[Event "IBM"]
[Site "Amsterdam"]
[Date "1973.??.??"]
[Round "11"]
[White "Enklaar, Bert F"]
[Black "Ree, Hans"]
[Result "1/2-1/2"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 cxd4 13. cxd4 Nc6 14. a3 Bd7 15. d5 Na5 16. Nf1 Nh5 17. Ne3 g6 18. Bd2 Nc4 19. Nxc4 Qxc4 20. Rc1 Qc7 21. g4 Ng7 22. Bd3 Qb7 23. Kh2 Rfc8 24. Qe2 Rxc1 25. Rxc1 Rc8 26. Rg1 Bd8 27. h4 Be7 28. h5 Qb6 29. Rg2 Rf8 30. Kg1 Qd8 31. Qe3 Qc8 32. hxg6 fxg6 33. Nh2 Qc5 34. Qe2 Bd8 35. Be3 Qc8 36. Nf1 Qb8 37. Bh6 Bb6 38. Ne3 Rf7 39. Qd2 Qd8 40. Be2 Kh8 41. Nf1 Bd4 1/2-1/2