ecocodes
Volume D · Closed and semi-closed games‹ D45D47 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

D46 Semi-Slav Defense: Main Line

D46 holds 12 named lines, all under the name Semi-Slav Defense. It leaves D45 (Semi-Slav Defense: Normal Variation) with 6.Bd3. With 12 named lines it is the second-largest code of the 7 Semi-Slav Defense codes. Black, to move in that position, has 31 legal moves, the second-lowest count of the 7 Semi-Slav Defense codes. White’s pieces and pawns attack eight squares in Black’s half, the second-highest count of the 7 Semi-Slav Defense codes.

Score sheet
#WhiteBlack
1d4d5
2c4c6
3Nc3Nf6
4e3e6
5Nf3Nbd7
6Bd3

The move that completes D46

The reference line of D47 plays all of these moves and continues beyond them; D46 is the position reached at 6.Bd3.

  1. 6.Bd3 The bishop leaves f1 for d3, opening a line for the rook on h1.

Lines filed under D46

All 12 share the start 1.d4 d5 2.c4 c6 and then split two ways at White’s move 3.

NameAfter the shared startPliesAt the end
Semi-Slav Defense: Main Line3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd311
Semi-Slav Defense: Bogoljubow Variation3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 Be712
Semi-Slav Defense: Chigorin Defense3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 Bd612
Semi-Slav Defense: Romih Variation3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 Bb412
Semi-Slav Defense: Chigorin Defense3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 Bd6 7.Qc213
Semi-Slav Defense: Chigorin Defense3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.b3 Bd6 7.Bb2 O-O 8.Bd315Black castled
Semi-Slav Defense: Chigorin Defense3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc2 b6 7.b3 Bb7 8.Bd315
Semi-Slav Defense: Chigorin Defense3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc2 Bd6 7.b3 O-O 8.Bb2 Re8 9.Bd317Black castled
Semi-Slav Defense: Chigorin Defense3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc2 Bd6 7.b3 O-O 8.Bb2 Qe7 9.Bd317Black castled
Semi-Slav Defense: Chigorin Defense3.Nf3 e6 4.e3 Nf6 5.Nc3 Bd6 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 Nbd7 9.O-O O-O 10.Qc219both castled
Semi-Slav Defense: Main Line3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc2 b6 7.b3 Bb7 8.Bd3 Be7 9.O-O O-O 10.Bb219both castled
Semi-Slav Defense: Chigorin Defense3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 Bd6 9.O-O Bb7 10.a3 O-O 11.Qc221both castled

The road to D46

  1. 1.d4 … 4...e6five earlier stops: A40, D00, D06, D10
  2. 5.Nf3D45 Main Line
  3. 5...Nbd7D45 Normal Variation
  4. 6.Bd3D46

The position after 6.Bd3

White has brought out the knight on c3, knight on f3 and bishop on d3; Black the knight on d7 and knight on f6. Black could capture with dxc4.

WhiteBlackMaterial (pawn units)3939Minor pieces developed32Moves spent on pawns33Pawns on d4, e4, d5, e511Squares attacked in the other half85not castlednot castled

Codes that branch off from D46

The reference lines of one other code leave D46 from the position after 6.Bd3, each with its own moves.

CodeMovesReference line
D476...dxc4 7.Bxc4Semi-Slav Defense: Semi-Meran Variation

Closest boards in other codes

CodeLineDiffers on
D52Queen’s Gambit Declinedfour squares: c1, f1, d3, g5
D42Queen’s Gambit Declined: Semi-Tarrasch Defense, Main Linesix squares: c4, c5, d5, c6, f6, d7
D43Semi-Slav Defensesix squares: f1, e2, d3, e3, d7, b8
D48Semi-Slav Defense: Meran Variationsix squares: c4, b5, d5, a6, a7, b7
B14Caro-Kann Defense: Panov Attackeight squares: f1, g1, d3, e3, f3, c6, d7, b8
D15Slav Defense: Three Knights Variationeight squares: f1, e2, d3, e3, e6, d7, e7, b8
D37Queen’s Gambit Declined: Three Knights Variationeight squares: f1, e2, d3, e3, c6, c7, d7, b8

Where lines continue from here

Seventeen named lines filed under other codes pass through the position after 6.Bd3. Besides the codes above, they belong to D48, D49.

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
  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

  • Semi-Slav Defense: Main Line is also reached inside D47 Semi-Slav Defense: Meran Variation, Lundin Variation, whose order is 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Bd3.
  • Semi-Slav Defense: Main Line is also reached inside D48 Semi-Slav Defense: Meran Variation, Pirc Variation, whose order is 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e3 Nf6 5.Nf3 Nbd7 6.Bd3.
  • Semi-Slav Defense: Main Line is also reached inside D49 Semi-Slav Defense: Meran Variation, Rellstab Attack, whose order is 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.Nf3 e6 5.e3 Nbd7 6.Bd3.

Open this line in the finderAll Semi-Slav Defense codes