Krush-Estrada Nieto
Oakham 2001
Notes by GM John Emms

1 e4 e5 2 Nf3 Nc6 3 Bb5 a6 4 Ba4 Nf6 5 0-0 b5 6 Bb3 Bc5 7 c3 d6 8 a4 Bb7 9 d4 Bb6 10 Re1 0-0 11 Bg5 h6 12 Bh4 g5
Certainly playable, but this move always involves some risk. Safer is 12...Re8 or 12...exd4 13 cxd4 g5 14 Bg3 Re8 15 axb5 axb5 16 Rxa8 Bxa8 17 d5 Ne7 18 Nc3 as in Ivanchuk-Tkachiev, Budapest 1999.
13 Nxg5!?
Going all in, which is very much Krush's style. Theory prefers 13 Bg3, but this is certainly less worrisome for Black.
13...hxg5 14 Bxg5 exd4 15 Bd5
Before this theory had only considered 15 Qf3 for example 15...Kg7 16 Qg3 (16 e5? Nxe5 17 Qxb7 dxc3 18 axb5 Ra7 19 Qd5 Nxd5 20 Bxd8 c2 21 Na3 Rxd8 22 Bxd5 Nd3 was very strong for Black in Diaz-Rodriguez, Cienfuegos 1983, the only other game I can find with 13 Nxg5) 16 ..Qd7 17 Bxf6+ Kxf6 18 Qh4+ Kg6 19 Qg3+ is a draw by perpetual check.
15...Kg7
Adding extra support to f6. 15 ..dxc3 16 Nxc3 only helps White to develop.
16 cxd4 Qd7 17 Ra3!
An imaginative use of the a1-rook. White's attack is beginning to gain momentum.
17...Nh7
It would be nice to exchange a piece with 17 ..Nxd5 but 18 exd5 Nxd4 19 Rg3 Nf5 20 Qg4 looks terminal for Black, as there is no good defence against a deadly discovered check.
18 Rg3
18 Qh5 also looks very strong, but following 18 ..f6 19 Bh6+ Kh8 20 Bxf8 Rxf8 Black is surviving.
18...Kh8
18...Nxg5 19 Rxg5+ Kf6 still looks very unclear to me. The black king is threatening to run away via the e7-square. 20 e5+!? Kxg5 (20 ..dxe5 21 dxe5+ Ke7 22 e6 keeps the attack going.) 21 Qd2+ Kg6 22 Be4+ and my computer says this is a draw by perpetual check, as 22 ..f5 23 exf6+ Kxf6 24 Qh6+ gives White a wiining attack.
19 Qh5 Bxd4
Or:
a) 19...f6 20 Bh6 Bxd4 21 Qg6 Ng5 22 Bxg5 wins for White.
b) 19...f5 20 Bh6! (20 exf5? Qxf5) 20 ..f4 (20 ..Bxd4 21 Qg6! and Black has no good defence to the threats of e5 and Bxf8) 21 Bg7+ Qxg7 22 Rxg7 Kxg7 23 e5 and White has a queen and two pawns for a rook and two minor pieces. Significantly, though, White still has a dangerous attack.
20 e5 Bxe5?
This loses immediately. Black has two better defences:
a) 20...f5 21 e6 (21 exf6 Qf5 keeps Black alive) 21 ..Qe8 22 Qh4 Be5 23 Rh3 Qg6 24 Rc1 and White's attack is still very strong.
b) 20...f6? 21 Bxf6+ Rxf6 22 exf6 Bxf6 23 Be4 and White will follow up with Rh3.
21 Bf6+!!
Critically blocking the f7-pawn.
21 ..Bxf6 22 Be4 1-0
There is no defence to Qxh7 mate.