[Event "IBM"]
[Site "Amsterdam"]
[Date "1962.08.14"]
[Round "1"]
[White "Dunkelblum, Arthur"]
[Black "Tan, Hiong Liong"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 d5 5. cxd5 exd5 6. Bg5 c5 7. dxc5 h6 8. Bxf6 Qxf6 9. e3 Be6 10. Bb5+ Nc6 11. Ne2 O-O 12. O-O Rac8 13. Na4 Ne5 14. a3 Ba5 15. b4 Bc7 16. f4 Ng4 17. Qd2 a6 18. Bd3 Rfe8 19. Nac3 Rcd8 20. Nd4 Bc8 21. Rae1 Kf8 22. Bc2 Qh4 23. h3 Nf6 24. Qf2 Qxf2+ 25. Kxf2 h5 26. Rd1 g6 27. Ba4 Re7 28. Rfe1 Kg7 29. Bb3 Be6 30. Kf3 Bc8 31. Re2 Kh6 32. Kf2 Be6 33. Red2 Rde8 34. Ba4 Rg8 35. Nf3 Ne4+ 36. Nxe4 dxe4 37. Ng5 Bf5 38. Bb3 Rf8 39. h4 f6 40. Nh3 Bg4 41. Rc1 Bxh3 42. gxh3 Bxf4 43. Rd5 Be5 44. Rcd1 1/2-1/2