permanent_brain vs FischerBobbyJames

How it swung

The one slip

7...♘xe4 cost 1.9 pawns. exd4 would have held it.

That put the knight on e4, where the knight on c3 covers it. 8.♘xe4 just takes it.

The point: 8.♕xd4 ♘e5 9.♗f4 ♘xc4

The score

1. 1. d4 Nf6
2. 2. Nf3 d6
3. 3. Nc3 Bf5
4. 4. Nh4 Bc8
5. 5. e4 Nbd7
6. 6. Bc4 e5
7. 7. O-O Nxe4
8. 8. Qf3 Nef6
9. 9. Re1 Be7
10. 10. Nf5 O-O
11. 11. Bg5 Nb6
12. 12. Nxe7+ Qxe7
13. 13. dxe5 dxe5
14. 14. Ne4 Nxc4
15. 15. Nxf6+ gxf6
16. 16. Bxf6 Qe6
17. 17. Re4 Qf5
18. 18. Rxc4 Qxf3
19. 19. gxf3 c6
20. 20. Kh1 Bf5
21. 21. Rg1+ Bg6
22. 22. Bxe5 Rfe8
23. 23. f4 f6
24. 24. Bxf6 Kf7
25. 25. Be5 b5
26. 26. Rd4 c5
27. 27. Rd7+ Re7
28. 28. Rxe7+ Kxe7
29. 29. h4 Rd8
30. 30. h5 Be4+
31. 31. Kh2 Rd2
32. 32. Rg7+ Ke6
33. 33. Rxa7 Rxf2+
34. 34. Kg3 Rg2+
35. 35. Kh4 Bf5
36. 36. Rg7 Rxc2
37. 37. Rg3 h6
38. 38. Rc3 Rxb2
39. 39. Rxc5 Rxa2
40. 40. Rc6+ Kd5
41. 41. Rxh6 Rg2
42. 42. Rd6+ Ke4
43. 43. h6 b4
44. 44. Rd4+ Kf3
45. 45. Rxb4 Rg4+
46. 46. Kh5 Bg6#