ecocodes
Volume A · Flank openings‹ A77A79 ›
a1b2c3d4e5f6g7h8
Reference position · White to move

A78 Benoni Defense: Classical Variation, Czerniak Defense

A78 holds a single named line. It leaves A77 (Benoni Defense: Classical Variation, Czerniak Defense, Tal Line) with 10...Na6. At 20 plies, its reference line is the third-longest of the 23 Benoni Defense codes. Lines filed under A79 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
2c4e6
3Nf3c5
4d5exd5
5cxd5d6
6Nc3g6
7e4Bg7
8Be2O-O
9O-ORe8
10Nd2Na6

Moves only A78 plays

Same as A75 up to 9.O-O, then:

  1. 9...Re8 The rook goes from f8 to e8.
  2. 10.Nd2 The knight goes from f3 to d2, opening a line for the bishop on e2.
  3. 10...Na6 The knight leaves b8 for a6, opening a line for the rook on a8.

The road to A78

Four of the 11 named positions on the way are reached by a move order other than their own.

  1. 1.d4 … 9.O-Onine earlier stops: A40, A45, A50, A61, A70, A72, A73, E10
  2. 9...Re8A76 Czerniak Defense by another order
  3. 10.Nd2A77 Tal Line by another order
  4. 10...Na6A78

The position after 10...Na6

White has brought out the knight on c3, knight on d2 and bishop on e2; Black the knight on a6, knight on f6 and bishop on g7. White has a half-open c-file; Black a half-open e-file. White could capture with Bxa6. White is to move and has 32 legal moves.

WhiteBlackMaterial (pawn units)3838Minor pieces developed33Moves spent on pawns55Pawns on d4, e4, d5, e520Squares attacked in the other half75castled kingside, move 9castled kingside, move 8

Codes that branch off from A78

The reference lines of one other code leave A78 from the position after 10...Na6, each with its own moves.

CodeMovesReference line
A7911.f3Benoni Defense: Classical Variation, Czerniak Defense

Closest boards in other codes

CodeLineDiffers on
A76Benoni Defense: Classical Variation, Czerniak Defensefour squares: d2, f3, a6, b8
A73Benoni Defense: Classical Variation, Main Linesix squares: d2, f3, a6, b8, e8, f8
A64Benoni Defense: Fianchetto Variation, Hastings Defense, Main Linenine squares: a2, e2, g2, g3, a4, e4, a6, a7 …
A74Benoni Defense: Classical Variation, Full Linenine squares: a2, d2, f3, a4, a6, a7, b8, e8 …
A63Benoni Defense: Fianchetto Variation, Hastings Defenseten squares: d2, e2, g2, f3, g3, e4, a6, d7 …
A69Benoni Defense: Four Pawns Attack, Main Lineten squares: e1, f1, g1, h1, d2, f2, f3, f4 …
A72Benoni Defense: Classical Variationten squares: e1, f1, g1, h1, d2, f3, a6, b8 …

Where lines continue from here

One named line filed under other codes passes through the position after 10...Na6. 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, Czerniak Defense is also reached inside A79 Benoni Defense: Classical Variation, Czerniak Defense, whose order is 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2 Na6.

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