[Event "Vidmar Memorial-02"]
[Site "Ljubljana/Portoroz"]
[Date "1973.04.20"]
[Round "14"]
[White "Osterman, Rudolf"]
[Black "Portisch, Lajos"]
[Result "0-1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bc4 e6 7. Bb3 b5 8. O-O Be7 9. f4 O-O 10. e5 dxe5 11. fxe5 Nfd7 12. Nf3 Bb7 13. Qe1 Bxf3 14. Rxf3 Nc6 15. Bf4 Nc5 16. Rf1 Qb6 17. Kh1 a5 18. Qg3 Kh8 19. Be3 a4 20. Bd5 exd5 21. Nxd5 Qb7 22. Rae1 Ne6 23. Qh3 Ncd4 24. Nf6 gxf6 25. Bxd4 Nxd4 26. exf6 Bd6 27. c3 Ne6 0-1