[Event "Alekhine Memorial-02"]
[Site "Moscow"]
[Date "1971.12.09"]
[Round "12"]
[White "Petrosian, Tigran V"]
[Black "Hort, Vlastimil"]
[Result "1/2-1/2"]

1. c4 c5 2. Nf3 Nf6 3. g3 Nc6 4. Bg2 d5 5. cxd5 Nxd5 6. Nc3 e6 7. O-O Be7 8. Nxd5 exd5 9. d4 O-O 10. dxc5 Bxc5 11. Qd3 h6 12. a3 a5 13. Bf4 Re8 1/2-1/2