ecocodes
Volume D · Closed and semi-closed games‹ D42D44 ›
a1b2c3d4e5f6g7h8
Reference position · White to move

D43 Semi-Slav Defense

D43 holds four named lines, all under the name Semi-Slav Defense. It leaves D15 (Slav Defense: Three Knights Variation) with 4...e6. Lines of six other codes continue from its position, the widest spread of the 7 Semi-Slav Defense codes. At eight plies, its reference line is the shortest of the 7 Semi-Slav Defense codes. White’s pieces and pawns attack six squares in Black’s half, the second-lowest count of the 7 Semi-Slav Defense codes.

Score sheet
#WhiteBlack
1d4d5
2c4c6
3Nf3Nf6
4Nc3e6

The move that completes D43

The reference line of D44 plays all of these moves and continues beyond them; D43 is the position reached at 4...e6.

  1. 4...e6 The e-pawn advances to e6, covering d5 and f5, opening a line for the queen on d8 and the bishop on f8.

Lines filed under D43

All four share their first eight plies, the whole reference line.

NameAfter the shared startPlies
Semi-Slav Defense(the shared start itself)8
Semi-Slav Defense: Anti-Moscow Gambit5.Bg5 h6 6.Bh411
Semi-Slav Defense: Moscow Variation5.Bg5 h6 6.Bxf6 Qxf612
Semi-Slav Defense: Hastings Variation5.Bg5 h6 6.Bxf6 Qxf6 7.Qb313

Semi-Slav Defense: Anti-Moscow Gambit

  1. 5.Bg5 The bishop leaves c1 for g5, opening a line for the rook on a1 and the queen on d1, attacking the knight on f6.
  2. 5...h6 The h-pawn advances to h6, covering g5, opening a line for the rook on h8, attacking the bishop on g5.
  3. 6.Bh4 The bishop goes from g5 to h4, attacking the knight on f6.

Semi-Slav Defense: Moscow Variation

  1. 5.Bg5 The bishop leaves c1 for g5, opening a line for the rook on a1 and the queen on d1, attacking the knight on f6.
  2. 5...h6 The h-pawn advances to h6, covering g5, opening a line for the rook on h8, attacking the bishop on g5.
  3. 6.Bxf6 The bishop on g5 takes the knight on f6, attacking the queen on d8.
  4. 6...Qxf6 The queen on d8 takes the bishop on f6, attacking the knight on f3.

Semi-Slav Defense: Hastings Variation

  1. 5.Bg5 The bishop leaves c1 for g5, opening a line for the rook on a1 and the queen on d1, attacking the knight on f6.
  2. 5...h6 The h-pawn advances to h6, covering g5, opening a line for the rook on h8, attacking the bishop on g5.
  3. 6.Bxf6 The bishop on g5 takes the knight on f6, attacking the queen on d8.
  4. 6...Qxf6 The queen on d8 takes the bishop on f6, attacking the knight on f3.
  5. 7.Qb3 The queen goes from d1 to b3, opening a line for the rook on a1, guarding the pawn on b2 and the pawn on c4.

The road to D43

  1. 1.d4 … 2...c6four earlier stops: A40, D00, D06, D10
  2. 3.Nf3D11 Modern Line
  3. 4.Nc3D15 Three Knights Variation
  4. 4...e6D43

The position after 4...e6

White has brought out the knight on c3 and knight on f3; Black the knight on f6. White could capture with Nxd5, cxd5. White is to move and has 35 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed21Moves spent on pawns23Pawns on d4, e4, d5, e511Squares attacked in the other half65not castlednot castled

Codes that branch off from D43

The reference lines of two other codes leave D43 from the position after 4...e6, each with its own moves.

CodeMovesReference line
D445.Bg5 dxc4Semi-Slav Defense Accepted
D525.Bg5 Nbd7 6.e3Queen’s Gambit Declined

Closest boards in other codes

CodeLineDiffers on
D37Queen’s Gambit Declined: Three Knights Variationtwo squares: c6, c7
D40Queen’s Gambit Declined: Semi-Tarrasch Defensetwo squares: c5, c6
D45Semi-Slav Defense: Main Linetwo squares: e2, e3
B14Caro-Kann Defense: Panov Attackfour squares: g1, e2, f3, c6
D35Queen’s Gambit Declined: Normal Defensefour squares: g1, f3, c6, c7
D38Queen’s Gambit Declined: Ragozin Defensefour squares: b4, c6, c7, f8
D41Queen’s Gambit Declined: Semi-Tarrasch Defensefour squares: c4, c5, d5, c6

Where lines continue from here

Besides the codes above, they belong to D45, D47, 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 is also reached inside D44 Semi-Slav Defense: Botvinnik Variation, Alatortsev System, whose order is 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c6.
  • Semi-Slav Defense is also reached inside D45 Semi-Slav Defense: Normal Variation, whose order is 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 Nf6.
  • Semi-Slav Defense 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.

Open this line in the finderAll Semi-Slav Defense codes