davidpachecoiii vs KeSetoKaiba

How it swung

The one slip

26...♘d5 cost 4.6 pawns. ♘d1 would have held it.

That walks into 27.♕xe8+: the king on g8 and the rook on d8 are both attacked at once.

The score

1. 1. d4 d5
2. 2. c4 e6
3. 3. Nc3 Nf6
4. 4. cxd5 exd5
5. 5. Bg5 Be7
6. 6. e3 c6
7. 7. Qc2 Nbd7
8. 8. Bd3 h6
9. 9. Bh4 O-O
10. 10. Nge2 Ne8
11. 11. Bxe7 Qxe7
12. 12. e4 dxe4
13. 13. Nxe4 Nef6
14. 14. O-O Re8
15. 15. f3 Nf8
16. 16. Rae1 Ne6
17. 17. Nc5 Nxc5
18. 18. dxc5 Qc7
19. 19. Ng3 Be6
20. 20. b4 Rad8
21. 21. Be4 Bd5
22. 22. Bxd5 Nxd5
23. 23. a3 Ne3
24. 24. Qe2 Qe5
25. 25. f4 Qd4
26. 26. Rf2 Nd5
27. 27. Qxe8+ Rxe8
28. 28. Rxe8+ Kh7
29. 29. Kf1 Ne3+
30. 30. Ke2 Nc4
31. 31. Re4 Qb2+
32. 32. Kd3 Qb3+
33. 33. Ke2 Nxa3
34. 34. Re3 Qc2+
35. 35. Kf3 Qa4
36. 36. Ra2 Qd1+
37. 37. Ne2 Nc4
38. 38. Re7 Nd2+
39. 39. Kg3 Qe1+
40. 40. Kh3 Nc4
41. 41. Rxa7 Qxb4
42. 42. Raxb7 Qd2
43. 43. Ng3 Ne3
44. 44. Rxf7 Qxg2+
45. 45. Kh4 Qxh2#