[Event "IBM"]
[Site "Amsterdam"]
[Date "1970.07.25"]
[Round "10"]
[White "Ree, Hans"]
[Black "Jongsma, Alexander"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 Nc6 3. Nf3 d6 4. Nc3 e5 5. d5 Ne7 6. e4 h6 7. h3 Ng6 8. Be3 Be7 9. g3 O-O 10. Qc2 Bd7 11. Bg2 Qc8 12. Nd2 c5 13. h4 Ng4 14. Nf1 Nxe3 15. Nxe3 a6 16. Nf5 Re8 17. O-O Qc7 18. Nd1 Bf8 19. Bh3 Nh8 20. Kg2 Qc8 21. Rh1 g6 22. Nfe3 Bg7 23. h5 Rf8 24. Nc3 Bf6 25. hxg6 fxg6 26. Bxd7 Qxd7 27. Rxh6 Bg5 28. Rh2 Bxe3 29. fxe3 Nf7 30. Ne2 Ng5 31. Rah1 Kg7 1/2-1/2