ecocodes
Volume E · Indian defenses‹ E49E51 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

E50 Nimzo-Indian Defense

E50 holds a single named line. It leaves E46 (Nimzo-Indian Defense: Normal Variation) with 5.Nf3. That final move, by the knight, opens a line for the rook on h1. Of all other reference positions, the board of E51 (Normal Variation, Ragozin Variation) comes closest, two squares apart.

Score sheet
#WhiteBlack
1d4Nf6
2c4e6
3Nc3Bb4
4e3O-O
5Nf3

The road to E50

  1. 1.d4 … 3...Bb4four earlier stops: A40, A45, A50, E20
  2. 4.e3E40 Rubinstein System
  3. 4...O-OE46 Normal Variation
  4. 5.Nf3E50

The position after 5.Nf3

White has brought out the knight on c3 and knight on f3; Black the knight on f6 and bishop on b4. Black could capture with Bxc3+. Black is to move and has 30 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed22Moves spent on pawns31Pawns on d4, e4, d5, e510Squares attacked in the other half54not castledcastled kingside, move 4

Codes that branch off from E50

The reference lines of one other code leave E50 from the position after 5.Nf3, each with its own moves.

CodeMovesReference line
E515...d5Nimzo-Indian Defense: Normal Variation, Ragozin Variation

Closest boards in other codes

CodeLineDiffers on
E47Nimzo-Indian Defense: Normal Variationfour squares: f1, g1, d3, f3
D55Queen’s Gambit Declined: Modern Variation, Normal Linesix squares: c1, b4, d5, g5, d7, e7
E21Nimzo-Indian Defense: Three Knights Variationsix squares: e2, e3, e8, f8, g8, h8
E40Nimzo-Indian Defense: Rubinstein Systemsix squares: g1, f3, e8, f8, g8, h8
E48Nimzo-Indian Defense: Normal Variation, Classical Defensesix squares: f1, g1, d3, f3, d5, d7
E52Nimzo-Indian Defense: Normal Variation, Schlechter Defensesix squares: f1, d3, d5, b6, b7, d7
E53Nimzo-Indian Defense: Normal Variation, Gligoric Systemsix squares: f1, d3, c5, d5, c7, d7

Where lines continue from here

Four named lines filed under other codes pass through the position after 5.Nf3. All of them belong to the codes 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
  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 Nimzo-Indian Defense codes