[Event "Interzonal-02"]
[Site "Saltsjobaden"]
[Date "1952.09.19"]
[Round "4"]
[White "Unzicker, Wolfgang"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]

1. d4 Nf6 2. Nf3 e6 3. c4 Bb4+ 4. Bd2 Qe7 5. g3 Nc6 6. Bg2 Bxd2+ 7. Nbxd2 d6 8. O-O O-O 9. e4 e5 10. d5 Nb8 11. b4 Bg4 12. Qc2 Bxf3 13. Nxf3 a5 14. a3 Na6 15. Rab1 axb4 16. axb4 c5 17. dxc6 bxc6 18. b5 Nc5 19. Nd2 1/2-1/2