[Event "IBM"]
[Site "Amsterdam"]
[Date "1972.??.??"]
[Round "?"]
[White "Hartoch, Robert G"]
[Black "Donner, Jan Hein"]
[Result "0-1"]

1. c4 Nf6 2. Nc3 e6 3. e4 c5 4. e5 Ng8 5. Nf3 Nc6 6. d4 cxd4 7. Nxd4 Nxe5 8. Bf4 d6 9. Qd2 Bd7 10. O-O-O Rc8 11. Kb1 a6 12. Nb3 Nxc4 13. Bxc4 Rxc4 14. Bxd6 Bxd6 15. Qxd6 Qc7 16. Na5 Qxd6 17. Rxd6 Rc7 18. Rb6 Bc8 19. Ne4 Nf6 20. Nd6+ Ke7 21. Ndxb7 Nd5 22. Rb3 e5 23. a3 Bf5+ 24. Ka1 Rhc8 25. Rg3 Nf4 26. Rxg7 Be6 27. b4 Rc1+ 0-1