ecocodes
Volume B · Semi-open games‹ B65B67 ›
a1b2c3d4e5f6g7h8
Reference position · White to move

B66 Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, Early Deviations

B66 holds a single named line. It leaves B63 (Sicilian Defense: Richter-Rauzer Variation, Traditional Variation) with 7...a6. White, to move in that position, has 47 legal moves, the fifth-highest count of the 80 Sicilian Defense codes. Lines filed under B67 reach its named position by a different move order.

Score sheet
#WhiteBlack
1e4c5
2Nf3d6
3d4cxd4
4Nxd4Nf6
5Nc3Nc6
6Bg5e6
7Qd2a6

Moves only B66 plays

Same as B63 up to 7.Qd2, then:

  1. 7...a6 The a-pawn advances to a6, covering b5, opening a line for the rook on a8.

The road to B66

  1. 1.e4 … 6.Bg5nine earlier stops: B00, B20, B27, B50, B54, B56, B60
  2. 6...e6B62 Richter-Rauzer Variation
  3. 7.Qd2B63 Traditional Variation
  4. 7...a6B66

The position after 7...a6

White has brought out the knight on c3, knight on d4 and bishop on g5; Black the knight on c6 and knight on f6. White has a half-open d-file; Black a half-open c-file. White could capture with Bxa6, Bxf6, Nxc6, Nxe6.

WhiteBlackMaterial (pawn units)3838Minor pieces developed32Moves spent on pawns25Pawns on d4, e4, d5, e510Squares attacked in the other half94not castlednot castled

Codes that branch off from B66

The reference lines of one other code leave B66 from the position after 7...a6, each with its own moves.

CodeMovesReference line
B678.O-O-O Bd7Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation

Closest boards in other codes

CodeLineDiffers on
B62Sicilian Defense: Richter-Rauzer Variationfour squares: d1, d2, a6, a7
B95Sicilian Defense: Najdorf Variationfour squares: d1, d2, c6, b8
B60Sicilian Defense: Richter-Rauzer Variationsix squares: d1, d2, a6, e6, a7, e7
B61Sicilian Defense: Richter-Rauzer Variation, Modern Variationsix squares: a6, e6, a7, d7, e7, c8
B94Sicilian Defense: Najdorf Variationsix squares: d1, d2, c6, e6, e7, b8
B96Sicilian Defense: Najdorf Variationsix squares: d1, d2, f2, f4, c6, b8
B46Sicilian Defense: Taimanov Variationeight squares: c1, d1, d2, g5, d6, f6, d7, g8

Where lines continue from here

Three named lines filed under other codes pass through the position after 7...a6. Besides the codes above, they belong to B68, B69.

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: Richter-Rauzer Variation, Neo-Modern Variation, Early Deviations is also reached inside B67 Sicilian Defense: Richter-Rauzer Variation, Neo-Modern Variation, whose order is 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 d6 6.Bg5 e6 7.Qd2 a6.

Open this line in the finderAll Sicilian Defense codes