[Event "Interzonal-04"]
[Site "Portoroz"]
[Date "1958.08.10"]
[Round "4"]
[White "Filip, Miroslav"]
[Black "Olafsson, Fridrik"]
[Result "1/2-1/2"]

1. c4 Nf6 2. Nf3 g6 3. Nc3 Bg7 4. e4 d6 5. d4 O-O 6. Be2 Nbd7 7. O-O e5 8. Re1 c6 9. Bf1 Qe7 10. Rb1 a6 11. d5 cxd5 12. cxd5 Ne8 13. Nd2 f5 14. exf5 gxf5 15. f4 Nef6 16. Nf3 Qd8 17. h3 Ne4 18. Nxe4 fxe4 19. Ng5 Nc5 20. fxe5 Bxe5 21. Qh5 Bf5 22. Be3 Bg6 23. Qg4 Bf5 1/2-1/2