healingthrone77 vs Chucmunnonmoi

How it swung

The one slip

17.♖e1 cost 3.2 pawns. b4 would have held it.

That walks into 17...♖xe1+: the king on g1 and the queen on d1 are both attacked at once.

The point: 17...♕xc3 18.bxa5 ♕xa5 19.♕b3

The score

1. 1. e4 d5
2. 2. d4 e6
3. 3. exd5 Nf6
4. 4. Bg5 h6
5. 5. Bxf6 Qxf6
6. 6. dxe6 Bxe6
7. 7. Nf3 Bb4+
8. 8. c3 Ba5
9. 9. Be2 O-O
10. 10. O-O Re8
11. 11. Nbd2 Nd7
12. 12. Ne4 Qg6
13. 13. Bd3 Bf5
14. 14. Nc5 Nxc5
15. 15. Bxf5 Qxf5
16. 16. dxc5 Qxc5
17. 17. Re1 Rxe1+
18. 18. Qxe1 Qd6
19. 19. Rd1 Qf6
20. 20. Nd2 Rd8
21. 21. Ne4 Qe7
22. 22. Rxd8+ Qxd8
23. 23. Nc5 b5
24. 24. Nb7 Qc8
25. 25. Nxa5 c5
26. 26. h3 Qd8
27. 27. Nc6 Qd7
28. 28. Qe4 f5
29. 29. Qf3 g5
30. 30. Ne5 Qe6
31. 31. Qa8+ Kg7
32. 32. Qxa7+ Kf6
33. 33. Nd7+ Kg6
34. 34. Nxc5 Qe1+
35. 35. Kh2 Qxf2
36. 36. Qb6+ Kh5
37. 37. Qd6 Qxb2
38. 38. Ne6 Qxa2
39. 39. Ng7+ Kh4
40. 40. Qxh6#