ecocodes
Volume E · Indian defenses‹ E11E13 ›
a1b2c3d4e5f6g7h8
Reference position · White to move

E12 Queen’s Indian Defense

E12 holds 18 named lines, all under the name Queen’s Indian Defense. It leaves E10 (Indian Defense: Anti-Nimzo-Indian) with 3...b6. Lines of nine other codes continue from its position, the widest spread of the 8 Queen’s Indian Defense codes. At six plies, its reference line is the shortest of the 8 Queen’s Indian Defense codes. With 18 named lines it is the second-largest code of the 8 Queen’s Indian Defense codes.

Score sheet
#WhiteBlack
1d4Nf6
2c4e6
3Nf3b6

The move that completes E12

The reference line of E13 plays all of these moves and continues beyond them; E12 is the position reached at 3...b6.

  1. 3...b6 The b-pawn advances to b6, covering a5 and c5, opening a line for the bishop on c8.

Lines filed under E12

All 18 share their first six plies, the whole reference line and then split three ways at White’s move 4.

NameAfter the shared startPliesAt the end
Queen’s Indian Defense(the shared start itself)6
Queen’s Indian Defense: Kasparov Variation4.Nc37
Queen’s Indian Defense: Miles Variation4.Bf47
Queen’s Indian Defense: Petrosian Variation4.a37
Queen’s Indian Defense: Kasparov-Petrosian Variation4.a3 Bb7 5.Nc39
Queen’s Indian Defense: Kasparov-Petrosian Variation, Andersson Variation4.a3 Bb7 5.Nc3 Ne410
Queen’s Indian Defense: Kasparov-Petrosian Variation, Hedgehog Variation4.a3 Bb7 5.Nc3 g610
Queen’s Indian Defense: Kasparov-Petrosian Variation, Main Line4.a3 Bb7 5.Nc3 d510
Queen’s Indian Defense: Kasparov-Petrosian Variation, Marco Defense4.a3 Bb7 5.Nc3 Be710
Queen’s Indian Defense: Petrosian Variation, Farago Defense4.a3 Ba6 5.Qc2 Bb710
Queen’s Indian Defense: Kasparov-Petrosian Variation, Classical Variation4.a3 Bb7 5.Nc3 d5 6.cxd5 exd512
Queen’s Indian Defense: Kasparov-Petrosian Variation, Modern Variation4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd512
Queen’s Indian Defense: Kasparov-Petrosian Variation, Kasparov Attack4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd5 7.Qc213
Queen’s Indian Defense: Kasparov-Petrosian Variation, Petrosian Attack4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd5 7.e313
Queen’s Indian Defense: Kasparov-Petrosian Variation, Polovodin Gambit4.Nc3 Bb7 5.a3 d5 6.cxd5 Nxd5 7.e413
Queen’s Indian Defense: Kasparov-Petrosian Variation, Rashkovsky Attack4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd5 7.Qa4+13check
Queen’s Indian Defense: Kasparov-Petrosian Variation, Romanishin Attack4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd5 7.Bd213
Queen’s Indian Defense: Kasparov Variation, Botvinnik Attack4.Nc3 Bb7 5.Bg5 h6 6.Bh4 g5 7.Bg3 Nh514

The road to E12

  1. 1.d4 … 1...Nf6two earlier stops: A40, A45
  2. 2.c4A50 Normal Variation
  3. 3.Nf3E10 Anti-Nimzo-Indian
  4. 3...b6E12

The position after 3...b6

White has brought out the knight on f3; Black the knight on f6. White is to move and has 32 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed11Moves spent on pawns22Pawns on d4, e4, d5, e510Squares attacked in the other half64not castlednot castled

Codes that branch off from E12

The reference lines of three other codes leave E12 from two of its named positions; “From” gives the last part of that position’s name.

CodeFromMovesReference line
E13Kasparov Variation4...Bb4 5.Bg5 h6 6.Bh4 Bb7Queen’s Indian Defense: Kasparov Variation
E14Queen’s Indian Defense4.e3Queen’s Indian Defense: Spassky System
E15Queen’s Indian Defense4.g3Queen’s Indian Defense: Fianchetto Variation

Closest boards in other codes

CodeLineDiffers on
A47Pseudo Queen’s Indian Defensefour squares: c2, c4, e6, e7
E11Bogo-Indian Defensefour squares: b4, b6, b7, f8
A32English Opening: Symmetrical Variation, Anti-Benoni Variation, Spielmann Defensefive squares: f3, d4, b6, b7, c7
A31English Opening: Symmetrical Variation, Anti-Benoni Variationsix squares: c5, b6, e6, b7, c7, e7
A46Indian Defense: Knights Variationsix squares: c2, c4, b6, e6, b7, e7
A50Indian Defense: Normal Variationsix squares: g1, f3, b6, e6, b7, e7
A51Indian Defense: Budapest Gambitsix squares: g1, f3, e5, b6, e6, b7

Where lines continue from here

Besides the codes above, they belong to D55, E11, E16, E17, E18, E19.

Volume D

  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

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
  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
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  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

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