[Event "IBM"]
[Site "Amsterdam"]
[Date "1974.??.??"]
[Round "5"]
[White "Ivkov, Borislav"]
[Black "Sosonko, Gennadi"]
[Result "1-0"]
[WhiteElo "2530"]
[BlackElo "2450"]
[ECO "A09"]

1.Nf3 d5 2.c4 d4 3.g3 Nc6 4.Bg2 e5 5.d3 Nf6 6.O-O Nd7 7.Na3 Be7 8.Nc2 O-O
9.e3 Bf6 10.exd4 Nxd4 11.Ncxd4 exd4 12.b4 Re8 13.Re1 a5 14.Rxe8+ Qxe8 15.b5 Nc5
16.Ba3 Ne6 17.Qe1 Qd8 18.Qe4 Rb8 19.Qd5 Bd7 20.Ne5 Be8 21.Re1 Be7 22.Qxd8 Bxd8
23.Bd5 Bf6 24.Nxf7 Bxf7 25.Bxe6 Bxe6 26.Rxe6 c6 27.Bd6 Rc8 28.b6 Kf7 29.Re4 c5
30.Bc7 a4 31.f4 a3 32.Re1 Ra8 33.Rb1 Ke6 34.Kf2 Kd7 35.Kf3 Kc6 36.Rb3 h5
37.Rb1 Be7 38.Rb3 Bf6 39.Rb1 Bd8 40.Bxd8 Rxd8 41.Rb3 Re8 42.f5 Re3+ 43.Kf4 Re2
44.Rxa3 Rxh2 45.Ra8 Rf2+ 46.Ke4 Re2+ 47.Kf4 Rf2+ 48.Ke4 Re2+ 49.Kf3 Re3+
50.Kf4 Rxd3 51.Rg8 Rd1 52.Rxg7 Rf1+ 53.Ke4 Re1+ 54.Kf3 Rf1+ 55.Ke2 Rxf5 56.Rg6+ Kd7
57.a4 Re5+ 58.Kd2 Re7 59.a5 Rh7 60.Rg8 Kc6 61.Rg6+ Kd7 62.Kd3 Ke7 63.Rc6  1-0

