Strange loss

[Hurnavich]

[pgn][Event "Komodo 11.2 LTC vs SF 150717 MP,"]
[Site "Hurnavich-PC"]
[Date "2017.07.19"]
[Round "7"]
[White "Komodo 11.2 64-bit LTC"]
[Black "Stockfish 150717 MP"]
[Result "0-1"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7
9. Ne1 Nd7 10. Nd3 f5 11. Bd2 Nf6 12. f3 f4 13. g4 g5 14. Be1 h5 15. h3 Ng6
16. c5 Kf7 17. Rc1 Rh8 18. Bf2 hxg4 19. hxg4 Nh5 20. Kg2 Ng3 21. Bxg3 fxg3
22. Kxg3 dxc5 23. Nxc5 Nf4 24. Rh1 Rxh1 25. Qxh1 Qd6 26. Qg1 b6 27. Nd3 Bd7
28. Rc2 Rh8 29. Bf1 Rh4 30. Rh2 Qf6 31. Qe3 Bf8 32. Rxh4 gxh4 33. Kh2 Nxd3
34. Bxd3 Bc5 35. Qe2 Qf4 36. Kh1 Qc1 37. Nd1 Qf4 38. Qf1 Bd4 39. Be2 Qd2 40. b3
Qxa2 41. Qe1 Be8 42. Bc4 h3 43. Qe2 Qxe2 44. Bxe2 a5 45. Kh2 c5 46. dxc6 Bxc6
47. Kxh3 Bd7 48. Bd3 b5 49. Kg3 a4 50. bxa4 bxa4 51. f4 Be6 52. Kf3 a3 53. Bb1
a2 54. Bxa2 Bxa2 55. g5 exf4 56. Kxf4 Bb1 57. Ne3 Ba2 58. Nd1 Bb1 59. Ne3 Ke6
60. Nd5 Ba2 61. Kf3 Bb1 62. Kf4 Ba2 63. Nc7 Kf7 64. Nd5 Kg6 65. Ne7 Kh7 66. g6
Kh8 67. Nf5 Bc3 68. e5 Kg8 69. Kg5 Bxe5 70. Nh6 Kg7 71. Nf5 Kf8 72. Nh6 Bc3
73. Nf5 Bb1 74. Kf4 Bf6 75. Kg4 Ke8 76. Kf4 Kd7 77. g7 Ba2 78. Ke3 Bg8 79. Ke4
Ke6 80. Nd4 Kf7 81. Kd5 Kxg7 82. Ke4 Kf7 83. Kd5 Ke7 84. Ke4 Kd6 85. Nf5 Kc6
86. Ne3 Bh7 87. Nf5 Kd7 88. Kf4 Ke6 89. Ne3 Be5 90. Kf3 Bc7 91. Ng4 Bg6 92. Nf2
Kd5 93. Ke3 Bb6 94. Kf3 Bh5 95. Kg3 Bc7 96. Kh4 Bg6 97. Kg5 Bc2 98. Kg4 Kd4
99. Nh3 Ba4 100. Ng5 Bd7 101. Kf3 Ke5 102. Kg2 Kf4 103. Nh3 Ke3 104. Ng5 Ke2
105. Nh3 Bc6 106. Kg1 Be5 107. Ng5 Bd4 108. Kh2 Bf6 109. Nh7 Be7 110. Kg3 Be4
111. Nf8 Bxf8 112. Kf4 Kd3 113. Ke5 Ke3 114. Ke6 Kf4 115. Kd7 Ke5 116. Kc7 Bc5
117. Kd7 Kd5 118. Kc7 Bf5 119. Kb7 Kd6 120. Ka6 Kc6 121. Ka5 Bc2 122. Ka6 Bb4
123. Ka7 Kc7 124. Ka6 Bd3 125. Ka7 Bc5 126. Ka8 Be4# 0-1[/pgn]

[cdani]

Why do you think is strange?

[AlvaroBegue]

Why do you think is strange?

On move 56 white has a knight and two pawns, while black has two bishops. Did you expect the bishops to end up capturing everything and then winning?
It does look strange to me too, but perhaps that's just because I am a weak player.

[MikeB]

The game is an egtb 6 man draw after 56.Kxf4.

[tpoppins]

A 7-men draw. Can be found in seconds with 6-men Syzygy, though:

Code: Select all

Analysis by Stockfish 090717 64 POPCNT ASM:

...
56...Ke6 57.Ne3 Be5+ 58.Kf3 Bb3 59.Nd5 Ba4 60.Ke3 Bb2 61.Nf4+ Kd6 62.g6 Bc1+ 63.Kf3 Bd1+ 64.Kg3 Bb2 65.Nd3 Bg7 66.Kf4 Be2 67.Nb4 Ke6 68.Kg5 Ke5 69.Nc6+ Kd6 70.Nb4 Ke6 71.Nd5 Ke5 72.Ne3 Bf3 
  -/+ (-0.73)  Depth: 24/38   00:00:04  10874kN, tb=306075
56...Ke6 
  =/+ (-0.68 ++)  Depth: 25/42   00:00:04  16405kN, tb=428792
56...Ke6 57.Ne3 
  =/+ (-0.56 --)  Depth: 25/42   00:00:04  17239kN, tb=444004
56...Ke6 57.Ne3 
  =/+ (-0.35 --)  Depth: 25/42   00:00:04  21682kN, tb=542770
56...Ke6 57.Ne3 
  = (-0.07 --)  Depth: 25/47   00:00:05  29007kN, tb=720824
56...Ke6 57.Ne3 Be5+ 58.Kf3 Bd6 59.g6 Be5 60.Ng4 Bg7 61.Ne3 Bb1 62.Nf5 Bc3 63.g7 Kf7 64.Kf4 Bd2+ 65.Ke5 Ba2 66.g8R Kxg8 
  = (0.00)  Depth: 25/47   00:00:05  29131kN, tb=723736
...
56...Ke6 57.Ne3 Be5+ 58.Kf3 Bb3 59.Nd5 Bd6 60.g6 Bf8 61.Ne3 Bh6 62.Ke2 Ba2 63.Nf5 Bc1 64.Kd3 Ke5 65.g7 Bg5 66.Nd4 Bf6 67.Nc6+ Kf4 68.Nb4 Bb1+ 69.Kc4 Bxg7 
  = (0.00)  Depth: 115/47   00:02:28  4388MN, tb=110101485

