[Event "Interzonal-11b"]
[Site "Rio de Janeiro"]
[Date "1979.09.25"]
[Round "3"]
[White "Petrosian, Tigran V"]
[Black "Vaganian, Rafael A"]
[Result "1/2-1/2"]
[WhiteElo "2610"]
[BlackElo "2570"]
1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. Bg5 h6 6. Bh4 O-O 7. e3 b6 8. cxd5 Nxd5 9. Bxe7 Qxe7 10. Nxd5 exd5 11. Qd2 a5 12. Rc1 Be6 1/2-1/2