[Event "IBM"]
[Site "Amsterdam"]
[Date "1968.??.??"]
[Round "4"]
[White "Donner, Jan Hein"]
[Black "Kavalek, Lubomir"]
[Result "0-1"]
[WhiteElo ""]
[BlackElo ""]
[ECO "E62"]

1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 O-O 5.Nc3 d6 6.Nf3 c6 7.O-O Qa5 8.h3 e5 9.d5 cxd5
10.cxd5 b5 11.Nd2 Bd7 12.a3 Qc7 13.Qb3 Qb6 14.a4 bxa4 15.Qxb6 axb6 16.Nc4 b5
17.Nxd6 b4 18.Na2 Na6 19.Be3 Ne8 20.Ne4 f5 21.Nc5 Nxc5 22.Bxc5 b3 23.Bxf8 Kxf8
24.Nb4 e4 25.Rab1 Rc8 26.f3 Rc4 27.Nc6 e3 28.f4 Bxc6 29.dxc6 Rc2 30.Ra1 Rxe2
31.Rxa4 Rxb2 32.Rc4 e2 33.Rfc1 Rd2 34.Kf2 b2  0-1

