[Event "Soviet Championship"] [Site "?"] [Round "0"] [White "Averbakh"] [Black "Petrosian"] [Result "0-1"] [ECO "B90"] [Opening "Sicilian: Najdorf"] 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 {This is a v ariation of the Sicilian Defense where Black allows a weakness at d5, for which there will be some compensation later.} 7. Nb3 Be7 8. O-O O-O 9. Bg5 Be6 10. Bxf6 Bxf6 11. Nd5 {White has a strong outpost on d5, but it can be eliminated at any time by capturing on d5.} 11... Nd7 12. Qd3 Rc8 13. c3 Bg5 14. Rad1 Kh8 15. Bf3 g6 16. Ne3 Rc6 17. Rfe1 Nf6 {Black has a backward d-pawn, but it is well protected by the rook. Black stands better with his more active pieces and pending minority attack on the queenside.} 18. Qe2 b5 {The idea is that the control of the open file allows the b-pawn to advance and disrupt the White queenside.} 19. Ra1 { 19.Nd5 Bxd5 20.exd5 Rc4 when Black stands better on both wings.} 19... Qb6 20. Nd2 a5 21. Ndf1 {Black starts the minority attack rolling.} 21... Rfc8 22. a3 b4 {The key thrust!} 23. cxb4 axb4 24. a4 { White has a passed pawn but it is useless.} 24... Qa7 25. Red1 Ra6 26. Rd3 { 26.Nd5 Bxd5 27.exd5 Rxa4 28.Rxa4 Qxa4 29.Bg4 Nxg4 30.Qxg4 Rc5 31.Qxg5 Qxd1} 26... b3 27. a5 Rcc6 28. Qd1 Qc7 29. Nd5 Bxd5 30. exd5 Rc5 31. Rxb3 Raxa5 32. Rxa5 Rxa5 {Black's minority attack has left White with 3 pawn islands to Black's one. While, White has two isolated pawns that can be attacked, Black's queen pawn is safely tucked away.} 33. Rc3 Qb6 34. Rb3 Qa7 35. Rb4 Kg7 36. h4 Bh6 37. b3 {37.g3 Not giving up the seventh rank offered more resistance.} 37... Ra2 38. Qe1 Qa5 39. Qb1 Ra1 40. Rb5 Qc3 { White resigned because his queen has been trapped.} 0-1