[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "4"]
[White "Enevoldsen, Jens"]
[Black "Van den Berg, Carel"]
[Result "1-0"]

1. e4 c5 2. Nf3 Nc6 3. c3 Nf6 4. d3 g6 5. g3 Bg7 6. Bg2 O-O 7. O-O b6 8. Ne1 e6 9. f4 d5 10. e5 Nd7 11. Nf3 a5 12. a4 f6 13. d4 cxd4 14. cxd4 fxe5 15. fxe5 Ba6 16. Rf2 Nb4 17. Be3 b5 18. axb5 Bxb5 19. Nc3 Bd3 20. Ne1 Rxf2 21. Bxf2 Ba6 22. Bh3 Nf8 23. Be3 Nc6 24. Na4 Qb8 25. Qc2 Qb5 26. Nc5 Bc8 27. Bf1 Qb8 28. Ned3 Nb4 29. Nxb4 Qxb4 30. Ra3 Qb6 31. Rb3 Qc7 32. Rc3 Qe7 33. Nd3 Ba6 34. Rc7 Qd8 35. Qc6 Kh8 36. Nc5 Bxf1 37. Kxf1 a4 38. Bc1 Rb8 39. Kg2 Rb4 40. Rc8 Qe7 1-0