ecocodes
Volume E · Indian defenses‹ E90E92 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

E91 King’s Indian Defense: Orthodox Variation

E91 holds two named lines, all under the name King’s Indian Defense. It leaves E90 (King’s Indian Defense: Normal Variation, Rare Defenses) with 5...O-O 6.Be2. That final move, by the bishop, opens a line for the rook on h1. Of all other reference positions, the board of E92 (Orthodox Variation) comes closest, two squares apart.

Score sheet
#WhiteBlack
1d4Nf6
2c4g6
3Nc3Bg7
4e4d6
5Nf3O-O
6Be2

Lines filed under E91

Both share their first 11 plies, the whole reference line.

NameAfter the shared startPliesAt the end
King’s Indian Defense: Orthodox Variation(the shared start itself)11Black castled
King’s Indian Defense: Kazakh Variation6...Na612Black castled

King’s Indian Defense: Kazakh Variation

  1. 6...Na6 The knight leaves b8 for a6, opening a line for the rook on a8.

The road to E91

  1. 1.d4 … 4.e4six earlier stops: A40, A45, A50, E60, E61, E70
  2. 4...d6E70 Normal Variation
  3. 5.Nf3E90 Rare Defenses
  4. 6.Be2E91

The position after 6.Be2

White has brought out the knight on c3, knight on f3 and bishop on e2; Black the knight on f6 and bishop on g7. Black could capture with Nxe4. Black is to move and has 32 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed32Moves spent on pawns32Pawns on d4, e4, d5, e520Squares attacked in the other half73not castledcastled kingside, move 5

Codes that branch off from E91

The reference lines of one other code leave E91 from the position after 6.Be2, each with its own moves.

CodeMovesReference line
E926...e5King’s Indian Defense: Orthodox Variation

Closest boards in other codes

CodeLineDiffers on
E77King’s Indian Defense: Four Pawns Attackfour squares: g1, f2, f3, f4
E78King’s Indian Defense: Four Pawns Attack, Fluid Attackfour squares: f2, f4, c5, c7
D97Grünfeld Defense: Russian Variationfive squares: d1, f1, e2, c4, d6
E81King’s Indian Defense: Sämisch Variation, Normal Defensefive squares: f1, g1, e2, f2, f3
A72Benoni Defense: Classical Variationsix squares: c4, d4, c5, d5, c7, e7
E67King’s Indian Defense: Fianchetto Variation, Debrecen Defensesix squares: e2, g2, g3, e4, d7, b8
E73King’s Indian Defense: Normal Variation, Standard Developmentsix squares: g1, f3, e8, f8, g8, h8

Where lines continue from here

Twenty-five named lines filed under other codes pass through the position after 6.Be2. Besides the codes above, they belong to E93, E94, E95, E96, E97, E98, E99.

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
  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

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