ecocodes
Volume A · Flank openings‹ A73A75 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

A74 Benoni Defense: Classical Variation, Full Line

A74 holds a single named line. It leaves A73 (Benoni Defense: Classical Variation, Main Line) with 9...a6 10.a4. Lines filed under A75 reach its named position by a different move order. At 19 plies, its reference line is the fifth-longest of the 23 Benoni Defense codes. 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-Oa6
10a4

Moves only A74 plays

Same as A73 up to 9.O-O, then:

  1. 9...a6 The a-pawn advances to a6, covering b5, opening a line for the rook on a8.
  2. 10.a4 The a-pawn advances two squares to a4, covering b5, opening a line for the rook on a1.

The road to A74

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

  1. 1.d4 … 8.Be2eight earlier stops: A40, A45, A50, A56, A60, A65, A70
  2. 8...O-OA72 Classical Variation
  3. 9.O-OA73 Main Line
  4. 10.a4A74

The position after 10.a4

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 31 legal moves.

WhiteBlackMaterial (pawn units)3838Minor pieces developed32Moves spent on pawns66Pawns on d4, e4, d5, e520Squares attacked in the other half95castled kingside, move 9castled kingside, move 8

Codes that branch off from A74

The reference lines of one other code leave A74 from the position after 10.a4, each with its own moves.

CodeMovesReference line
A7510...Bg4Benoni Defense: Classical Variation, Argentine Counterattack

Closest boards in other codes

CodeLineDiffers on
A76Benoni Defense: Classical Variation, Czerniak Defensesix squares: a2, a4, a6, a7, e8, f8
A72Benoni Defense: Classical Variationeight squares: e1, f1, g1, h1, a2, a4, a6, a7
A77Benoni Defense: Classical Variation, Czerniak Defense, Tal Lineeight squares: a2, d2, f3, a4, a6, a7, e8, f8
A78Benoni Defense: Classical Variation, Czerniak Defensenine squares: a2, d2, f3, a4, a6, a7, b8, e8 …
A63Benoni Defense: Fianchetto Variation, Hastings Defenseten squares: a2, e2, g2, g3, a4, e4, a6, a7 …
A64Benoni Defense: Fianchetto Variation, Hastings Defense, Main Lineten squares: d2, e2, g2, f3, g3, e4, d7, b8 …
A79Benoni Defense: Classical Variation, Czerniak Defenseten squares: a2, d2, f2, f3, a4, a6, a7, b8 …

Where lines continue from here

One named line filed under other codes passes through the position after 10.a4. It belongs to the code listed above.

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, Full 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 a6 10.a4.

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