1.e4
c5
2.Nf3
e6
3.d4
cxd4
4.Nxd4
Nc6
5.Nc3
d6
6.Be2
Nf6
7.0-0
Be7
8.Be3
0-0
9.f4
e5
This variation used to be fashionable quarter of century ago. It made part of the repertoire of such players like Ulf Andersson and a very young Garry Kasparov. By the way, they also reached this position via Paulsen move order.
10.Nxc6
[Not a very popular continuation. In the days of highest popularity of this line, the main directions of investigations consisted of 10.Nb3
exf4
11.Rxf4
Be6
reaching a position typical for the Najdorf variation but with the minor difference that the black a-pawn finds itself on its initial square and; 10.fxe5
dxe5
11.Nf5
. As we shall see, Kamsky followed his own footsteps.]
10...bxc6
In spite of ensuring Black a good control of the central squares, the pawn tandem c6-d6 an easily become the object of attack of White's pieces.
11.Kh1
exf4
[Refraining from this exchange for too long proved to be sangerous for Black after 11...Be6
12.Bf3
Bc4
13.Re1
Nd7
14.b3
Ba6
15.f5
Nf6
16.g4
in Kamsky-Khalifman, Las Vegas FIDE KO 1999.]
12.Bxf4
Be6
13.Bf3
Qb6
14.b3
Rfd8
[Not a very inspired novelty. The king side will remain vulnerable now. In a recent game, 14...Rad8
was tried: 15.Qe1
Kh8
(Not easy to understand. 15...Rfe8
, completing the development, looks more natural.) 16.Rd1
Qa5
17.Bd2
Qe5
18.Ne2
d5
19.Bf4
Qb2
20.e5
Ne4
21.Nd4
Bc5
22.Nxe6
fxe6
23.Bxe4
dxe4
24.Qxe4
Rxd1
25.Rxd1
Qxa2
26.h3
with a better coordination of White's pieces in Xu Yuhua-Kovalevskaya, Ekaterinburg 2006.]
15.Qe1
Nd7?
A terrible blunder. Svidler's desire to transfer the knight to e5 is understandable, but he obviously missed White's simple tactical blow.
16.Nd5!
cxd5
17.exd5
Bg4
18.Qxe7
Bxf3
19.Rxf3
Nf6
20.Be3
Qa5
21.Rxf6!
Black's king is helpless now.
21...gxf6
22.Qxf6
Re8
23.Qg5+
Kf8
24.Bd2
[24.Bd2
The only way to prevent Qf6 followed by Bh6+ consists of 24...Qd8
but then 25.Qh6+
Kg8
26.Bc3
ensures White a decisive advantage.] 1-0