[Event "IBM"]
[Site "Amsterdam"]
[Date "1968.??.??"]
[Round "4"]
[White "Ivkov, Borislav"]
[Black "Langeweg, Kick"]
[Result "1-0"]
[WhiteElo ""]
[BlackElo ""]
[ECO "E16"]

1.c4 Nf6 2.d4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Bd2 Be7 7.Nc3 d5 8.O-O O-O
9.Ne5 c6 10.Qa4 Nbd7 11.Nxc6 Bxc6 12.Qxc6 Rc8 13.Qb5 Rxc4 14.e3 Qc8 15.Rfc1 a6
16.Qb3 Rc7 17.e4 Nxe4 18.Nxe4 dxe4 19.Bxe4 b5 20.Rxc7 Qxc7 21.Rc1 Qd8 22.Be3 Nf6
23.Bb7 Qb6 24.Bf3 Qa5 25.Bf4 h6 26.h4 b4 27.Rc7 Bd8 28.Rb7 Bb6 29.Bd6 Rc8
30.Be5 Rd8 31.Qc4 b3 32.axb3 Qe1+ 33.Kg2 Ne4 34.Qf1 Qxf1+ 35.Kxf1 Nd2+ 36.Ke2 Nxf3
37.Rxb6 Nxd4+ 38.Bxd4 Rxd4 39.Rxa6 Rb4 40.Ra3 Kf8 41.Kd3 Rb7 42.b4 Rxb4 43.Ra8+ Ke7
44.Ra7+ Kf6 45.Kc3 Rb8 46.b4 e5 47.Kc4 Rc8+ 48.Kb3 Rc1 49.Ra2 Ke6 50.b5 Kd6
51.Kb4 Rb1+ 52.Ka5 Kc7 53.Ka6 f6 54.h5 Rb3 55.Rc2+ Kb8 56.Kb6 Rd3 57.Rc7 Rd6+
58.Rc6 Rd2 59.f4 Rd3 60.fxe5 fxe5 61.Re6 Kc8 62.g4 Rd4 63.g5 hxg5 64.Rxe5 g6
65.Kc5  1-0

