13.h4!?
Diagram
13...Nb6?
A pretty lazy and careless move which leaves Black unable to play for a win. Instead simply b6 suggested itself with an interesting game ahead.
14.c5
Nbc4
15.Bh6
dxc5
Pretty much forced [15...Re8?
16.Qa4
And Black losses material]
16.Bxf8
Qxf8
17.Qa4
Qe8
This is the key move that Black does not have avalable to him if he had played Re8 instead of dxc5
18.Qxe8+
Rxe8
19.Bxc4
Nxc4
20.Ke2
Nd6
21.f3
Kg7
22.g4
Kh6
A funny move the idea of which is that if White plays H5 then Kg5 while if g5 then the very curious move Kh5 is available.
23.Rab1
b6
24.a4
a5
25.Rhf1
Kg7
26.Rh1
c4
If Black only wanted to draw it would be better not to play this as the only reason for this move is to keep alive some hopes of complicating matters.
27.h5
Kf6
28.Ke3
Kg5
29.Rb2
Nb7
30.hxg6
hxg6
31.Rb5
Clever move which underscores the fact that White is only interested in playing for a draw but is mindful that Black might be tempted to play for a win and take risks.
31...Nd6
[31...f6??
32.Rh7
]
32.Rb2
Rd8
33.Rh7
Rf8
34.Rh1
Nb7
35.Rb5
Nd6
36.Rb2
Rc8
37.Rh7
Ra8
38.Rb1
Clearly White is happy with a draw but Black is not and so Black now takes big risk.
38...Kf6?
Black is now lost but can at least try to confuse his opponent.
39.f4!
exf4+
40.Kd4
[40.Kxf4
Actually is fine ]
40...Re8
41.Re1
Kg5
42.e5
f3
Quite funny
43.Rf1?
Still winning but not the best move. [43.exd6
Rxe1
44.d7
f6
45.Rh2!
(45.d8Q?
f2
46.Qf8
f1Q
47.Qh6+
Wins but allows scope for going wrong) ]
43...Kf4
Apparently this is the move White overlooked and thus being a bit spooked fails to play the winning move now.
44.Rh3
Kxg4
45.Rhxf3?
[45.exd6!
f5
46.Kxc4
Kxh3
47.dxc7
Kg2
48.d6
Rc8
49.Rxf3
Kxf3
50.Kd4
Wins]
45...Nf5+
46.Ke4
Nd6+
[46...Ng3+
47.Rxg3+
Kxg3
48.Rxf7
Wins for White]
47.Kd4
Nf5+
And White has no choice but to repeat the position.
48.Ke4
Nd6+
1/2-1/2