which Komodo had the KP side. The problem could obviously be more general - KPK may be the only configuration where Komodo encounters "whatever causes this problem" in very fast games.

Robert

That's a good clue. In a couple of other bug reports it was not a KPK position, but it would be with a single piece removed for instance. So I think the problem is very likely to be KPK but there is a chance it could have something to do with single pawn endings I suppose.

Thanks for the report.

Here's the latest occurrence, another drawn KPK:

[White "Komodo_1.2"]
[Black "Houdini_CDFRP"]
[Result "0-1"]
[FEN "r1bq1rk1/ppp1bppp/3p1n2/8/3QPB2/2N5/PPP1BPPP/R3K2R w KQ -"]
[TimeControl "40/5"]

1. O-O {+0.74/9 0.092s} Be6 {-0.36/12 0.19s} 2. h3 {+0.76/8 0.075s}
Nd7 {-0.30/12 0.13s} 3. Nd5 {+0.59/9 0.11s} Bf6 {-0.34/12 0.26s}
4. Nxf6+ {+0.51/10 0.20s} Qxf6 {-0.33/10 0s} 5. Qxf6 {+0.50/11 0.098s}
Nxf6 {-0.24/13 0.17s} 6. Bf3 {+0.48/10 0.086s} Nd7 {-0.24/12 0.085s}
7. b3 {+0.48/10 0.12s} Ne5 {-0.20/12 0.10s} 8. Bh5 {+0.45/10 0.12s}
Nc6 {-0.20/10 0.14s} 9. Rfe1 {+0.37/10 0.18s} f6 {-0.12/12 0.11s}
10. c3 {+0.34/10 0.14s} a5 {-0.12/13 0.13s} 11. Bd1 {+0.28/9 0.094s}
Bf7 {-0.08/13 0.12s} 12. Bg3 {+0.24/10 0.18s} g5 {-0.04/12 0.15s}
13. f4 {+0.34/9 0.081s} Kg7 {-0.06/11 0.10s} 14. Bc2 {+0.32/9 0.088s}
Rae8 {-0.01/11 0.14s} 15. Rab1 {+0.23/10 0.43s} gxf4 {0.00/11 0.11s}
16. Bxf4 {+0.33/11 0.10s} Bg6 {+0.01/14 0.48s} 17. Re3 {+0.29/9 0.14s}
f5 {+0.03/13 0.14s} 18. exf5 {+0.18/11 0.079s} Rxe3 {+0.03/12 0s}
19. Bxe3 {+0.22/9 0.024s} Bxf5 {+0.03/10 0.002s} 20. Bxf5 {+0.19/12 0.078s}
Rxf5 {+0.03/8 0.002s} 21. Rf1 {+0.18/11 0.12s} Kg6 {+0.05/13 0.15s}
22. g4 {+0.12/12 0.11s} Rxf1+ {+0.03/13 0.092s} 23. Kxf1 {+0.12/11 0.009s}
h5 {+0.04/14 0.15s} 24. Kg2 {+0.13/13 0.093s} Ne5 {+0.07/12 0.083s}
25. Kg3 {+0.10/13 0.15s} b5 {+0.07/13 0.15s} 26. Kf4 {+0.11/12 0.12s}
hxg4 {+0.05/13 0.15s} 27. hxg4 {+0.08/13 0.13s} a4 {+0.05/13 0.082s}
28. Bd4 {+0.19/13 0.10s} Nc6 {+0.02/13 0.092s} 29. bxa4 {+0.17/12 0.083s}
bxa4 {+0.05/14 0.090s} 30. Bf2 {+0.16/13 0.069s} Ne7 {+0.05/13 0.12s}
31. Be1 {+0.14/13 0.081s} Nd5+ {+0.05/13 0.087s} 32. Ke4 {+0.02/15 0.21s}
Nf6+ {+0.06/14 0.15s} 33. Kf3 {+0.09/15 0.076s} Nd7 {+0.05/14 0.11s}
34. Bh4 {+0.06/14 0.074s} Ne5+ {+0.05/13 0.094s} 35. Kf4 {+0.15/13 0.067s}
c6 {+0.05/14 0.12s} 36. Be7 {+0.18/15 0.12s} Nc4 {0.00/14 0.15s}
37. Ke4 {+0.09/13 0.11s} Kf7 {0.00/15 0.13s} 38. Bh4 {+0.08/14 0.12s}
Ke6 {+0.04/13 0.16s} 39. Bd8 {0.00/12 0.098s} d5+ {+0.10/13 0.11s}