It takes 600X the node count and more than twice the depth to do the same with 5-men Syzygy:

Code: Select all

...
56...Ke6 57.Ne3 Be5+ 58.Kf3 Bb1 59.g6 Bd3 60.Nd5 Bc2 61.Ne3 Ba4 62.Kg4 Bb2 63.Kf3 Be8 64.Nd5 Kd6 65.Nf4 Bg7 66.Kg4 Bh6 67.Ng2 Ke6 68.Nh4 Bd7 69.Kh5 Bc1 70.Nf5 Kf6 71.g7 Be6 72.Kg4 Bd2 73.Kf3 Bg5 74.Nd4 Bf7 75.Nf5 Bd2 76.Kg4 Bc1 77.Kf3 Bb2 78.Kg4 Bb3 79.Kf4 Be5+ 80.Ke3 Kf7 81.Nd4 Ba2 82.g8R Kxg8 83.Nc6 Bb2 84.e5 Bb1 85.e6 Kf8 86.e7+ Ke8 87.Nb4 Bc3 88.Nd5 Be5 89.Nb4 Bf5 90.Nd5 Bg6 91.Nb6 Bb1 92.Nc4 Bg7 93.Nb6 Bh7 94.Nd5 Be5 95.Nb4 
  -/+ (-1.35)  Depth: 58/81   00:01:10  2457MN, tb=18504071
56...Ke6 57.Ne3 
  -/+ (-1.28 --)  Depth: 59/81   00:01:37  3451MN, tb=23741629
56...Ke6 57.Ne3 
  -/+ (-1.21 --)  Depth: 59/83   00:02:44  5846MN, tb=34850451
56...Ke6 57.Ne3 
  -/+ (-1.10 --)  Depth: 59/83   00:03:26  7469MN, tb=38220536
56...Ke6 57.Ne3 
  -/+ (-0.95 --)  Depth: 59/83   00:04:04  8951MN, tb=40607180
56...Ke6 57.Ne3 
  -/+ (-0.74 --)  Depth: 59/83   00:04:52  10808MN, tb=44171504
56...Ke6 
  -/+ (-0.90 ++)  Depth: 59/83   00:05:19  11878MN, tb=46522611
56...Ke6 57.Ne3 
  =/+ (-0.68 --)  Depth: 59/83   00:05:53  13171MN, tb=49662027
56...Ke6 57.Ne3 
  = (-0.19 --)  Depth: 59/83   00:07:06  15991MN, tb=54604342
56...Ke6 57.Ne3 Bb3 58.g6 Kf6 59.Ng4+ Kg7 60.e5 Kxg6 61.e6 Ba4 62.e7 Be8 63.Ne5+ Kf6 64.Nf3 Bc5 65.Ke4 Bc6+ 66.Kd3 Bb5+ 67.Ke4 Bxe7 
  = (0.00)  Depth: 59/86   00:08:18  18713MN, tb=62305545
...
56...Ke6 57.Ne3 Bb3 58.g6 Kf6 59.Ng4+ Kg7 60.e5 Kxg6 61.e6 Ba4 62.e7 Be8 63.Ne5+ Kf6 64.Nf3 Bc5 65.Ke4 Bc6+ 66.Kd3 Bb5+ 67.Ke4 Bxe7 
  = (0.00)  Depth: 64/86   00:08:23  18875MN, tb=62938131

So yeah, strange loss, strange game, strange tournament.

[Lyudmil Tsvetkov]

Why do you think is strange?

On move 56 white has a knight and two pawns, while black has two bishops. Did you expect the bishops to end up capturing everything and then winning?
It does look strange to me too, but perhaps that's just because I am a weak player.

pair of bishops frequently win against knight + 3(!) isolated pawns.

[Lyudmil Tsvetkov]

The game is an egtb 6 man draw after 56.Kxf4.

that does not mean you can not win it in a timed game.

[cdani]

The game is an egtb 6 man draw after 56.Kxf4.

that does not mean you can not win it in a timed game.

Yes. I have studied a little KBBKN imbalance (plus some pawns) and in I left in Andscacs advantage for the bishops, as many times is a win or can be won as the rival engine cannot find the perfect defense.

[duncan]

A 7-men draw. Can be found in seconds with 6-men Syzygy, though:

do you know when white blundered?

[Hurnavich]

Move 87...Kd7 was seen as 0.00 but when played white looses see eval

If 87.Kf4 played the follow up shows 87...Kc5 as 0.00 but when played shows white as loosing.

Loading up Texel using same Syzygy at move 92. wants to play Ne3 and looks like white would be saved.