dkelty vs StepanZSI

How it swung

The one slip

38.♗e3+ cost 9.1 pawns. ♘f5 would have held it.

That did nothing about the knight on d6, hanging before the move and hanging after. 38...♔xd6 takes it.

The point: 38...♕d7 39.♕xf6 ♕xd3 40.♘e7

The score

1. 1. e4 e5
2. 2. Nc3 Nf6
3. 3. d4 exd4
4. 4. Qxd4 Nc6
5. 5. Qd3 Nb4
6. 6. Qd1 c5
7. 7. e5 Ng8
8. 8. a3 Nc6
9. 9. Nf3 h6
10. 10. Bb5 a6
11. 11. Bxc6 bxc6
12. 12. O-O d6
13. 13. Re1 Be6
14. 14. Ne4 d5
15. 15. Ng3 d4
16. 16. b4 g5
17. 17. h3 g4
18. 18. hxg4 Bxg4
19. 19. e6 fxe6
20. 20. Re4 Nf6
21. 21. Rxg4 Nxg4
22. 22. Qe1 Qe7
23. 23. bxc5 Bg7
24. 24. Qe4 d3
25. 25. Qxc6+ Kf7
26. 26. cxd3 Bxa1
27. 27. Qe4 h5
28. 28. Qf4+ Nf6
29. 29. Ng5+ Kf8
30. 30. N5e4 e5
31. 31. Qg5 Rg8
32. 32. Qh6+ Kf7
33. 33. Nf5 Rg6
34. 34. Nfd6+ Ke6
35. 35. Qxg6 Rg8
36. 36. Ng5+ Kd5
37. 37. Qh6 Kxc5
38. 38. Be3+ Kxd6
39. 39. Ne4+ Ke6
40. 40. Nc5+ Kf5
41. 41. Ne4 Rg6
42. 42. Ng3+ Ke6
43. 43. Qxg6 e4
44. 44. Qf5+ Kf7
45. 45. Nxh5 exd3
46. 46. Qg5 Ke6
47. 47. Ng7+ Kd7
48. 48. Qf5+ Kc6
49. 49. Qc8+ Kb5
50. 50. Qf5+ Kc6
51. 51. Ne6 Nd5
52. 52. Nd4+ Bxd4
53. 53. Bxd4 d2
54. 54. Qc2+ Kd6
55. 55. Bc5+ Kc6
56. 56. Bxe7+ Kb5
57. 57. Qxd2 Nf4
58. 58. Qb4+ Kc6
59. 59. Qxf4 a5
60. 60. Qd6+ Kb5
61. 61. Qc5+ Ka4
62. 62. Qc4#