ecocodes
Volume B · Semi-open games‹ B03B05 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

B04 Alekhine Defense: Modern Variation

B04 holds six named lines, all under the name Alekhine Defense. It leaves B03 (Alekhine Defense) with 4.Nf3. That final move, by the knight, opens a line for the rook on h1. Of all other reference positions, the board of B05 (Modern Variation, Main Line) comes closest, two squares apart.

Score sheet
#WhiteBlack
1e4Nf6
2e5Nd5
3d4d6
4Nf3

Lines filed under B04

All six share their first seven plies, the whole reference line and then split four ways at Black’s move 4.

NameAfter the shared startPliesAt the end
Alekhine Defense: Modern Variation(the shared start itself)7
Alekhine Defense: Modern Variation, Alburt Variation4...g68
Alekhine Defense: Modern Variation, Larsen Variation4...dxe58Black +1
Alekhine Defense: Modern Variation, Larsen-Haakert Variation4...Nc68
Alekhine Defense: Modern Variation, Schmid Variation4...Nb68
Alekhine Defense: Modern Variation, Keres Variation4...g6 5.Bc4 Nb6 6.Bb3 Bg7 7.a413

The road to B04

  1. 1.e4 … 2...Nd5three earlier stops: B00, B02
  2. 3.d4B03 Alekhine Defense
  3. 3...d6B03 Alekhine Defense
  4. 4.Nf3B04

The position after 4.Nf3

White has brought out the knight on f3; Black the knight on d5. Black could capture with dxe5. Black is to move and has 31 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed11Moves spent on pawns31Pawns on d4, e4, d5, e520Squares attacked in the other half86not castlednot castled

Codes that branch off from B04

The reference lines of one other code leave B04 from the position after 4.Nf3, each with its own moves.

CodeMovesReference line
B054...Bg4Alekhine Defense: Modern Variation, Main Line

Closest boards in other codes

CodeLineDiffers on
D02Queen’s Pawn Game: Zukertort Variationfive squares: e2, d5, e5, d6, g8
D04Queen’s Pawn Game: Colle Systemfive squares: e3, d5, e5, d6, f6
A41Queen’s Pawn Gamesix squares: g1, e2, f3, d5, e5, g8
A46Indian Defense: Knights Variationsix squares: e2, d5, e5, d6, f6, d7
A06Zukertort Openingseven squares: d2, e2, d4, d5, e5, d6, g8
B07King’s Pawn Game: Maróczy Defenseseven squares: g1, f3, e4, d5, e5, e7, g8
B53Sicilian Defense: Chekhover Variationseven squares: d1, d4, e4, d5, e5, c7, g8

Where lines continue from here

Five named lines filed under other codes pass through the position after 4.Nf3. All of them belong to the codes listed above.

Volume B

  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
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  38. 37
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  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
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  78. 77
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  81. 80
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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 Alekhine Defense codes