[Event "Leningrad"] [Site "?"] [Round "0"] [White "Botvinnik"] [Black "Kan"] [Result "1-0"] [ECO "E21"] [Opening "Nimzo-Indian: Three Knights"] {The bad bishop outside the pawn chain and in possession of a support-point} 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 c5 5. a3 Bxc3+ 6. bxc3 Qa5 7. Bd2 Ne4 8. Qc2 Nxd2 9. Nxd2 d6 10. e3 e5 11. dxe5 dxe5 12. Bd3 h6 13. O-O O-O 14. f4 Nd7 15. f5 Nf6 16. Ne4 Qd8 17. Nxf6+ Qxf6 18. Be4 Rb8 19. Rad1 b6 20. h3 Ba6 21. Bd5 b5 22. cxb5 Rxb5 23. c4 Rb6 24. Rb1 Rd8 25. Rxb6 axb6 26. e4 Bc8 {The White bishop is very bad, since three of his pawns are fixed on his own colour. But thanks to the fact that the Bishop is outside the pawn chain and posted on a square from which it rakes both wings of the enemy position, it is precisely this "bad" bishop which is White's winnning trump!} 27. Qa4 Bd7 28. Qa7 {Under the c ircumstances White has no thought of exchanging his bad Bishop for Black's good one.} 28... Be8 (28... Bc6 29. Qxb6) 29. Rb1 Rd6 30. a4 Kh7 (30... Qd8 31. a5 bxa5 32. Rb8 $18) 31. a5 bxa5 32. Qxa5 (32. Qxc5 a4 $132) 32... Ra6 33. Qxc5 Ra2 34. Qe3 $1 Qa6 35. Rb8 Qa4 36. Kh2 Ra3 (36... Qc2 37. Qg3 Ra1 (37... Ba4 38. Bxf7 $18) 38. Rxe8 Qc1 39. Qg6+ fxg6 40. Bg8+ Kh8 41. Bf7+ Kh7 42. Bxg6# { Botvinnik}) 37. Qc5 Ra2 38. Ra8 Qxa8 (38... Qc2 39. Rxa2 Qxa2 40. Qe7 Qd2 41. Qxe5 $18 (41. Qxe8 Qf4+ 42. Kg1 Qe3+ 43. Kf1 Qc1+ 44. Kf2 Qd2+ 45. Kf3 Qd3+ 46. Kg4 Qe2+ $11)) 39. Bxa8 Rxa8 40. Qxe5 Bc6 41. Qc7 1-0