[Event "Chigorin Memorial Open"]
[Site "St Petersburg RUS"]
[Date "2011.10.21"]
[Round "8.16"]
[White "Kovalenko, I."]
[Black "Levin, Ev"]
[Result "1-0"]
[ECO "E92"]
[WhiteElo "2578"]
[BlackElo "2481"]
[Annotator "Müller,Karsten"]
[PlyCount "145"]
[EventDate "2011.10.14"]
[EventType "swiss"]
[EventRounds "9"]
[EventCountry "RUS"]
[Source "Mark Crowther"]
[SourceDate "2011.10.24"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Be2 O-O 6. Nf3 e5 7. d5 a5 8. Bg5 h6
9. Bh4 Na6 10. Nd2 Bd7 11. O-O Qe8 12. Bxf6 Bxf6 13. Bg4 Nc5 14. Bxd7 Qxd7 15.
Nb3 Be7 16. Nxc5 dxc5 17. Qd2 Bg5 18. Qd3 f5 19. Qh3 Qg7 20. Rad1 Be7 21. Rd3
Kh7 22. Re1 Bd6 23. Kf1 Rf6 24. Re2 Raf8 25. Ke1 f4 26. f3 h5 27. Rf2 g5 28. g4
h4 29. Qf1 Ra8 30. Nb5 Qd7 31. Rc2 Rff8 32. Qe2 Ra6 33. Ra3 Rfa8 34. Ra4 Kg7
35. Qd2 Kf6 36. Rc3 b6 37. h3 Ke7 38. Rc1 Kf6 39. Ra1 Ke7 40. Kd1 Kf6 41. Kc2
Ke7 42. Qe1 Kf6 43. a3 Qc8 44. b3 Ke7 45. Kb2 Qb7 46. Qd2 Qc8 47. Ra2 Qb7 48.
Kb1 Qc8 49. Qb2 Kf6 50. Qa1 Qb7 51. Qb2 Qc8 52. Qc2 Qb7 53. Nc3 R8a7 54. Ne2
Qa8 55. Qb2 Qe8 56. Nc1 Qa8 57. Qc3 Qe8 58. Nd3 Qa8 59. Qc2 Ke7 60. Qb2 Kf6 61.
b4 axb4 62. Rxa6 Rxa6 63. axb4 cxb4 64. Nxb4 Bxb4 65. Rxa6 Qxa6 66. Qxb4 Kf7
67. Kb2 Ke8 68. Kb3 Kd8 69. Qa3 Qxa3+ 70. Kxa3 {[%csl Ra4,Gb3,Yb4,Gb5,Gd6,Yd7,
Re7] In this case Black must be able to meet Kb5 with Kd6 and Kb4 with Kd7 to
answer 1.c5 with the counterblow 1...c6! the point of the defense. So Ka4 must
be met by Ke7 to be able to reach d7 and d6. So it seems to be drawn by 70...
Ke8 but this misses one point. After Kb3 White threatens the pawn advance
c4-c5 so Black must be able to answer Kb3 with Kd6 which completes the system
of corresponding squares. As Black can not win the fight for the
correspondence he loses, whatever he does:} Kd7 (70... Ke8 $5 {is more tricky:}
71. Kb3 $1 Ke7 (71... Kd8 72. c5 bxc5 73. Kc4 Kc8 74. Kxc5 Kd7 {[%csl Rb4,Yb5,
Rc4,Gc5,Yd6,Gd7,Re7] now a triangulation decides:} 75. Kc4 Ke7 (75... Kd6 76.
Kb5 $18) (75... c6 76. Kc5 cxd5 77. Kxd5 $18) 76. Kb4 Kd6 77. Kb5 Kd7 78. Kc5
$18) 72. Ka4 $1 Kd7 73. Kb4 $1 Kd6 74. Kb5 $1 $18) 71. Ka4 $2 {White gives
Black the correspondence.} (71. Kb4 $1 {wins as} c6 {is met by} 72. Kc3 b5 (
72... cxd5 73. cxd5 Kc8 74. Kc4 Kd7 75. Kb5 Kc7 76. Ka6 $18) (72... c5 73. Kb3
$18 {[%cal Gb3a4,Ga4b5]}) (72... Kd6 73. dxc6 Kxc6 74. Kb4 {transposes to the
game.}) 73. dxc6+ Kxc6 74. Kb4 bxc4 75. Kxc4 $18 {[%csl Gb5,Gc5,Gd5]}) (71. Kb3
$2 Kd6 $1 $11) 71... c6 $2 (71... Ke7 $1 {keeps the correspondence and draws
due to} 72. Kb4 (72. Kb5 Kd6 73. Kb4 c6 74. dxc6 Kxc6 75. Kb3 Kc5 76. Kc3 b5
77. cxb5 Kxb5 78. Kb3 $11) 72... Kd7 73. c5 (73. Kb5 Kd6 $11) 73... c6 $3 {the
hidden counterblow} 74. cxb6 cxd5 75. exd5 e4 76. Kc3 (76. fxe4 $2 f3 77. d6 f2
78. b7 f1=Q 79. b8=Q Qb1+ $19) 76... e3 77. Kd3 Kd6 $11) (71... Kd6 $2 72. Kb5
Kd7 73. c5 bxc5 74. Kxc5 Ke7 75. Kc6 Kd8 76. d6 Kc8 77. Kd5 $18) 72. dxc6+ Kxc6
73. Kb4 (73. Kb4 Kc7 74. Kb5 Kb7 75. c5 bxc5 76. Kxc5 Ka6 77. Kd5 Kb5 78. Kxe5
Kc4 79. Kf5 Kd4 80. e5 Ke3 81. e6 Kxf3 82. e7 Kg2 83. e8=Q f3 84. Qe4 $18) 1-0

