ecocodes
Volume D · Closed and semi-closed games‹ D39D41 ›
a1b2c3d4e5f6g7h8
Reference position · White to move

D40 Queen’s Gambit Declined: Semi-Tarrasch Defense

D40 holds six named lines, all under the name Queen’s Gambit. It leaves D37 (Queen’s Gambit Declined: Three Knights Variation) with 4...c5. Lines filed under D34 and D50 reach one of its named positions by a different move order. That final move, by the c-pawn, covers b4 and d4 and opens a line for the queen on d8.

Score sheet
#WhiteBlack
1d4Nf6
2c4e6
3Nf3d5
4Nc3c5

Lines filed under D40

All six share the start 1.d4 and then split two ways at Black’s move 1.

NameAfter the shared startPliesAt the end
Queen’s Gambit Declined: Semi-Tarrasch Defense1...Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c58
Queen’s Gambit Declined: Semi-Tarrasch Defense, Pillsbury Variation1...d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.Bg59
Queen’s Gambit Declined: Semi-Tarrasch Defense, with e31...d5 2.c4 c5 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nc6 6.Bd311
Queen’s Gambit Declined: Semi-Tarrasch Defense1...d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.e3 Nc6 6.a3 cxd4 7.exd4 Bd614
Queen’s Gambit Declined: Semi-Tarrasch Defense, Symmetrical Variation1...d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.e3 Nc6 6.Bd3 Bd6 7.O-O O-O14both castled
Queen’s Gambit Declined: Semi-Tarrasch Defense, Levenfish Variation1...d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.e3 Nc6 6.Bd3 Bd6 7.O-O O-O 8.Qe2 Qe7 9.dxc5 Bxc5 10.e419both castled

The road to D40

  1. 1.d4 … 2...e6three earlier stops: A40, A45, A50
  2. 3.Nf3E10 Anti-Nimzo-Indian
  3. 4.Nc3D37 Three Knights Variation
  4. 4...c5D40

The position after 4...c5

White has brought out the knight on c3 and knight on f3; Black the knight on f6. White could capture with Nxd5, cxd5, dxc5. 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 D40

The reference lines of one other code leave D40 from the position after 4...c5, each with its own moves.

CodeMovesReference line
D415.cxd5Queen’s Gambit Declined: Semi-Tarrasch Defense

Closest boards in other codes

CodeLineDiffers on
D43Semi-Slav Defensetwo squares: c5, c6
B14Caro-Kann Defense: Panov Attackfour squares: g1, e2, f3, c5
D15Slav Defense: Three Knights Variationfour squares: c5, c6, e6, e7
D32Tarrasch Defensefour squares: g1, f3, f6, g8
D35Queen’s Gambit Declined: Normal Defensefour squares: g1, f3, c5, c7
D38Queen’s Gambit Declined: Ragozin Defensefour squares: b4, c5, c7, f8
D45Semi-Slav Defense: Main Linefour squares: e2, e3, c5, c6

Where lines continue from here

Ten named lines filed under other codes pass through the position after 4...c5. Besides the codes above, they belong to D34, D42.

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

  • Queen’s Gambit Declined: Semi-Tarrasch Defense is also reached inside D34 Tarrasch Defense: Classical Variation, Bogoljubow Variation, whose order is 1.d4 Nf6 2.c4 e6 3.Nc3 c5 4.Nf3 d5.
  • Queen’s Gambit Declined: Semi-Tarrasch Defense, Pillsbury Variation is also reached inside D50 Queen’s Gambit Declined: Pseudo-Tarrasch Variation, Primitive Pillsbury Variation, whose order is 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.Nf3.

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