lashielshound vs xr480vx

How it swung

The one slip

15.♔h2 cost 4.7 pawns. ♕a4+ would have held it.

That walks into 15...♘fxg4+: the king on h2 and the bishop on e3 are both attacked at once.

The point: 15...♘c6 16.♖ab1 ♕d7 17.b4

The score

1. 1. c4 c5
2. 2. Nc3 Nf6
3. 3. g3 Nc6
4. 4. Bg2 Ne5
5. 5. e4 d6
6. 6. d3 h6
7. 7. Nge2 Bg4
8. 8. h3 Bh5
9. 9. O-O Bf3
10. 10. Be3 Bxg2
11. 11. Kxg2 g5
12. 12. f4 gxf4
13. 13. Nxf4 Rg8
14. 14. g4 e6
15. 15. Kh2 Nfxg4+
16. 16. hxg4 Qh4+
17. 17. Kg2 Rxg4+
18. 18. Qxg4 Nxg4
19. 19. Rh1 Nxe3+
20. 20. Kf3 Qg5
21. 21. Rag1 Qe7
22. 22. Kxe3 O-O-O
23. 23. Rg8 d5
24. 24. cxd5 exd5
25. 25. Nfxd5 Rxd5
26. 26. Nxd5 Qd6
27. 27. Rhg1 h5
28. 28. R1g5 h4
29. 29. Rh5 Qh2
30. 30. Rxf8+ Kd7
31. 31. Rxf7+ Ke6
32. 32. Re7+ Kd6
33. 33. Rh6#