Comments by Sergey Zagrebelny. Round 4

The report of the most brilliant games of the fourth round is proposed to the attention of the readers by GM Sergey Zagrebelny.

 Karjakin,Sergey (2747 Russia 1) - Onischuk,Alexander (2688 USA)

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0–0 Be7 6.Re1 b5 7.Bb3 0–0 8.h3 Bb7 9.d3 d5  10.exd5 Nxd5 11.Nxe5 Nd4. This variation is very similar to the Marshall Attack.

12.Bd2 c5 13.Nc3 Nxb3 14.axb3 Nb4 15.Ne4 f5 16.Ng3 Qd5 17.Nf3 Qd7. A new move.Earlier Black played 17...Bd6 18.c4 Qc6 19.Bxb4 cxb4 20.Qd2, etc., Mekhitarian,K (2511)-Perez Rodriguez,L (2521)/ICC INT 2008. 18.Ne5 Qd5 19.Nf3 Qd7 20.Bxb4 cxb4 21.d4 Rac8 22.Qd3 Bd6 23.Ne5

 23...Qc7. This move is not ideal, although White enjoys a big advantage and excellent attacking chances after 23...Bxe5 24.Rxe5 g6 25.Rae1 Qc6 26.d5 Qxc2 27.Qd4 Qc5 28.Qh4. 24.Nxf5 Bxe5 25.Rxe5 Qxc2 26.Ne7+ Kh8 27.Qg3 Rcd8 28.Rae1 Qd2 29.R1e3

29...Qxb2 30.Qh4 Rd6 If 30...Rxd4??, then 31.Qxh7+! Kxh7 32.Rh5# ends the game on the spot. The most stubborn defense is 30...Qc2!? 31.Rf5! Ra8 32.Qf4 Rdd8 33.Rf7. Black’s position is hopeless. For example, on 33...Qxd4 White wins by 34.Rf8+ Rxf8 35.Qxd4. Black resigns.

Ivanchuk,Vassily (2754 Ukraine) - Beliavsky,Alexander  (2632 Slovenia)

1.c4 c6 2.e4 d5 3.exd5 cxd5 4.d4 Nf6 5.Nc3 Nc6 6.Bg5 dxc4 7.Bxc4

 7...Nxd4?! A highly risky continuation. Normally Black plays 7...e6 8.Nf3 Be7 9.0–0 0–0 or opts for the following forced line: 7...Qxd4 8.Qxd4 Nxd4 9.0–0–0 e5 10.f4 Bg4 11.Nf3 Nxf3 12.gxf3 Bxf3 13.fxe5 Bxh1 14.exf6 etc. 8.Nf3 Nxf3+ 9.Qxf3. White enjoys big lead in development for a pawn.9...Qc7 10.Bb5+ Bd7 11.0–0 Bc6. A new move, which does not solve any problems. Earlier 11...Bxb5 was played, and White got a decisive advantage by 12.Nxb5 Qb6 13.a4 e6 14.Be3 Qd8 15.Qxb7. 12.Bxf6 gxf6 13.Rad1 e6

14.Nd5! 0–0–0 On 14...exd5 White wins by 15.Rfe1+ Be7 16.Qxf6 Rg8 17.Bxc6+ bxc6 18.Rxe7+! Qxe7 19.Qxc6+ Kf8 20.Qxa8+ Kg7 21.Qxd5. 15.Bxc6 exd5 16.Bxd5 Kb8 

17.Rc1 Qd7 18.Rcd1 Be7 19.g3 Qc7 20.Rc1 Qd7 21.Rfd1 Rc8?! Allowing a very nice combination.

22.Bxb7! Rxc1 23.Rxc1 Qxb7 24.Qf4+ Ka8 25.Rc7. Black resigns.

Topalov, Veselin (Bulgaria 2803) – Lodhi, Mahmood (2391 Pakistan)

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Nbd7 8.0–0 Bb4 9.Nh4 Bg6 10.g3 a5 11.Qe2 0–0  12.Nxg6 hxg6 13.Rd1 Qe7 14.e4 e5

15.d5 Ne8? A rather artificial maneuver. The usual15...Rad8 should be preferred. 16.dxc6 bxc6 17.Qg4! White immediately utilizes the opponent’s mistake.   17...Nd6 18.Ba2 Nf6

19.Qxg6 Kh8  20.Qg5 Bxc3 + 21.bxc3 Ndxe4 22.Qh4+ Kg8 23.Bb1! Nxc3

The game enters the crucial stage, and Topalov conducts it excellently.24.Bh7+! Kh8 25.Ba3 Qe8 Or 25...c5 26.Rd7 Qe8 27.Bf5+ Kg8 28.Bxc5+-. 26.Bf5+ Kg8 27.Rd6!+- Ncd5 28.Rd1 g6

29.Rxf6! A very spectacular final blow! 29...Nxf6 30.Qxf6 Rd8 On 30...gxf5 White mates by 31.Rd6 Rd8 32.Qg5+ Kh8 33.Rh6#. 31.Rc1 gxf5 32.Be7 Rd1+ Is this a joke? More understandable is 32...Rd7 33.Qg5+ Kh7 34.Bf6, and mate is inevitable. 33.Rxd1. Black resigns.