Knight/Bishop Ending

[kingliveson]

[Event "Computer Chess Game"]
[Site "openSUSE"]
[Date "2011.12.19"]
[Round "1"]
[White "Critter 1.2 64-bit SSE4"]
[Black "IvanHoe 9.46b x64"]
[Result "0-1"]
[TimeControl "3600"]
[Annotator "1. +0.17 1... +0.15"]

1. d4 {+0.17/22} Nf6 {+0.15/23 2:34} 2. Nc3 {+0.10/22 4:49} e6
{+0.07/23 0.1} 3. e4 {+0.08/21 2:01} d5 {+0.06/23 0.1} 4. exd5
{+0.07/20 1:56} exd5 {+0.03/23 3:31} 5. Nf3 {+0.07/20 30} Bd6 {+0.07/23 33}
6. Bd3 {+0.08/21 1:18} O-O {+0.07/24 0.1} 7. O-O {+0.05/22 1:47} h6
{+0.11/23 2:01} 8. Re1 {+0.08/21 1:43} Nc6 {+0.07/23 3:36} 9. a3
{+0.07/21 1:48} Bg4 {-0.09/24 2:06} 10. Be3 {+0.00/21 1:25} Qd7
{-0.08/24 0.1} 11. Nb5 {+0.00/21 1:29} Rfe8 {-0.09/22 1:53} 12. Nxd6
{-0.01/20 1:43} Qxd6 {-0.09/23 0.1} 13. c3 {+0.00/21 1:24} Bh5
{-0.16/21 1:34} 14. Rc1 {-0.06/18 1:27} Re7 {-0.12/22 3:05} 15. Qb3
{+0.00/21 1:18} Bxf3 {-0.23/23 0.1} 16. gxf3 {-0.03/20 27} b6
{-0.12/24 7:10} 17. Qa4 {+0.00/23 0.1} Na5 {-0.12/23 31} 18. Bd2
{+0.00/22 1:58} Rae8 {-0.21/23 1:16} 19. Re3 {-0.07/23 0.1} Qd7
{-0.25/23 32} 20. Qxd7 {-0.07/23 36} Nxd7 {-0.25/24 0.1} 21. Rxe7
{-0.07/23 1:04} Rxe7 {-0.22/24 56} 22. Bf4 {-0.09/23 18} Nf8
{-0.21/24 2:29} 23. Kf1 {-0.07/22 1:44} g5 {-0.29/23 53} 24. Bg3
{+0.00/22 44} Nc4 {-0.23/25 26} 25. Bxc4 {-0.05/24 58} dxc4 {-0.18/27 0.1}
26. Re1 {-0.04/25 56} Rxe1+ {-0.21/28 0.1} 27. Kxe1 {-0.04/22 0.1} Ne6
{-0.21/28 1:02} 28. Kd2 {-0.10/24 39} f5 {-0.21/27 0.1} 29. Be5
{-0.09/26 52} c6 {-0.20/25 27} 30. f4 {-0.25/25 50} g4 {-0.44/29 0.1} 31.
Ke2 {-0.35/25 1:02} h5 {-0.52/26 1:16} 32. Bb8 {-0.41/26 41} a6
{-0.58/27 43} 33. f3 {-0.48/25 54} Nf8 {-0.61/27 50} 34. Kf2 {-0.56/24 42}
b5 {-0.90/27 47} 35. fxg4 {-0.66/27 55} hxg4 {-1.06/29 0.1} 36. h3
{-0.66/27 26} gxh3 {-0.99/30 0.1} 37. Kg3 {-0.91/30 2:56} Nd7
{-0.99/32 0.1} 38. Ba7 {-0.91/29 30} Nf6 {-0.99/31 0.1} 39. Kxh3
{-0.91/28 29} Nd5 {-0.99/30 0.1} 40. Kh4 {-0.91/27 28} Kf7 {-1.27/28 0.1}
41. Bc5 {-0.91/26 27} Ke6 {-1.42/26 0.1} 42. Kg3 {-0.95/25 26} Ne3
{-1.42/27 0.1} 43. a4 {-0.95/26 24} a5 {-1.87/23 58} 44. Bf8 {-1.44/21 36}
Nd5 {-2.36/23 46} 45. Kf3 {-1.95/22 30} Kd7 {-2.52/23 0.1} 46. Ke2
{-2.67/20 39} Nxf4+ {-3.92/20 17} 47. Kd2 {-3.82/21 16} bxa4 {-4.85/23 0.1}
48. Ba3 {-5.23/22 26} Nd3 {-5.97/23 0.1} 49. Ke3 {-5.59/21 13} f4+
{-7.04/21 20} 50. Kf3 {-6.08/23 25} Ke6 {-7.32/22 0.1} 51. Ke2
{-6.76/21 17} Kf6 {-9.17/23 1:06} 52. Kf1 {-7.76/21 16} f3 {-10.44/22 48}
53. Bd6 {-9.17/19 16} Nxb2 {-13.13/23 2:30} 54. d5 {-12.33/19 31} cxd5
{-15.55/20 30} 55. Ke1 {-14.18/21 0.1} Nd3+ {-17.85/21 36} 56. Kf1
{-17.88/20 14} a3 {-18.31/21 0.1} 57. Bxa3 {-18.47/19 7} Ke5 {-19.48/22 19}
58. Kg1 {-99.52/20 38} Ke4 {-23.31/19 24} 59. Kf1 {-99.64/23 8} f2
{-25.75/19 10} 60. Ke2 {-99.66/19 4} a4 {-99.69/19 12} 61. Bb2
{-99.72/23 6} Nxb2 {-99.85/22 32} 62. Kxf2 {-99.86/56 0.1} a3 {-99.87/22 8}
63. Kg3 {-99.88/56 0.4} a2 {-99.89/22 10} 64. Kg4 {-99.90/56 0.1} a1=Q
{-99.91/22 21} 65. Kg5 {-99.92/56 0.1} Qa6 {-99.93/21 13} 66. Kg4
{-99.94/56 0.1} Qg6+ {-99.95/21 22} 67. Kh4 {-99.96/56 0.1} Kf4
{-99.97/22 12} 68. Kh3 {-99.98/56 0.1} Qg3# {-99.99/125 0.1}
{Xboard adjudication: Checkmate} 0-1

This was a single-core (AMD Phenom @ 3000 MHz), 1024 MB hash, ponder-on, 60 minute game with egtb-off. I wonder if the game was truly lost after move 26:

5nk1/p1p2p2/1p5p/6p1/2pP4/P1P2PB1/1P3P1P/4K3 b - - 0 27