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Leko, Peter - Ivanchuk, Vassily 2009.??.??

Mukachevo (m/6-rapid) 105/24

1.e4 d5 2.exd5 Qxd5 3.Nf3 Bg4 4.Be2 Nc6 5.d4 O-O-O 6.Be3 e5 7.c4 Qa5+ 8.Bd2 Bb4 9.d5 Bxf3 (9... e4?! 10.Ng5 Bxe2 11.Qxe2 Nd4 12.Qd1 (12.Qxe4 Bxd2+ 13.Nxd2 Nb3 14.Rd1 Nxd2 15.Rxd2 Nf6 16.Qf5+ Kb8 White has sufficient compensation for material deficit) 12... Nf5 13.Nc3 Nf6 14.O-O (14.Nxf7 e3 15.fxe3 Nxe3 16.Bxe3 Bxc3+ 17.bxc3 Qxc3+ 18.Kf1 Qxe3 White has the attack) 14... Rhe8 15.a3 White has a moderate advantage)

10.Bxf3 Nd4 11.Nc3 (11.O-O Nxf3+ 12.gxf3 Nf6 Black has a slight advantage)

11... Qa6! (11... Qc5 12.Be2 (12.b3 f5!) 12... c6 13.O-O Nf6 (13... Bxc3 14.bxc3 Nxe2+ 15.Qxe2 cxd5 16.Qg4+ White has a moderate advantage) 14.Bg5 Bxc3 (14... Qa5 - 86/49) 15.bxc3 Ne6 16.Be3 Qa5 17.Qc2 cxd5 18.Rad1 dxc4 19.Bxc4 White has sufficient compensation for material deficit)

12.b3 (12.Be2!? Velickovic,Sasa)

12... Qa5 (12... g5) (12... Nxf3+) (12... Qg6 13.O-O Nf6)

13.Rc1 f5 14.O-O Nf6 (14... Kb8 15.a3 Be7 (15... Qxa3 16.Nb5 Nxb5 17.Ra1 Qxa1 18.Qxa1 Bxd2 19.cxb5 e4 20.Qxg7 Nh6 21.Bh5 White has a moderate advantage) 16.Ra1 Nf6 17.Re1 White has moderate counterplay)

15.g3? (15.a3! Qxa3 ( a) 15... Bxa3 16.Ra1 Qc5 17.Be3 a6 18.Na4 (18.Bxd4 Qxd4 19.Qc2 Bd6 20.Qxf5+ Kb8 21.Qc2 White has a slight advantage Velickovic,Sasa) 18... Qb4 19.Bxd4 exd4 20.Qxd4 White has a moderate advantage) 16.Nb5 Nxb5 17.Ra1 Qxa1 ( a) 17... Qb2 18.Bxb4 e4 19.Bh5 (19.Be2 Nd4) 19... g6 20.cxb5 Rxd5 21.Qe1 White has a moderate advantage) 18.Qxa1 Bxd2 19.cxb5 e4 20.Rd1 Bf4 21.Be2 Kb8 22.g3 Bd6 White has sufficient compensation for material deficit)

15... Kb8 16.Bg2 (16.a3 Qxa3 17.Nb5 Nxb5 18.Ra1 (18.cxb5 Bxd2 19.Qxd2 e4 Black has a decisive advantage) 18... Qxa1 19.Qxa1 Bxd2 20.cxb5 e4 21.Be2 Rxd5 Black has a moderate advantage)

16... Rhe8 17.Re1 h6 18.Re3 a6 19.h3 Nd7 (19... g5 20.Rd3 Nd7 21.Na4 f4 22.Qe1 Bxd2 23.Qxd2 Qxd2 24.Rxd2 f3 25.Bf1 Black has a slight advantage)

20.Be1 (20.Kh2 g5 21.Nb1 f4 22.Bxb4 Qxb4 23.Re1 f3 24.Bf1 h5 Black has a moderate advantage)

20... Nc5 (20... g5! 21.Na4 f4 White has the initiative)

21.Kh1 (21.f4 exf4 22.Rxe8 Rxe8 23.Qxd4 Nxb3 Black has a decisive advantage)

21... g5 22.f4 exf4 23.Rxe8 Rxe8 24.Qxd4 Rxe1+ 25.Rxe1 Bxc3 26.Re8+ Ka7 27.Qf2 (27.Qd1 Qxa2 (27... fxg3? 28.d6! f4 29.b4 Bxb4 30.d7 Nxd7 31.Qxd7 Qa3 32.Ra8+! Kb6 33.Qd4+ Bc5 34.Qd1 White has a decisive advantage) 28.gxf4 gxf4 29.Re7 Qb2 30.d6 cxd6 31.Qxd6 Qa1+ 32.Kh2 Bd4 33.Qxc5+ Bxc5 34.Rxb7+ Ka8 35.Rb6+ Ka7 36.Rb7+ equal chances, quiet position)

27... fxg3 28.Qxg3 Bd4 (28... f4 29.Qf2 Bd2 30.a3! Be3 31.b4 Qxa3 32.Qe1 Nd3 33.Rxe3 fxe3 34.Qxe3+ Kb8 35.Bf1 White has a moderate advantage)

29.d6! (29.Re2 Qa3 Black has a slight advantage)

29... cxd6 30.Qxd6 Qc3 31.Kh2 Qa1 32.Qb8+ Kb6 33.Qd8+ Ka7 34.Qb8+ Kb6 35.Qd8+ Ka7 1/2-1/2