[Event "IBM"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "6"]
[White "Trifunovic, Petar"]
[Black "Donner, Jan Hein"]
[Result "1/2-1/2"]

1. Nf3 d5 2. d4 Nf6 3. c4 e6 4. Nc3 c5 5. cxd5 Nxd5 6. g3 b6 7. Nxd5 Qxd5 8. Bg2 Bb7 9. O-O Be7 10. Be3 O-O 11. dxc5 Bxc5 12. Qxd5 Bxd5 13. Bxc5 bxc5 14. Ne5 f6 15. Nd3 1/2-1/2