[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "6"]
[White "Darga, Klaus"]
[Black "Donner, Jan Hein"]
[Result "1/2-1/2"]

1. e4 e5 2. Nf3 Nf6 3. d4 exd4 4. e5 Ne4 5. Qxd4 d5 6. exd6 Nxd6 7. Bd3 Nc6 8. Qf4 g6 9. O-O Bg7 10. Nc3 O-O 11. Be3 Be6 12. a4 a5 13. Bc5 Qf6 14. Qxf6 Bxf6 15. Nb5 Rfc8 16. Bxd6 cxd6 17. Nxd6 Rc7 18. Be4 Rd8 19. Nb5 Rcd7 20. c3 Ne5 21. Nfd4 Bc4 22. Rfe1 Nd3 23. Bxd3 Bxd3 1/2-1/2