ecocodes
Volume B · Semi-open games‹ B89B91 ›
a1b2c3d4e5f6g7h8
Reference position · White to move

B90 Sicilian Defense: Najdorf Variation

B90 holds 15 named lines, all under the name Sicilian Defense. It leaves B54 (Sicilian Defense: Modern Variations, Main Line) with 5.Nc3 a6. Lines filed under B92 reach one of its named positions by a different move order. That final move, by the a-pawn, covers b5 and opens a line for the rook on a8.

Score sheet
#WhiteBlack
1e4c5
2Nf3d6
3d4cxd4
4Nxd4Nf6
5Nc3a6

Lines filed under B90

All 15 share their first ten plies, the whole reference line and then split six ways at White’s move 6.

NameAfter the shared startPlies
Sicilian Defense: Najdorf Variation(the shared start itself)10
Sicilian Defense: Najdorf Variation, Adams Attack6.h311
Sicilian Defense: Najdorf Variation, Dekker Gambit6.g411
Sicilian Defense: Najdorf Variation, English Attack6.Be311
Sicilian Defense: Najdorf Variation, Lipnitsky Attack6.Bc411
Sicilian Defense: Najdorf Variation, Petronić Attack6.Rg111
Sicilian Defense: Najdorf Variation, Yates Variation6.Bd311
Sicilian Defense: Najdorf Variation, English Attack, Anti-English6.Be3 Ng412
Sicilian Defense: Scheveningen Variation, Delayed Keres Attack6.Be3 e6 7.g413
Sicilian Defense: Scheveningen Variation, English Attack, with f36.Be3 e6 7.f313
Sicilian Defense: Najdorf Variation, English Attack6.Be3 e5 7.Nb3 Be6 8.f315
Sicilian Defense: Najdorf Variation, English Attack6.Be3 e5 7.Nb3 Be7 8.f315
Sicilian Defense: Najdorf Variation, English Attack6.Be3 e5 7.Nb3 Be6 8.h315
Sicilian Defense: Najdorf Variation, English Attack6.Be3 e5 7.Nb3 Be7 8.h315
Sicilian Defense: Scheveningen Variation, Delayed Keres Attack, Perenyi Gambit6.Be3 e6 7.g4 e5 8.Nf5 g6 9.g517

The road to B90

  1. 1.e4 … 3.d4five earlier stops: B00, B20, B27, B50
  2. 3...cxd4B50 Sicilian Defense
  3. 4...Nf6B54 Main Line
  4. 5...a6B90

The position after 5...a6

White has brought out the knight on c3 and knight on d4; Black the knight on f6. White has a half-open d-file; Black a half-open c-file. White could capture with Bxa6. White is to move and has 43 legal moves.

WhiteBlackMaterial (pawn units)3838Minor pieces developed21Moves spent on pawns24Pawns on d4, e4, d5, e510Squares attacked in the other half93not castlednot castled

Codes that branch off from B90

The reference lines of five other codes leave B90 from two of its named positions; “From” gives the last part of that position’s name.

CodeFromMovesReference line
B87Lipnitsky Attack6...e6 7.Bb3 b5Sicilian Defense: Sozin Attack, Flank Variation
B91Najdorf Variation6.g3Sicilian Defense: Najdorf Variation, Zagreb Variation
B92Najdorf Variation6.Be2Sicilian Defense: Najdorf Variation, Opocensky Variation
B93Najdorf Variation6.f4Sicilian Defense: Najdorf Variation, Amsterdam Variation
B94Najdorf Variation6.Bg5Sicilian Defense: Najdorf Variation

Closest boards in other codes

CodeLineDiffers on
B56Sicilian Defense: Classical Variationfour squares: a6, c6, a7, b8
B70Sicilian Defense: Dragon Variationfour squares: a6, g6, a7, g7
B80Sicilian Defense: Scheveningen Variationfour squares: a6, e6, a7, e7
B95Sicilian Defense: Najdorf Variationfour squares: c1, g5, e6, e7
B43Sicilian Defense: Kan Variation, Knight Variationsix squares: d6, e6, f6, d7, e7, g8
B57Sicilian Defense: Classical Variation, Sozin Attacksix squares: f1, c4, a6, c6, a7, b8
B58Sicilian Defense: Classical Variationsix squares: f1, e2, a6, c6, a7, b8

Where lines continue from here

Twenty-six named lines filed under other codes pass through the position after 5...a6. Besides the codes above, they belong to B80, B84, B85, B95, B96, B97, B98, B99.

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
  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

  • Sicilian Defense: Najdorf Variation is also reached inside B92 Sicilian Defense: Najdorf Variation, Opocensky Variation, whose order is 1.e4 c5 2.Nf3 Nf6 3.Nc3 d6 4.d4 cxd4 5.Nxd4 a6.

Open this line in the finderAll Sicilian Defense codes