Petrosian, Tigran V VS Portisch, Lajos 1976.10.19

[Event "Interzonal-10a playoff place 2+3"]
[Site "Varese"]
[Date "1976.10.19"]
[Round "9"]
[White "Petrosian, Tigran V"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]
[WhiteElo "2635"]
[BlackElo "2625"]

1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Ba6 5. b3 Bb4+ 6. Bd2 Be7 7. Bg2 d5 8. cxd5 exd5 9. O-O O-O 10. Nc3 Bb7 11. Rc1 Nbd7 1/2-1/2