[Event "IBM"]
[Site "Amsterdam"]
[Date "1967.??.??"]
[Round "9"]
[White "Donner, Jan Hein"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 b6 6. Nf3 Bb7 7. Bd2 cxd4 8. exd4 O-O 9. O-O d5 10. cxd5 Bxc3 11. bxc3 Qxd5 12. Re1 Nbd7 13. h3 e5 14. c4 Qd6 15. Nxe5 Nxe5 16. dxe5 Qxd3 17. exf6 Qg6 18. Qg4 Qxf6 19. Rac1 1/2-1/2