ecocodes
Volume E · Indian defenses‹ E17E19 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

E18 Queen’s Indian Defense: Classical Variation, Traditional Variation

E18 holds three named lines, all under the name Queen’s Indian Defense. It leaves E17 (Queen’s Indian Defense: Classical Variation) with 6...O-O 7.Nc3. White has three minor pieces off their first squares, level for the most of the 8 Queen’s Indian Defense codes. At 13 plies, its reference line is the second-longest of the 8 Queen’s Indian Defense codes. Black, to move in that position, has 33 legal moves, the second-highest count of the 8 Queen’s Indian Defense codes.

Score sheet
#WhiteBlack
1d4Nf6
2c4e6
3Nf3b6
4g3Bb7
5Bg2Be7
6O-OO-O
7Nc3

The move that completes E18

The reference line of E19 plays all of these moves and continues beyond them; E18 is the position reached at 7.Nc3.

  1. 7.Nc3 The knight leaves b1 for c3, opening a line for the rook on a1.

Lines filed under E18

All three share their first 13 plies, the whole reference line and then split two ways at Black’s move 7.

NameAfter the shared startPliesAt the end
Queen’s Indian Defense: Classical Variation, Traditional Variation(the shared start itself)13both castled
Queen’s Indian Defense: Classical Variation, Tiviakov Defense7...Na614both castled
Queen’s Indian Defense: Classical Variation, Traditional Variation, Nimzowitsch Line7...d514both castled

Queen’s Indian Defense: Classical Variation, Tiviakov Defense

  1. 7...Na6 The knight leaves b8 for a6, opening a line for the rook on a8 and the queen on d8.

Queen’s Indian Defense: Classical Variation, Traditional Variation, Nimzowitsch Line

  1. 7...d5 The d-pawn advances two squares to d5, covering c4 and e4, opening a line for the queen on d8.

The road to E18

  1. 1.d4 … 5.Bg2seven earlier stops: A40, A45, A50, E10, E12, E15
  2. 5...Be7E17 Traditional Variation
  3. 6.O-OE17 Classical Variation
  4. 7.Nc3E18

The position after 7.Nc3

White has brought out the knight on c3, knight on f3 and bishop on g2; Black the knight on f6, bishop on b7 and bishop on e7. Black could capture with Bxf3.

WhiteBlackMaterial (pawn units)3939Minor pieces developed33Moves spent on pawns32Pawns on d4, e4, d5, e510Squares attacked in the other half65castled kingside, move 6castled kingside, move 6

Codes that branch off from E18

The reference lines of one other code leave E18 from the position after 7.Nc3, each with its own moves.

CodeMovesReference line
E197...Ne4 8.Qc2 Nxc3 9.Qxc3Queen’s Indian Defense: Classical Variation, Traditional Variation, Main Line

Closest boards in other codes

CodeLineDiffers on
E07Catalan Opening: Closedeight squares: b1, c3, d5, b6, b7, d7, b8, c8
A95Dutch Defense: Stonewall Variationnine squares: d5, f5, b6, c6, b7, c7, d7, f7 …
A96Dutch Defense: Classical Variationnine squares: b1, c3, f5, b6, d6, b7, d7, f7 …
A97Dutch Defense: Classical Variation, Ilyin-Zhenevsky Variationnine squares: f5, b6, d6, b7, d7, f7, c8, d8 …
E08Catalan Opening: Closedten squares: b1, d1, c2, c3, d5, b6, b7, d7 …
A39English Opening: Symmetrical Variation, Mecking Variation11 squares: c5, b6, c6, e6, g6, b7, c7, e7 …
A92Dutch Defense: Classical Variation11 squares: b1, e1, f1, g1, h1, c3, f5, b6 …

Where lines continue from here

One named line filed under other codes passes through the position after 7.Nc3. It belongs to the code listed above.

Volume E

  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
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  28. 27
  29. 28
  30. 29
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  32. 31
  33. 32
  34. 33
  35. 34
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  40. 39
  41. 40
  42. 41
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  44. 43
  45. 44
  46. 45
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  49. 48
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  51. 50
  52. 51
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  54. 53
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  64. 63
  65. 64
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  70. 69
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  72. 71
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  90. 89
  91. 90
  92. 91
  93. 92
  94. 93
  95. 94
  96. 95
  97. 96
  98. 97
  99. 98
  100. 99

Open this line in the finderAll Queen’s Indian Defense codes