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Tigran V Petrosian vs Fernando Visier Segovia
Nice Olympiad Final-A (1974), Nice FRA, rd 13, Jun-27
King's Indian Defense: Saemisch Variation (E80)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
Jul-27-04  patzer2: Petrosian's 25. Rxg6+! is given as the solution to number 1743 in Chess Informant's 1980 Encyclopedia of Middle Games/Combinations. The combination is categorized under the theme "Demolition of Pawn Structure" via "Sacrifice at g6 (g3)."

After 26...Ng7 27. Rh1, Black can try to improve and hold the position with 27...Qe7, but White with careful play still dominates the position with variations such as 28. Rh6 b3 29. Nh5 bxa2 30. e6 Qh4+ 31. Ke2 Re8 32. Nf6 Qxf6 33. Qh7+ Kf8 34. Rxf6+ Ke7 35. Qxg7+ Kd8 36. Qg5 a1Q 37. Rf8+ Kc8 38. Rxe8+ Kb7 39. e7 Qxa4 40. Rd8 Qc4+ 41. Kf2 Qxd4+ 42. Kg3 Kb6 43. Ra8 Kb5 44. e8Q Rg7 45. Qe2+ Ka4 46. Qc2+ Kb5 47. Qxg7 Qxg7+ 48. Kf2 Qd4+ 49. Ke2 Nc5 50. Qc3 Qxc3 51. bxc3 Ne6 52. g4 .

If 27...Qe8, then 28. Qh7+ Kf7 29. Nh5
is winning for White.

Mar-24-07  ALEXIN: Game analysed in the Demolition Chapter of "L'école des échecs: les méthodes d'attaque sur le Roi" of A. Kotov.
May-21-09  arsen387: Great attacking game by Petrosian. The R sac on g6 is very well planned, blacks can't escape from the resulting mating net. Petrosian is famous for his defensive technique, but when granted the opportunity to attack he did it with a precision that many attacking players would envy. This game was among the best games played at 1974 Nice Olimpiad.
Oct-18-21
Premium Chessgames Member
  kingscrusher: At move 18 Black had to play c5. The White king is quite precarious in the center and the move c5 also vacates c6 for a knight which means sometimes Nxd4 defending against ideas of Rh3 and Nf5 in some variations.

Tigran Vartanovich Petrosian - Fernando Visier Segovia 1-0 13.0, Olympiad Final-A 1974


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Analysis by Stockfish 14:

1. ⩱ (-0.37): 18...c5 19.h5 Qe7 20.Kd1 Nc6 21.hxg6 fxg6 22.Nf5 gxf5 23.Qxc6 cxd4 24.Qxd5+ Kh8 25.e6 Qxe6 26.Qxe6 Rxe6 27.Rc1 Rg6 28.Rc7 Nf6 29.Rh2 h6 30.Nc5 Nd5 31.Rd7 Ne3+ 32.Ke2 Rxg2+ 33.Rxg2 Nxg2

In the game with Na6 White's king was far less exploitable and also White's attack potential far more with crude stuff like h4 and Rh3 for Nf5.

However, Petrosian's later sacrifice on g6 is brilliant stuff. Petrosian earlier in the game could have played 18.Nxe2 which was less risky and then maybe try and castle Queenside if c5 is played.

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