cthulhutheold vs —

How it swung

The one slip

12.♘df3 cost 3.0 pawns. ♗xh7+ would have held it.

The position went from winning to level.

The point: 12...♔f8 13.f4 g6 14.h4

The score

1. 1. e4 c6
2. 2. d4 d5
3. 3. exd5 cxd5
4. 4. Bd3 Nc6
5. 5. c3 Nf6
6. 6. Bf4 e6
7. 7. Nf3 Bd6
8. 8. Bxd6 Qxd6
9. 9. Qe2 O-O
10. 10. Nbd2 Re8
11. 11. Ne5 Nd7
12. 12. Ndf3 Ndxe5
13. 13. Nxe5 Nxe5
14. 14. dxe5 Qc7
15. 15. O-O Bd7
16. 16. f4 g6
17. 17. Rf3 Bc6
18. 18. Rh3 Qe7
19. 19. Rf1 Rad8
20. 20. Rh6 d4
21. 21. c4 Qf8
22. 22. Rh4 f5
23. 23. Rh3 a6
24. 24. b3 Rb8
25. 25. a4 Qc5
26. 26. Rg3 b5
27. 27. cxb5 axb5
28. 28. axb5 Bxb5
29. 29. Kh1 Bxd3
30. 30. Rxd3 Rb4
31. 31. Qd2 Reb8
32. 32. Rc1 Qd5
33. 33. Qc2 Rxb3
34. 34. Rxb3 Qxb3
35. 35. Qxb3 Rxb3
36. 36. Rd1 d3
37. 37. h3 Rb4
38. 38. g3 Rd4
39. 39. Kg2 Kg7
40. 40. Kf3 d2
41. 41. Ke3 Ra4
42. 42. Rxd2 Ra3+
43. 43. Rd3 Ra7
44. 44. Rd2 h6
45. 45. h4 g5
46. 46. Rd6 gxf4+
47. 47. gxf4 Re7
48. 48. h5 Kf7
49. 49. Kd4 Ra7
50. 50. Kc5 Ra1
51. 51. Rd7+ Ke8
52. 52. Rh7 Rf1
53. 53. Kd6 Rxf4
54. 54. Kxe6 Kf8
55. 55. Rxh6 Rf1
56. 56. Rf6+ Kg7
57. 57. Rxf5 Ra1
58. 58. Rf6 Ra6+
59. 59. Kf5 Ra1
60. 60. h6+ Kh7
61. 61. Ke6 Ra6+
62. 62. Ke7 Ra7+
63. 63. Kd8 Ra8+
64. 64. Kd7 Ra7+
65. 65. Kd6 Ra6+
66. 66. Kd5 Ra5+
67. 67. Ke4 Ra4+
68. 68. Kf5 Ra1
69. 69. e6 Rf1+
70. 70. Ke5 Re1+
71. 71. Kd6 Rd1+
72. 72. Ke7 Ra1
73. 73. Kf7 Ra7+
74. 74. e7 Rb7
75. 75. Kf8 Rb8+
76. 76. e8=Q Rb7
77. 77. Qe7+ Rxe7
78. 78. Kxe7 Kh8
79. 79. Ra6 Kh7
80. 80. Kf7 Kh8
81. 81. Kg6 Kg8
82. 82. Ra8#