28...Nf7?? [A fatal blunder that allows White to exploit Black's vulnerable king position by a spectacular combination.]
[28...Nc5! would be correct: 29.Rg1 Rg8 30.Rxg8 Qxg8 31.b4 Ncd7 32.Kb2 Qg5 33.Qh3 Nf8 34.h6 Qg8²]
29.Nxe6! [29.Bg4!? △N×e6 29...Nd8 30.Nxe6 Nxe6 31.Nd5+ Kf7 32.Bf5 △B×e6 32...Qh6 33.Bxe6+ Kxe6 34.Qh3+ Kf7 35.Qxd7++–]
29...Kxe6 30.Bg4+ [30.Qa7 Nc5 31.Bg4+ Ke7 32.Nd5+ Kf8 33.Nxf6 Qh6 34.Qb8+ Kg7 35.Ne8+ Kg8 36.Rg1+–]
30...Ke7 31.Qa7 Nd8 32.Nd5+ Kf8 33.Nxf6 Nxf6 34.Rxf6+ Ke8 35.Rxd6 Qxe4 36.Qb6 Qe1+ 37.Rd1 Qe7 38.Qg6+ Nf7 39.Rd7 Qe1+ 40.Ka2 1–0
[28...Nc5! would be correct: 29.Rg1 Rg8 30.Rxg8 Qxg8 31.b4 Ncd7 32.Kb2 Qg5 33.Qh3 Nf8 34.h6 Qg8²]
29.Nxe6! [29.Bg4!? △N×e6 29...Nd8 30.Nxe6 Nxe6 31.Nd5+ Kf7 32.Bf5 △B×e6 32...Qh6 33.Bxe6+ Kxe6 34.Qh3+ Kf7 35.Qxd7++–]
29...Kxe6 30.Bg4+ [30.Qa7 Nc5 31.Bg4+ Ke7 32.Nd5+ Kf8 33.Nxf6 Qh6 34.Qb8+ Kg7 35.Ne8+ Kg8 36.Rg1+–]
30...Ke7 31.Qa7 Nd8 32.Nd5+ Kf8 33.Nxf6 Nxf6 34.Rxf6+ Ke8 35.Rxd6 Qxe4 36.Qb6 Qe1+ 37.Rd1 Qe7 38.Qg6+ Nf7 39.Rd7 Qe1+ 40.Ka2 1–0
20.a5! [Before launching his attack on the kingside, White closes the queenside to limit his opponent's counterplay.]
[20.Nf1 bxa4!? 21.Bf4 Rb8 22.Bc1 Rab7 23.Qe3 Nc7 24.N1h2 Rxb2 25.Bxb2 Rxb2 26.Bxa4 Bxa4 27.Rxa4 Qf8 28.Rea1 h5 29.Qc1 Rb3 30.Rb1 Bh6 31.Qc2 Rxb1+ 32.Qxb1 Qb8 33.Qa1±; 20.Bf4 bxa4 21.Nf1 Rb8 22.Bxa4 Bxa4 23.Rxa4²]
20...b4 [Black tries to get some counterplay in the queenside.]
21.Bf4 Rb8 22.Qe3 [22.Nh2]
22...bxc3 23.bxc3 Rb2 24.Rec1 Nc7 25.Nf1 Nb5 26.N1h2 Qf8 27.Ba4 [27.Ng4 h5 28.Ngh2 Rb7 (28...Na3 29.Bd1) 29.g4±]
27...Rb7 28.h4 [28.Ng4! h5 29.Ngh2]
28...h5 29.Ng5 [29.g4! Qe8 30.Bc2 Qe7 31.gxh5 gxh5 32.Ng5 f6 33.exf6 Nxf6 34.Nhf3 Ng4 35.Qe1 Be8 36.Bh7+ Kh8 37.Rc2 Rb3 38.Re2 Bf7 39.Bd2±]
29...Nb8 30.g4 Na3 31.Bd1! hxg4 32.Nxg4 Nd7 33.Qh3 Qe7 34.h5 gxh5 35.Qxh5 f6 36.Qh7+ Kf8 37.Nh6 [37.Nh6! Ke8 (37...Bxh6 38.Qh8#) 38.Ng8 Nf8 (38...Qd8 39.Bh5+ Kf8 40.Nxe6#) 39.Qh5+ Kd8 40.Nxe7] 1–0
[20.Nf1 bxa4!? 21.Bf4 Rb8 22.Bc1 Rab7 23.Qe3 Nc7 24.N1h2 Rxb2 25.Bxb2 Rxb2 26.Bxa4 Bxa4 27.Rxa4 Qf8 28.Rea1 h5 29.Qc1 Rb3 30.Rb1 Bh6 31.Qc2 Rxb1+ 32.Qxb1 Qb8 33.Qa1±; 20.Bf4 bxa4 21.Nf1 Rb8 22.Bxa4 Bxa4 23.Rxa4²]
20...b4 [Black tries to get some counterplay in the queenside.]
21.Bf4 Rb8 22.Qe3 [22.Nh2]
22...bxc3 23.bxc3 Rb2 24.Rec1 Nc7 25.Nf1 Nb5 26.N1h2 Qf8 27.Ba4 [27.Ng4 h5 28.Ngh2 Rb7 (28...Na3 29.Bd1) 29.g4±]
27...Rb7 28.h4 [28.Ng4! h5 29.Ngh2]
28...h5 29.Ng5 [29.g4! Qe8 30.Bc2 Qe7 31.gxh5 gxh5 32.Ng5 f6 33.exf6 Nxf6 34.Nhf3 Ng4 35.Qe1 Be8 36.Bh7+ Kh8 37.Rc2 Rb3 38.Re2 Bf7 39.Bd2±]
29...Nb8 30.g4 Na3 31.Bd1! hxg4 32.Nxg4 Nd7 33.Qh3 Qe7 34.h5 gxh5 35.Qxh5 f6 36.Qh7+ Kf8 37.Nh6 [37.Nh6! Ke8 (37...Bxh6 38.Qh8#) 38.Ng8 Nf8 (38...Qd8 39.Bh5+ Kf8 40.Nxe6#) 39.Qh5+ Kd8 40.Nxe7] 1–0