9... Qh4
10. g3 Ng5
It was not necessary to move the knight, for 10...Bg4 11. Qf4 Qh5 12. Bxe4 dxe4 13. Qxe4 0-0-0 would be a promising pawn sacrifice.

11. Qd1 Nh3+
Black's previous move would make more sense after 11...Bxf2+ 12. Rxf2 Nh3+ 13. Kg2 Nxf2 14. gxh4 Nxd1 15. Be2 Nxb2 with a difficult ending.

12. Kg2 De7
13. f4
Now with a strong pawn center and black's knight out of play, white is fine.

13... h5
14. Nc3
White could have gone for the knight with 14. e6 Bxe6 15. f5, but he prefers a solid attack to a messy material advantage.

14... g5
15.f5 g4
16.Qe2 Bd7
At first sight 16...Bd4 looks good, but white has 17. Be3. Then 17...Bxe5 would lose material after 18. f6 and 17...Bxc3 18. bxc3 Qxe5 19. Rae1 0-0 20. Qd2 would give white a very strong attack.

17.Na4 Bb6
And here after 17...Bd4 white has 18. c3 Bxe5 19. f6 Qe6 20. Nc5 with excellent play.

18.b4 0‑0‑0
Or 18...Qxb4 19. Nxb6 followed by 20.e6 with a winning attack.

19.Nxb6+ axb6
20.a4 Re8
21.a5 bxa5
22.Bb2
Much stronger would have been 22.Rxa5, for after 22...Qxe5 (there is not much else that black can do) 23. Qxe5 Rxe5 23. Bb2 black would lose an exchange.

22... d5‑d4
The decisive mistake. 22...axb4 would also lose quickly after 23.e6 with the threat of 24.Qe5, but after 22...Qxb4 black would be still in the game. One variation is 23.Rfb1 c5 24.e6 Bc6 after which white has to choose between playing for a draw by repetition with 25.Bc1 and winning a dubious exchange after 25.Bf6 d4+ 26.Kf1 Qc3.

23.Ra1xa5
Now white's attack is irresistible.

23... Qe7xb4
24.Ra8+ Kc7
25.Ba3 c5
He has to give the queen. White finishes it off quickly.

26.Bxb4 Rxa8
27.e6 Bc6+
28.Be4 cxb4
29.Bxc6 bxc6
30.Qe5+ 0-1