[Event "Interzonal-04"]
[Site "Portoroz"]
[Date "1958.09.04"]
[Round "18"]
[White "Panno, Oscar"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. O-O O-O 5. c4 d6 6. d4 Nc6 7. Nc3 e5 8. d5 Ne7 9. Ne1 c5 10. e4 Nd7 11. Nd3 f5 12. f3 Kh8 13. Bg5 h6 14. Bd2 a6 15. a4 a5 16. Nb5 Nf6 1/2-1/2