[Event "World-ch25 Petrosian-Spassky +4-3=17"] [Site "Moscow"] [Date "1966.05.06"] [Round "12"] [White "Petrosian, Tigran V"] [Black "Spassky, Boris Vasilievich"] [Result "1/2-1/2"] [Annotator "ChessBase/Bulletin"] [Variant "Standard"] [ECO "A04"] [Opening "Zukertort Opening: Kingside Fianchetto"] [Source "https://lichess.org/study/0iVkxKw7/ijNflzrF"] [Orientation "black"] 1. Nf3 g6 2. c4 Bg7 3. d4 d6 4. Nc3 Nd7 5. e4 e6 6. Be2 b6 7. O-O Bb7 8. Be3 Ne7 9. Qc2 h6 10. Rad1 O-O 11. d5! { Preventing 11...f5. } 11... e5 12. Qc1 Kh7 13. g3 f5?! { >= } (13... a5!? 14. Nh4 Nc5 { and 15...Bc8 }) 14. exf5 Nxf5 (14... gxf5 15. Nh4! { and 16.f4 }) 15. Bd3 Bc8 16. Kg2 Nf6 17. Ne4 Nh5!? (17... Nxe4 18. Bxe4 Nxe3+ 19. fxe3! Bg4 20. Qc2 Qe8 21. Nh4 $16) (17... Bd7) 18. Bd2 Bd7 19. Kh1 (19. g4 Nh4+! 20. Nxh4 Qxh4 21. gxh5 Qh3+! $17) 19... Ne7 20. Nh4! Bh3 (20... c6 21. f3 cxd5 22. cxd5 Rc8 23. Qb1 $16) 21. Rg1 Bd7 (21... Qd7 22. g4!) 22. Be3 (22. f3!? { /\ 23.Rfd1 }) 22... Qe8 (22... Nf5 23. Nxg6! Kxg6 24. g4) 23. Rde1 Qf7 24. Qc2 Kh8 25. Nd2 Nf5 26. Nxf5! (26. Nxg6+? Qxg6 27. g4 Nhg3+! 28. fxg3 Qxg4 $17) 26... gxf5 27. g4! $40 e4!? (27... f4?! 28. Bg6 Qf6 29. Bxb6 (29. gxh5 fxe3 30. fxe3 e4!) 29... axb6 30. Be4 $16) 28. gxh5 f4!? { [#] } (28... exd3 29. Qxd3 Rae8! 30. Nf3 $16) 29. Rxg7!! $18 Qxg7 30. Rg1 Qe5 (30... Bg4 31. Rxg4 Qxg4 32. Bd4+ Kg8 33. Bxe4 Rf7 34. f3 Qg5 35. Bg6 Re7 36. Ne4) (30... exd3 31. Qxd3 Qxg1+ 32. Kxg1 Rg8+ 33. Kh1! fxe3 34. Qxe3 Rg5 35. Ne4! Re8 36. h4 Rxh5 37. Qd4+ Ree5 38. Nf6! $18) 31. Nf3! { /\32.Bd4 } 31... exd3 (31... exf3 32. Bd2 Bh3 33. Bc3 Bg2+ 34. Rxg2 fxg2+ 35. Kxg2 f3+ 36. Kf1 $18) 32. Nxe5? (32. Qxd3 $18 Bf5 33. Nxe5 Bxd3 34. Bd4 dxe5 (34... Be4+ 35. Nf3+!) 35. Bxe5+ Kh7 36. Rg7+ Kh8 37. Rxc7+ Kg8 38. Rg7+ Kh8 39. Rxa7+ Kg8 40. Rg7+ Kh8 41. Rg3+ Kh7 42. Rxd3 $18) 32... dxc2 33. Bd4! dxe5 34. Bxe5+ Kh7 35. Rg7+ Kh8 36. Rf7+ Kg8 37. Rg7+ Kh8 38. Rg6+ (38. Rxd7+ Kg8 39. Rg7+ Kh8 40. Rxc7+ Kg8 41. Rg7+ Kh8 $10 42. Rg1+ Kh7 43. Rc1 Rae8 44. Bd4 Re2) 38... Kh7 39. Rg7+ { 1/2-1/2 The game is a draw. } 1/2-1/2