40. Kf4 {0.00/13 0.10s} a3 {+0.13/14 0.13s} 41. Bg5 {0.00/15 0.091s}
Nd2 {+0.09/14 0.14s} 42. Bh6 {+0.05/13 0.083s} Nb3 {0.00/14 0.26s}
43. Kf3 {0.00/14 0.14s} c5 {0.00/14 0.11s} 44. Bf4 {+0.24/12 0.10s}
c4 {0.00/14 0.12s} 45. Be3 {+0.19/12 0.11s} Ke5 {-0.02/14 0.084s}
46. g5 {+0.28/12 0.10s} Kf5 {-0.02/15 0.14s} 47. Kf2 {+0.22/14 0.13s}
Ke5 {-0.04/15 0.13s} 48. Kg3 {+0.37/14 0.19s} d4 {-0.06/14 0.33s}
49. cxd4+ {+0.35/10 0.086s} Nxd4 {0.00/15 0.14s} 50. Bxd4+ {0.00/12 0.11s}
Kxd4 {0.00/14 0s} 51. g6 {-0.07/13 0.18s} c3 {+0.06/11 0.088s}
52. g7 {-0.05/13 0.11s} c2 {+0.06/11 0s} 53. g8=Q {-0.05/12 0.14s}
c1=Q {+0.06/9 0.001s} 54. Qf7 {-0.05/10 0.083s} Qg1+ {+0.07/13 0.10s}
55. Kh3 {-0.07/11 0.15s} Qe3+ {+0.07/13 0.11s} 56. Kh4 {-0.11/11 0.12s}
Qe4+ {+0.03/13 0.10s} 57. Kg3 {-0.05/11 0.14s} Qd3+ {+0.07/13 0.093s}
58. Kg2 {-0.03/11 0.12s} Qc3 {+0.07/13 0.10s} 59. Kh2 {-0.14/10 0.36s}
Kd3 {+0.11/13 0.096s} 60. Qg6+ {-0.24/9 0.14s} Kd2 {+0.29/11 0.12s}
61. Qb1 {-0.28/10 0.13s} Qb2 {+1.03/12 0.14s} 62. Qe4 {-0.37/11 0.21s}
Qc2 {+0.63/13 0.18s} 63. Qb4+ {-0.33/10 0.17s} Ke3+ {+0.63/14 0.12s}
64. Kg3 {-0.32/11 0.081s} Qf2+ {+0.03/14 0.80s} 65. Kg4 {-0.28/12 0.11s}
Qg2+ {+0.03/14 0.080s} 66. Kf5 {-0.21/11 0.070s} Qc2+ {+0.03/14 0.066s}
67. Kg5 {-0.09/12 0.34s} Qd3 {+0.03/14 0.092s} 68. Qf4+ {-0.06/10 0.067s}
Ke2 {+0.03/12 0s} 69. Qf5 {-0.06/10 0.081s} Qd2+ {+0.03/13 0.075s}
70. Qf4 {-0.03/11 0.17s} Qd8+ {+0.03/13 0.076s} 71. Kf5 {-0.03/10 0.064s}
Qd7+ {0.00/14 0.19s} 72. Ke5 {-0.03/11 0.15s} Qc7+ {+0.03/14 0.083s}
73. Ke4 {0.00/12 0.071s} Qb7+ {0.00/15 0.14s} 74. Kf5 {0.00/12 0.093s}
Qc8+ {0.00/14 0.072s} 75. Ke5 {-0.03/12 0.12s} Qb8+ {+0.03/15 0.098s}
76. Ke4 {-0.03/13 0.082s} Qb1+ {0.00/14 0.091s} 77. Ke5 {-0.01/12 0.14s}
Qb2+ {0.00/14 0.083s} 78. Kf5 {-0.03/12 0.071s} Qb6 {0.00/14 0.091s}
79. Qc4+ {0.00/9 0.053s} Kd2 {0.00/15 0.21s} 80. Ke5 {0.00/11 0.083s}
Qe3+ {0.00/14 0.089s} 81. Kd5 {0.00/14 0.10s} Qg3 {0.00/15 0.12s}
82. Kc6 {0.00/13 0.11s} Qf3+ {0.00/15 0.091s} 83. Kc5 {0.00/14 0.080s}
Qf8+ {0.00/16 0.11s} 84. Kb5 {+0.03/12 0.091s} Qb8+ {0.00/16 0.094s}
85. Ka4 {0.00/17 0.13s} Qb2 {0.00/17 0.14s} 86. Qc6 {0.00/12 0.10s}
Qc2+ {0.00/15 0.086s} 87. Qxc2+ {0.00/44 0.096s} Kxc2 {0.00/14 0.001s}
88. Kxa3 {0.00/58 0.089s} Kc3 {0.00/1 0s} 89. Ka4 {0.00/64 0.11s}
Kc4 {0.00/1 0s} 90. Ka5 {0.00/76 0.086s} Kc5 {0.00/1 0s} 91. a4 {0.00/91 0.095s}
Kc6 {0.00/1 0.016s} 92. Ka6 {0.00/99 0.067s} Kc7 {0.00/1 0s}
93. Ka5 {0.00/99 0.023s} Kd8 {0.00/1 0s} 94. Kb6 {0.00/99 0.086s}
Kc8 {0.00/1 0s, White's connection stalls} 0-1