ecocodes
Volume D · Closed and semi-closed games‹ D03D05 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

D04 Queen’s Pawn Game: Colle System

D04 holds three named lines, all under the name Queen’s Pawn Game. It leaves D02 (Queen’s Pawn Game: Symmetrical Variation) with 3.e3. Black, to move in that position, has 29 legal moves, the second-highest count of the 7 Queen’s Pawn Game codes. At five plies, its reference line is the second-longest of the 7 Queen’s Pawn Game codes. At five plies, its reference line is the fifth-shortest of the 7 Queen’s Pawn Game codes.

Score sheet
#WhiteBlack
1d4d5
2Nf3Nf6
3e3

The move that completes D04

The reference line of D05 plays all of these moves and continues beyond them; D04 is the position reached at 3.e3.

  1. 3.e3 The e-pawn advances to e3, covering d4 and f4, opening a line for the queen on d1 and the bishop on f1.

Lines filed under D04

All three share their first five plies, the whole reference line and then split two ways at Black’s move 3.

NameAfter the shared startPlies
Queen’s Pawn Game: Colle System(the shared start itself)5
Queen’s Pawn Game: Colle System, Anti-Colle3...Bf56
Queen’s Pawn Game: Colle System, Grünfeld Formation3...g6 4.Bd3 Bg78

Queen’s Pawn Game: Colle System, Anti-Colle

  1. 3...Bf5 The bishop leaves c8 for f5, opening a line for the queen on d8.

Queen’s Pawn Game: Colle System, Grünfeld Formation

  1. 3...g6 The g-pawn advances to g6, covering f5 and h5, opening a line for the bishop on f8.
  2. 4.Bd3 The bishop leaves f1 for d3, opening a line for the rook on h1.
  3. 4...Bg7 The bishop leaves f8 for g7, opening a line for the rook on h8, guarding the rook on h8.

The road to D04

  1. 1.d4 … 1...d5two earlier stops: A40, D00
  2. 2.Nf3D02 Zukertort Variation
  3. 2...Nf6D02 Symmetrical Variation
  4. 3.e3D04

The position after 3.e3

White has brought out the knight on f3; Black the knight on f6.

WhiteBlackMaterial (pawn units)3939Minor pieces developed11Moves spent on pawns21Pawns on d4, e4, d5, e511Squares attacked in the other half54not castlednot castled

Codes that branch off from D04

The reference lines of one other code leave D04 from the position after 3.e3, each with its own moves.

CodeMovesReference line
D053...e6Queen’s Pawn Game: Colle System

Closest boards in other codes

CodeLineDiffers on
D25Queen’s Gambit Accepted: Normal Variationthree squares: c2, c4, d5
A46Indian Defense: Knights Variationfour squares: e2, e3, d5, d7
D03Queen’s Pawn Game: Torre Attackfour squares: c1, e2, e3, g5
D13Slav Defense: Exchange Variationfour squares: c2, e2, e3, c7
B04Alekhine Defense: Modern Variationfive squares: e3, d5, e5, d6, f6
D23Queen’s Gambit Acceptedfive squares: c2, e2, e3, c4, d5
D26Queen’s Gambit Accepted: Normal Variation, Traditional Systemfive squares: c2, c4, d5, e6, e7

Where lines continue from here

Nine named lines filed under other codes pass through the position after 3.e3. All of them belong to the codes listed above.

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

Open this line in the finderAll Queen’s Pawn Game codes