[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.04.22"]
[Round "6"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1/2-1/2"]

1. c4 e6 2. d4 Nf6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. g3 Nc6 7. Bg2 Nxc3 8. bxc3 cxd4 9. cxd4 Bb4+ 10. Bd2 Be7 11. O-O O-O 12. Rb1 Nxd4 13. Nxd4 Qxd4 14. Qc2 Qc5 15. Qxc5 Bxc5 1/2-1/2