[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.16"]
[Round "4"]
[White "Hartoch, Robert G"]
[Black "Timman, Jan H"]
[Result "1-0"]

1. d4 Nf6 2. Nf3 e6 3. g3 b5 4. a4 b4 5. Bg2 Bb7 6. O-O Be7 7. c4 O-O 8. b3 Qc8 9. Bb2 c5 10. e3 d6 11. Nbd2 Ne4 12. Nxe4 Bxe4 13. Ne1 Bxg2 14. Kxg2 Bf6 15. Qd2 Nc6 16. Rd1 Na5 17. Qc2 Qb7+ 18. d5 Bxb2 19. Qxb2 Rae8 20. Kg1 e5 21. e4 f5 22. exf5 Rxf5 23. Rd3 Qf7 24. Qe2 e4 25. Re3 Rf8 26. Qc2 g5 27. Qxe4 Rxf2 28. Nf3 Rxf1+ 29. Kxf1 Qg7 30. Ke2 Kh8 31. Qe6 g4 32. Nd2 Qg6 33. Qxg6 hxg6 34. Re7 a6 35. Re6 Kg7 36. Rxd6 Rh8 37. Rxa6 Rxh2+ 38. Ke3 1-0