ecocodes
Volume D · Closed and semi-closed games‹ D50D52 ›
a1b2c3d4e5f6g7h8
Reference position · White to move

D51 Queen’s Gambit Declined: Modern Variation, Knight Defense

D51 holds seven named lines, all under the name Queen’s Gambit. It leaves D50 (Queen’s Gambit Declined: Modern Variation) with 4...Nbd7. None of its seven lines contains a capture. That final move, by the knight, opens a line for the rook on a8.

Score sheet
#WhiteBlack
1d4d5
2c4e6
3Nc3Nf6
4Bg5Nbd7

Lines filed under D51

All seven share their first eight plies, the whole reference line and then split two ways at White’s move 5.

NameAfter the shared startPlies
Queen’s Gambit Declined: Modern Variation, Knight Defense(the shared start itself)8
Queen’s Gambit Declined: Modern Variation, Knight Defense5.e39
Queen’s Gambit Declined: Manhattan Variation5.e3 Bb410
Queen’s Gambit Declined: Modern Variation, Knight Defense5.e3 c610
Queen’s Gambit Declined: Alekhine Variation5.Nf3 c6 6.e411
Queen’s Gambit Declined: Capablanca Variation, Anti-Cambridge Springs Variation5.e3 c6 6.a311
Queen’s Gambit Declined: Rochlin Variation5.Nf3 c6 6.Rc1 Qa5 7.Bd213

The road to D51

  1. 1.d4 … 3.Nc3five earlier stops: A40, D00, D06, D30, D31
  2. 3...Nf6D35 Normal Defense
  3. 4.Bg5D50 Modern Variation
  4. 4...Nbd7D51

The position after 4...Nbd7

White has brought out the knight on c3 and bishop on g5; Black the knight on d7 and knight on f6. White could capture with Bxf6, Nxd5, cxd5. White is to move and has 38 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed22Moves spent on pawns22Pawns on d4, e4, d5, e511Squares attacked in the other half65not castlednot castled

Closest boards in other codes

CodeLineDiffers on
D35Queen’s Gambit Declined: Normal Defensefour squares: c1, g5, d7, b8
D53Queen’s Gambit Declinedfour squares: d7, e7, b8, f8
E30Nimzo-Indian Defense: Leningrad Variationfive squares: b4, d5, d7, b8, f8
B14Caro-Kann Defense: Panov Attacksix squares: c1, e2, g5, c7, d7, b8
C12French Defense, Classical, 4. Bg5six squares: c2, e2, c4, e4, d7, b8
D01Richter-Veresov Attacksix squares: c2, c4, e6, d7, e7, b8
D31Queen’s Gambit Declined: Queen’s Knight Variationsix squares: c1, g5, f6, d7, b8, g8

Where lines continue from here

Two named lines filed under other codes pass through the position after 4...Nbd7. They belong to D52.

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

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