[Event "World-ch25 Petrosian-Spassky +4-3=17"]
[Site "Moscow"]
[Date "1966.04.13"]
[Round "2"]
[White "Petrosian, Tigran V"]
[Black "Spassky, Boris Vasilievich"]
[Result "1/2-1/2"]

1. c4 e6 2. Nc3 d5 3. d4 Be7 4. Nf3 Nf6 5. Bg5 O-O 6. e3 h6 7. Bh4 b6 8. cxd5 Nxd5 9. Bxe7 Qxe7 10. Nxd5 exd5 11. Rc1 Be6 12. Qa4 c5 13. Qa3 Rc8 14. Be2 a5 15. O-O Na6 16. dxc5 bxc5 17. Nd4 Bd7 18. Bxa6 Rxa6 19. Ne2 a4 20. Rfd1 Qd6 21. Rd2 Be6 22. h3 Rc7 23. Nf4 c4 24. Qxd6 Rxd6 25. Ne2 a3 26. bxa3 Bf5 27. Nc3 Rcd7 28. Rd4 Kf8 29. f3 Ke7 30. Rcd1 Be6 31. Rb1 Ra6 32. a4 Kd6 33. Kf2 Kc5 34. Rd2 Ra5 35. Ke2 Bf5 36. e4 dxe4 37. fxe4 Rxd2+ 38. Kxd2 Bd7 39. Rb7 Kc6 40. Rb8 Kc5 41. Rf8 Be6 42. Rb8 Bd7 43. Rb7 Kc6 44. Rb2 Kc5 45. Ke3 Ra7 46. Rd2 Bc6 47. g4 Rb7 48. Rf2 Rd7 49. Rd2 Rb7 50. h4 f6 1/2-1/2