[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "3"]
[White "Barendregt, Johan"]
[Black "Darga, Klaus"]
[Result "0-1"]

1. e4 c5 2. Nf3 e6 3. b4 cxb4 4. d4 Nf6 5. Bd3 d5 6. e5 Ne4 7. Qe2 Bd7 8. O-O Bc6 9. a3 Na6 10. Rd1 Be7 11. Bxa6 bxa6 12. axb4 Bb5 13. Qe1 Rc8 14. c3 O-O 15. Bb2 f6 16. Nfd2 Nxd2 17. Nxd2 fxe5 18. Qxe5 Rf6 19. Qe3 Bd6 20. g3 Qe8 21. f4 Qg6 22. Kh1 Bd3 23. Nf3 Be4 24. Rd2 Qg4 25. Rf2 Bxf4 26. gxf4 Rxf4 0-1