(1) Maryasin,B (2323) - Gunnarsson,Gun (2209) [B93]
European Senior Team Thessaloniki GRE (1), 03.05.2011 [Mueller,Karsten]

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.f4 Nc6 7.Be3 Qc7 8.Be2 e5 9.Nb3 Be7 10.0-0 0-0 11.a4 exf4 12.Bxf4 Be6 13.Nd5 Bxd5 14.exd5 Ne5 15.Kh1 Nc4 16.Qd4 Rac8 17.Rae1 Rfe8 18.Bd3 b5 19.axb5 axb5 20.Nd2 Qc5 21.Qxc5 Rxc5 22.Ne4 Nxe4 23.Rxe4 f5 24.Re2 Rxd5 25.Rfe1 Kf7 26.b3 Nb2 27.Bxb5 Rxb5 28.Bxd6 Rb7 29.g3 Rd7 30.Bxe7 Rexe7 31.Rxe7+ Rxe7 32.Rb1 Re2 33.Rxb2 Ke7 34.b4 Kd7 35.b5 Kc7 36.b6+ Kb7 37.h4 g6 38.Kg1 h6 39.h5 g5 40.Rb5 Rxc2 41.Rxf5 Kxb6 42.Rf6+ Rc6 43.Rg6 Kc7 44.Kf2 Kd7 45.Kf3 To exchange or not that's the question Before trading down into a pawn ending, you should calculate it to the end:

45...Rxg6?
Now White's king will invade. Black had two ways to draw: [45...Re6?! is playable, but very complicated: 46.Kg4 Ke7 47.Kf5 Re3 48.Rxh6 (48.g4 Rf3+ 49.Ke5 Rf4 50.Rxh6 Rxg4 51.Rh7+ Kf8 52.Kf6 Rf4+ 53.Kg6 White uses the g-pawn as an umbrella, but Black can defend passivly: 53...Kg8 54.Ra7 Rf8= ) 48...Rxg3 49.Kg6 (49.Rh7+ forces 49...Kf8! 50.Kg6 Rf3! but this holds, e.g. 51.Rh8+ Ke7 52.h6 Rf6+ 53.Kxg5 and now best is 53...Rf8 54.Rh7+ Rf7 55.Rg7 Rxg7+ 56.hxg7 Kf7 57.Kh6 Kg8= ) 49...g4 (49...Rf3 50.Rh7+ Kf8= ) 50.Rh7+ Ke6! (50...Kf8? 51.h6 Kg8 52.Ra7+- ) 51.h6 Rf3! 52.Ra7 g3 53.Ra2 Rf6+ 54.Kg7 Rf7+ 55.Kg8 Rf2 56.Ra6+ Ke5 57.Rg6 Kf4 58.h7 Rh2= ; 45...Rc4!? cuts White's king off and is the easiest defensive method: 46.Rxh6 g4+ 47.Ke3 Ke7 48.Rg6 Kf7= ]

46.hxg6 Ke7
[46...h5 47.g7+- ]

47.Kg4 Kf6 48.Kh5
[48.Kh5 Kg7 49.g4 zugzwang 49...Kg8 50.Kxh6 Kh8 51.Kxg5 Kg7 52.Kh5 Kg8 53.Kh6 Kh8 54.g7+ Kg8 55.g5 Kf7 56.Kh7+- ] 1-0