[Event "Havana"]
[Site "Havana CUB"]
[Date "1965.09.01"]
[EventDate "1965.08.25"]
[Round "6"]
[Result "1/2-1/2"]
[White "Jan Hein Donner"]
[Black "Efim Geller"]
[ECO "E60"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "42"]

1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 O-O 5.Nc3 c5 6.Nf3 cxd4 7.Nxd4
Nc6 8.Nc2 d6 9.O-O Be6 10.b3 Rc8 11.Bb2 Qa5 12.Nd5 Nxd5
13.Bxg7 Nc3 14.Bxc3 Qxc3 15.Ne3 Qe5 16.Nd5 Bxd5 17.Bxd5 b5
18.Rc1 Nb8 19.Qd3 e6 20.Bf3 bxc4 21.Rxc4 d5 1/2-1/2