[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "10"]
[White "Barendregt, Johan"]
[Black "Donner, Jan Hein"]
[Result "1/2-1/2"]

1. e4 d6 2. f4 g6 3. Nf3 Bg7 4. g3 c5 5. Bg2 Nc6 6. O-O Rb8 7. a4 a6 8. Nc3 b5 9. axb5 axb5 10. d3 e6 11. g4 Nge7 12. Ne2 b4 13. Ng3 Nd4 14. Nxd4 Bxd4+ 15. Kh1 h5 16. g5 Bg7 17. h4 f5 18. exf5 exf5 19. Re1 Bb7 20. Qe2 Bxg2+ 21. Kxg2 Qd7 22. Ra6 Kf7 23. Qf3 Rhd8 24. Nf1 Qb7 25. Qxb7 Rxb7 26. Nd2 Nd5 27. Nc4 Rbd7 28. b3 Nc7 29. Rb6 1/2-1/2