ecocodes
Volume A · Flank openings‹ A72A74 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

A73 Benoni Defense: Classical Variation, Main Line

A73 holds a single named line. It leaves A72 (Benoni Defense: Classical Variation) with 9.O-O. Lines filed under A75 reach its named position by a different move order. Both kings have castled by the end of the reference line, White on move 9 and Black on move 8.

Score sheet
#WhiteBlack
1d4Nf6
2c4c5
3d5e6
4Nc3exd5
5cxd5d6
6e4g6
7Nf3Bg7
8Be2O-O
9O-O

The move that completes A73

The reference line of A74 plays all of these moves and continues beyond them; A73 is the position reached at 9.O-O.

  1. 9.O-O White castles kingside, opening a line for the queen on d1, guarding the pawn on g2.

The road to A73

Two of the nine named positions on the way are reached by a move order other than their own.

  1. 1.d4 … 7...Bg7seven earlier stops: A40, A45, A50, A56, A60, A65, A70
  2. 8.Be2A70 Traditional Variation by another order
  3. 8...O-OA72 Classical Variation
  4. 9.O-OA73

The position after 9.O-O

White has brought out the knight on c3, knight on f3 and bishop on e2; Black the knight on f6 and bishop on g7. White has a half-open c-file; Black a half-open e-file. Black could capture with Nxd5, Nxe4. Black is to move and has 32 legal moves.

WhiteBlackMaterial (pawn units)3838Minor pieces developed32Moves spent on pawns55Pawns on d4, e4, d5, e520Squares attacked in the other half95castled kingside, move 9castled kingside, move 8

Codes that branch off from A73

The reference lines of two other codes leave A73 from the position after 9.O-O, each with its own moves.

CodeMovesReference line
A749...a6 10.a4Benoni Defense: Classical Variation, Full Line
A769...Re8Benoni Defense: Classical Variation, Czerniak Defense

Closest boards in other codes

CodeLineDiffers on
A77Benoni Defense: Classical Variation, Czerniak Defense, Tal Linefour squares: d2, f3, e8, f8
A63Benoni Defense: Fianchetto Variation, Hastings Defensesix squares: e2, g2, g3, e4, d7, b8
A75Benoni Defense: Classical Variation, Argentine Counterattacksix squares: a2, a4, g4, a6, a7, c8
A78Benoni Defense: Classical Variation, Czerniak Defensesix squares: d2, f3, a6, b8, e8, f8
E94King’s Indian Defense: Orthodox Variationsix squares: c4, d4, c5, d5, e5, c7
A68Benoni Defense: Four Pawns Attackseven squares: e1, f1, g1, h1, e2, f2, f4
A79Benoni Defense: Classical Variation, Czerniak Defenseseven squares: d2, f2, f3, a6, b8, e8, f8

Where lines continue from here

Seven named lines filed under other codes pass through the position after 9.O-O. Besides the codes above, they belong to A75, A77, A78, A79.

Volume A

  1. 00
  2. 01
  3. 02
  4. 03
  5. 04
  6. 05
  7. 06
  8. 07
  9. 08
  10. 09
  11. 10
  12. 11
  13. 12
  14. 13
  15. 14
  16. 15
  17. 16
  18. 17
  19. 18
  20. 19
  21. 20
  22. 21
  23. 22
  24. 23
  25. 24
  26. 25
  27. 26
  28. 27
  29. 28
  30. 29
  31. 30
  32. 31
  33. 32
  34. 33
  35. 34
  36. 35
  37. 36
  38. 37
  39. 38
  40. 39
  41. 40
  42. 41
  43. 42
  44. 43
  45. 44
  46. 45
  47. 46
  48. 47
  49. 48
  50. 49
  51. 50
  52. 51
  53. 52
  54. 53
  55. 54
  56. 55
  57. 56
  58. 57
  59. 58
  60. 59
  61. 60
  62. 61
  63. 62
  64. 63
  65. 64
  66. 65
  67. 66
  68. 67
  69. 68
  70. 69
  71. 70
  72. 71
  73. 72
  74. 73
  75. 74
  76. 75
  77. 76
  78. 77
  79. 78
  80. 79
  81. 80
  82. 81
  83. 82
  84. 83
  85. 84
  86. 85
  87. 86
  88. 87
  89. 88
  90. 89
  91. 90
  92. 91
  93. 92
  94. 93
  95. 94
  96. 95
  97. 96
  98. 97
  99. 98
  100. 99

Other move orders

  • Benoni Defense: Classical Variation, Main Line is also reached inside A75 Benoni Defense: Classical Variation, Argentine Counterattack, whose order is 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 exd5 5.cxd5 d6 6.Nc3 g6 7.e4 Bg7 8.Be2 O-O 9.O-O.

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