Rough record of thoughts during the game:

1. e4 d5 2. exd5 Nf6 3. Nc3 Nxd5 4. Nf3 Bg4 5. Be2 e6 6. O-O Be7 7. Nxd5 exd5 8. d4 O-O 9. h3 Bh5 10. Be3 Nd7 11. c3 Nf6 12. Re1 Ne4 In hindsight, too many time-wasting moves, such as with this knight, contributed to my later problems holding his position together on the e-file. 13. Ne5 Bxe2 14. Qxe2 Bf6 15. Ng4 c6 Intended to prevent Qb5. 16. Nxf6+ Qxf6 17. Qg4 Rfe8 18. Re2 Qe6 19. Rae1 Qxg4 20. hxg4 Kf8 21. Bf4 Nf6 22. Be5 This is the move that I really didn't foresee back when I exchanged queens and though I could hold the e-file. There are tactical dangers near. 22... Ne4 The only square this knight could go to try to shut down the e-file. 22... Nxg4? loses the exchange and probably more after 23. Bxg7+ Kxg7 24. Rxe8 Rxe8 25. Rxe8 23. g5 During the game I felt that White could win at least a pawn with 23. f3 f6 23... f6 24. gxf6 gxf6 25. Bf4 Kf7 I started to breath easier. Now there are no more threats based on a bishop check on d6 or a removal of the guard on e8. 26. f3 Ng5 27. Kf2 Rxe2+ I felt that exchanging one pair of rooks would ease my defense along the e-file. 28. Rxe2 Ne6 I decided against 28... Re8 because after 29. Bxg5 fxg5 30. Rxe8 Kxe8 31. Kg3 White's king is better positioned. 29. Bd6 Rd8 30. Bh2 Ng5 31. g4 Rg8 Thinking about penetrating via g6 and h6. 32. Bd6 Threatening to penetrate via Re7+, which cannot be allowed. I decided that I could now allow a rook exchange on e8, because my calculations indicated that with my king on d6 and f7, knight checks could keep White's king from penetrating on the queenside. 32... Re8 33. Rxe8 Kxe8 34. Kg3 Kd7 35. Bf4 Ke6 36. Be3 Kf7 37. b3 b5 38. Kf4 Ne6+ 39. Kg3 After 39. Kf5 Ng7+ 40. Kf4 Ne6+ 41. Kg3 Ng5 White has made no progress. 39... Ng5 The knight needs to go back to g5 to be able to play Ne4 if White plays f4. Despite the rule-of-thumb that a bishop is better than a knight in the endgame when there are pawns on both sides, my knight seems better here. 40. Bd2 Kg6 41. Bf4 Kf7 Patiently shuffling back and forth. I had decided that there was no opportunity for a win without some error by White, but I could lose if I tried to make something happen. 42. Bb8 a6 43. Kf4 Ne6+ 44. Ke3 White continues to probe, trying to find a breakthrough. I got the impression here that White would continue to try to win. 44... Ng5 45. Bg3 Ke6 46. Be1 Kf7 Shuffle, shuffle. 47. f4?! A nice gift of e4. Here I felt things were turning my way. 47... Ne4 48. Kd3 Looks like White's going to try to break through on the kingside, but he's given me the opportunity for a breakthrough on the queenside. 48... Kg6 49. Bh4 h5 50. gxh5+ Kxh5 51. Be1 Kg4 52. Ke3 Ng3! White's bishop has been outmaneuvered and his f-pawn will fall. 53. c4 Nh5 54. cxb5 cxb5 55. Bb4 Nxf4 56. Bd6 Ne6 57. Be7 f5 58. Bf6 f4+ 59. Kd3 Kg3 60. Be5 Kg2 61. Bxf4 Nxf4+ 62. Ke3 Ne6 63. Kd3 a5 0-1