ecocodes
Volume A · Flank openings‹ A49A51 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

A50 Indian Defense: Normal Variation

Also filed here: Mexican Defense, Queen’s Indian Accelerated, Slav Indian.

A50 holds seven named lines from four openings, most of them (three) under Indian Defense. It leaves A45 (Indian Defense) with 2.c4. Black, to move in that position, has 22 legal moves, level for the fewest of the 8 Indian Defense codes. Lines of 182 other codes continue from its position, the second-widest spread of the 8 Indian Defense codes. At three plies, its reference line is the second-shortest of the 8 Indian Defense codes.

Score sheet
#WhiteBlack
1d4Nf6
2c4

The move that completes A50

The reference line of A51 plays all of these moves and continues beyond them; A50 is the position reached at 2.c4.

  1. 2.c4 The c-pawn advances two squares to c4, covering b5 and d5, opening a line for the queen on d1.

Lines filed under A50

All seven share their first three plies, the whole reference line and then split five ways at Black’s move 2.

NameAfter the shared startPlies
Indian Defense: Normal Variation(the shared start itself)3
Indian Defense: Medusa Gambit2...g54
Indian Defense: Pyrenees Gambit2...b54
Mexican Defense2...Nc64
Queen’s Indian Accelerated2...b64
Slav Indian2...c64
Mexican Defense: Horsefly Gambit2...Nc6 3.d5 Ne5 4.f47

The road to A50

  1. 1.d4A40 Queen’s Pawn Game
  2. 1...Nf6A45 Indian Defense
  3. 2.c4A50

The position after 2.c4

Black has brought out the knight on f6; White has not yet moved a knight or bishop.

WhiteBlackMaterial (pawn units)3939Minor pieces developed01Moves spent on pawns20Pawns on d4, e4, d5, e510Squares attacked in the other half62not castlednot castled

Codes that branch off from A50

The reference lines of seven other codes leave A50 from the position after 2.c4, each with its own moves.

CodeMovesReference line
A512...e5Indian Defense: Budapest Gambit
A532...d6Old Indian Defense
A562...c5Benoni Defense
E002...e6 3.g3Catalan Opening
E102...e6 3.Nf3Indian Defense: Anti-Nimzo-Indian
E202...e6 3.Nc3 Bb4Nimzo-Indian Defense
E602...g6Indian Defense: West Indian Defense

Closest boards in other codes

CodeLineDiffers on
A15English Opening: Anglo-Indian Defensetwo squares: d2, d4
A10English Openingfour squares: d2, d4, f6, g8
A16English Opening: Anglo-Indian Defense, Queen’s Knight Variationfour squares: b1, d2, c3, d4
A31English Opening: Symmetrical Variation, Anti-Benoni Variationfour squares: g1, f3, c5, c7
A40Queen’s Pawn Gamefour squares: c2, c4, f6, g8
A46Indian Defense: Knights Variationfour squares: g1, c2, f3, c4
A84Dutch Defensefour squares: f5, f6, f7, g8

Where lines continue from here

Besides the codes above, they belong to A31, A52, A54, A55, A57, A58, A59, A60, A61, A62, A63, A64, A65, A66, A67, A68, A69, A70, A71, A72, A73, A74, A75, A76, A77, A78, A79, D30, D32, D34, D35, D36, D37, D38, D39, D40, D41, D42, D44, D53, D54, D55, D56, D57, D58, D60, D62, D63, D64, D68, D70, D71, D72, D73, D74, D75, D76, D78, D79, D80, D81, D82, D83, D84, D85, D86, D87, D88, D89, D90, D91, D92, D93, D94, D95, D96, D97, D98, D99, E01, E02, E03, E04, E05, E06, E07, E08, E09, E11, E12, E13, E14, E15, E16, E17, E18, E19, E21, E22, E23, E24, E25, E26, E27, E28, E29, E30, E31, E32, E33, E34, E35, E36, E37, E38, E39, E40, E41, E42, E43, E44, E45, E46, E47, E48, E49, E50, E51, E52, E53, E54, E55, E56, E57, E58, E59, E61, E62, E63, E64, E65, E66, E67, E68, E69, E70, E71, E72, E73, E74, E75, E76, E77, E78, E79, E80, E81, E82, E83, E84, E85, E86, E87, E88, E89, E90, E91, E92, E93, E94, E95, E96, E97, E98, E99.

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

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
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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

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

Other move orders

  • Indian Defense: Normal Variation is also reached inside A31 English Opening: Symmetrical Variation, Anti-Benoni Variation, whose order is 1.c4 Nf6 2.d4.

Open this line in the finderAll Indian Defense codes