[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.08.15"]
[Round "16"]
[White "Biyiasas, Peter"]
[Black "Hug, Werner"]
[Result "1-0"]

1. Nf3 c5 2. e4 e6 3. Nc3 Nc6 4. Bb5 Nge7 5. O-O a6 6. Bxc6 Nxc6 7. d4 cxd4 8. Nxd4 Be7 9. Nxc6 dxc6 10. e5 O-O 11. Qe2 Qc7 12. Bf4 c5 13. Ne4 Qc6 14. Rad1 b6 15. Bg5 Bxg5 16. Rd6 Qc7 17. Nxg5 Bb7 18. Qd3 g6 19. Rd1 Bd5 20. c4 Bc6 21. Qh3 h5 22. Nxe6 1-0