adri_41 vs kiazo99

How it swung

The one slip

38...♘d6 cost 3.4 pawns. ♗a5+ would have held it.

The position went from winning to level.

The point: 39.♔c2 ♗e1 40.♘f4+ ♔g5

The score

1. 1. d4 d5
2. 2. c4 c6
3. 3. Nc3 Bf5
4. 4. Nf3 Nf6
5. 5. Bg5 e6
6. 6. e3 Bb4
7. 7. cxd5 cxd5
8. 8. a3 Ba5
9. 9. b4 Bc7
10. 10. Rc1 O-O
11. 11. Nb5 Bb6
12. 12. Bf4 Nc6
13. 13. Nd6 Rb8
14. 14. Nxf5 exf5
15. 15. Bd3 Ne4
16. 16. Bxb8 Qxb8
17. 17. O-O Bd8
18. 18. Qb3 Qd6
19. 19. b5 Ne7
20. 20. a4 g5
21. 21. Ne5 Nd2
22. 22. Qd1 Nxf1
23. 23. Kxf1 f6
24. 24. Nf3 g4
25. 25. Nd2 Qxh2
26. 26. g3 Qh1+
27. 27. Ke2 Qxd1+
28. 28. Kxd1 Kg7
29. 29. Nb3 b6
30. 30. a5 Kg6
31. 31. axb6 Bxb6
32. 32. Nc5 Rc8
33. 33. Ne6 Rxc1+
34. 34. Kxc1 h5
35. 35. Kd2 Nc8
36. 36. Nf8+ Kg5
37. 37. Ne6+ Kg6
38. 38. Kc3 Nd6
39. 39. Kb4 Ne4
40. 40. Bxe4 fxe4
41. 41. Nf8+ Kf5
42. 42. Nd7 h4
43. 43. Nxb6 axb6
44. 44. gxh4 Kg6
45. 45. Kc3 Kh5
46. 46. Kd2 Kxh4
47. 47. Ke1 Kh3
48. 48. Kf1 f5
49. 49. Kg1 g3
50. 50. fxg3 Kxg3
51. 51. Kf1 Kf3
52. 52. Ke1 Kxe3
53. 53. Kf1 Kxd4
54. 54. Ke2 Kc5
55. 55. Ke3 Kxb5
56. 56. Kd4 f4
57. 57. Kxd5 f3
58. 58. Kxe4 f2
59. 59. Kf3 f1=Q+
60. 60. Ke3 Qd1
61. 61. Kf2 Qd3
62. 62. Kg2 Qe3
63. 63. Kf1 Qd2
64. 64. Kg1 Qe2
65. 65. Kh1 Kc5
66. 66. Kg1 Kd5
67. 67. Kh1 Ke4
68. 68. Kg1 Kf3
69. 69. Kh1 Kg3
70. 70. Kg1 Qg2#