[Event "Interzonal-11b"]
[Site "Rio de Janeiro"]
[Date "1979.09.27"]
[Round "4"]
[White "Timman, Jan H"]
[Black "Petrosian, Tigran V"]
[Result "1/2-1/2"]
[WhiteElo "2625"]
[BlackElo "2610"]

1. c4 g6 2. d4 Bg7 3. Nc3 d6 4. e4 Nf6 5. f3 c6 6. Be3 O-O 7. Bd3 a6 8. Nge2 b5 9. Qd2 Nbd7 10. b3 e5 11. d5 cxd5 12. cxd5 Nc5 13. Bc2 Nh5 14. O-O f5 15. b4 Nd7 16. exf5 gxf5 17. Rac1 Nb6 18. Bb3 Nf6 19. Kh1 f4 20. Bxb6 Qxb6 21. Bc2 Qe3 22. Qxe3 fxe3 1/2-1/2