[Event "FIDE World Cup 2011"]
[Site "Khanty-Mansiysk RUS"]
[Date "2011.09.08"]
[Round "4.4"]
[White "Potkin, Vladimir"]
[Black "Grischuk, Alexander"]
[Result "0-1"]
[ECO "E73"]
[WhiteElo "2682"]
[BlackElo "2746"]
[Annotator "Müller,Karsten"]
[PlyCount "114"]
[EventDate "2011.08.28"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Bg5 Na6 7. f4 c6 8. Qd2 d5
9. Bxf6 exf6 10. exd5 cxd5 11. Nxd5 Re8 12. Nf3 Be6 13. Ne3 Qe7 14. O-O Bd7 15.
Kf2 Bc6 16. Rae1 Rad8 17. d5 Nc5 18. Bd3 Qc7 19. g3 a5 20. Kg2 Bd7 21. Nd1 f5
22. b3 b5 23. cxb5 Ne4 24. Bxe4 fxe4 25. Nd4 Qc5 26. Nc6 Bxc6 27. bxc6 Rxd5 28.
Qf2 Qxc6 29. Ne3 Bd4 30. Qc2 Qxc2+ 31. Nxc2 Bc5 32. Re2 Red8 33. Rc1 f5 34. Kf1
Kf7 35. Ne3 Bxe3 36. Rxe3 Rd1+ 37. Rxd1 Rxd1+ 38. Re1 Rxe1+ 39. Kxe1 Ke6 40.
Kd2 Kd5 41. Kc3 Kc5 42. a3 Kd5 43. b4 axb4+ 44. axb4 h6 45. h3 h5 46. h4 Kc6
47. Kc4 Kb6 $2 ({Golubev showed the way in Chess Today 3957:} 47... Kc7 $1 48.
Kc3 ({I add} 48. b5 Kb6 49. Kb4 e3 50. Kc3 Kxb5 51. Kd3 Kb4 52. Kxe3 Kc3 $19 {
[%csl Gc3,Ge3] Opposition}) 48... Kb6 49. Kc4 Kc6 {and now e.g.} 50. Kd4 Kb5
51. Kc3 e3 52. Kd3 Kxb4 53. Kxe3 Kc3 $19 {[%csl Gc3,Ge3] Opposition}) 48. Kb3
$2 {Too passive.} ({The active} 48. b5 $1 {saves the day:} Kc7 (48... Ka5 49.
Kc5 e3 50. b6 e2 51. b7 e1=Q 52. b8=Q $11 {(Golubev)}) 49. Kd4 Kb7 50. Kc3 $1
Kb6 51. Kc4 e3 52. Kd3 Kxb5 53. Kxe3 Kc4 54. Ke2 $11 {[%csl Gc2,Gc4,Ge2,Ge4]
Diagonal opposition. Opposition is, when all corners of the rectangle around
the kings have the same color: in this case are all light squares. The side
not to move has the opposition: here White.}) 48... Kb5 49. Kc3 e3 50. Kd3 Kxb4
51. Kxe3 Kc3 $1 {[%csl Ge1,Ge2,Ge3,Gf3] Opposition. The key squares are e1,e2,
e3 and f3.} 52. Ke2 Kc2 {[%csl Ge1,Ge2,Ge3][%cal Ga2h2] Opposition on the main
line, which goes through the middle of the 3 key squares e1,e2 and e3.} (52...
Kc4 $2 {blows it as the opposition after} 53. Kd2 Kd4 {[%csl Gd2,Gd4][%cal
Gd8d1] is not enough (e3 and f3 are only two adjacant key squares and so
opposition does not work in this direction) as it can not be improved to the
opposition in the direction left to right:} 54. Ke2 Ke4 55. Kf2 Kd3 56. Kf3 $1
$11 {[%csl Ge1,Ge2,Ge3,Gf3][%cal Ga3h3] and White has the all important
opposition.}) 53. Ke3 (53. Ke1 Kd3 $19) 53... Kd1 $1 {The typical way to
exploit the opposition.} 54. Kf2 ({The counterattack} 54. Kd4 Ke2 55. Ke5 Kf3
56. Kf6 Kxg3 57. Kxg6 {runs into} Kg4 $3 $19) 54... Kd2 55. Kf3 (55. Kf1 Ke3
$19) 55... Ke1 56. Ke3 (56. Kg2 Ke2 57. Kg1 Kf3 58. Kh2 Kf2 59. Kh3 Kg1 60. g4
hxg4+ 61. Kg3 Kf1 62. Kh2 Kf2 $19) 56... Kf1 57. Kf3 Kg1 {[%cal Gg1g3]} 0-1

