arijw98 vs riyasusan

How it swung

The one slip

10...♕xd5 cost 17.9 pawns. ♘b4 would have held it.

That allowed mate. 11.♕xc7# is on the board.

The point: 11.♖c1 ♘xd5 12.♘xc7 ♘xc7

The score

1. 1. d4 d5
2. 2. Bh6 Nxh6
3. 3. e3 Nc6
4. 4. Nc3 Be6
5. 5. Nb5 Qd7
6. 6. Qh5 Bg4
7. 7. Qg5 f6
8. 8. Qf4 O-O-O
9. 9. c4 a6
10. 10. cxd5 Qxd5
11. 11. Nc3 e6
12. 12. Nxd5 exd5
13. 13. e4 Bb4+
14. 14. Qd2 Bxd2+
15. 15. Kxd2 dxe4
16. 16. Ke3 Nf5+
17. 17. Kxe4 Rhe8+
18. 18. Kf4 Nh6
19. 19. h3 g5+
20. 20. Kg3 Nxd4
21. 21. hxg4 Nxg4
22. 22. Kxg4 f5+
23. 23. Kxg5 Rg8+
24. 24. Kh6 Rg6+
25. 25. Kxh7 Rf6
26. 26. Rd1 Rd7+
27. 27. Kg8 Rd8+
28. 28. Kg7 Re6
29. 29. Kf7 Red6
30. 30. Nf3 R8d7+
31. 31. Ke8 Re6+
32. 32. Kf8 Kd8
33. 33. Rxd4 Re8#