ecocodes
Volume D · Closed and semi-closed games‹ D44D46 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

D45 Semi-Slav Defense: Main Line

D45 holds 15 named lines, all under the name Semi-Slav Defense. It leaves D10 (Slav Defense) with 3...Nf6 4.e3 e6 5.Nf3. With 15 named lines it is the largest code of the 7 Semi-Slav Defense codes. White’s pieces and pawns attack five squares in Black’s half, the fewest of the 7 Semi-Slav Defense codes. Lines of four other codes continue from its position, the second-widest spread of the 7 Semi-Slav Defense codes.

Score sheet
#WhiteBlack
1d4d5
2c4c6
3Nc3Nf6
4e3e6
5Nf3

The move that completes D45

The reference line of D46 plays all of these moves and continues beyond them; D45 is the position reached at 5.Nf3.

  1. 5.Nf3 The knight leaves g1 for f3, opening a line for the rook on h1.

Lines filed under D45

They begin with two different first moves.

NameAfter the shared startPliesAt the end
Semi-Slav Defense: Main Line1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf39
Semi-Slav Defense: Accelerated Meran Variation1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 a610
Semi-Slav Defense: Normal Variation1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd710
Semi-Slav Defense: Rubinstein System1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 Nf6 5.e3 Nbd7 6.Ne511
Semi-Slav Defense: Stoltz Variation1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc211
Semi-Slav Defense: Stonewall Defense1.d4 d5 2.Nf3 Nf6 3.c4 c6 4.Nc3 e6 5.e3 Ne4 6.Bd3 f512
Semi-Slav Defense: Stoltz Variation1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc2 b6 7.b313
Semi-Slav Defense: Stoltz Variation1.d4 d5 2.Nf3 Nf6 3.c4 c6 4.e3 e6 5.Nc3 Nbd7 6.Qc2 Bd6 7.b313
Semi-Slav Defense: Stoltz Variation, Center Variation1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Qc2 Bd6 7.e413
Semi-Slav Defense: Stoltz Variation, Shabalov Attack1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Qc2 Bd6 7.g413
Semi-Slav Defense: Normal Variation1.Nf3 d5 2.e3 Nf6 3.c4 c6 4.Nc3 e6 5.b3 Bd6 6.Bb2 O-O 7.d4 Nbd714Black castled
Semi-Slav Defense: Stoltz Variation1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc2 b6 7.b3 Bb714
Semi-Slav Defense: Normal Variation1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 Nf6 5.e3 Nbd7 6.b3 Bd6 7.Bb2 O-O 8.Be215Black castled
Semi-Slav Defense: Stoltz Variation1.d4 d5 2.Nf3 Nf6 3.c4 c6 4.e3 e6 5.Nc3 Nbd7 6.Qc2 Bd6 7.b3 O-O 8.Bb215Black castled
Semi-Slav Defense: Stoltz Variation, Center Variation, Mikhalchishin Line1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nbd7 6.Qc2 Bd6 7.e4 dxe4 8.Nxe4 Nxe4 9.Qxe4 e5 10.dxe519White +1

The road to D45

  1. 1.d4 … 2.c4three earlier stops: A40, D00, D06
  2. 2...c6D10 Slav Defense
  3. 3.Nc3D10 Slav Defense
  4. 5.Nf3D45

The position after 5.Nf3

White has brought out the knight on c3 and knight on f3; Black the knight on f6. Black could capture with dxc4. Black is to move and has 33 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed21Moves spent on pawns33Pawns on d4, e4, d5, e511Squares attacked in the other half55not castlednot castled

Codes that branch off from D45

The reference lines of one other code leave D45 from the position after 5...Nbd7, each with its own moves.

CodeMovesReference line
D466.Bd3Semi-Slav Defense: Main Line

Closest boards in other codes

CodeLineDiffers on
D43Semi-Slav Defensetwo squares: e2, e3
B14Caro-Kann Defense: Panov Attackfour squares: g1, e3, f3, c6
D15Slav Defense: Three Knights Variationfour squares: e2, e3, e6, e7
D37Queen’s Gambit Declined: Three Knights Variationfour squares: e2, e3, c6, c7
D40Queen’s Gambit Declined: Semi-Tarrasch Defensefour squares: e2, e3, c5, c6
D52Queen’s Gambit Declinedfour squares: c1, g5, d7, b8
D47Semi-Slav Defense: Semi-Meran Variationfive squares: f1, c4, d5, d7, b8

Where lines continue from here

Besides the codes above, they belong to 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: Accelerated Meran Variation is also reached inside D48 Semi-Slav Defense: Meran Variation, whose order is 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e3 Nf6 5.Nf3 a6.
  • Semi-Slav Defense: Main Line is also reached inside D46 Semi-Slav Defense: Chigorin Defense, whose order is 1.d4 d5 2.c4 c6 3.Nf3 e6 4.e3 Nf6 5.Nc3.
  • Semi-Slav Defense: Main Line is also reached inside D48 Semi-Slav Defense: Meran Variation, whose order is 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e3 Nf6 5.Nf3.
  • 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.
  • Semi-Slav Defense: Normal Variation 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.
  • Semi-Slav Defense: Normal Variation 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.
  • Semi-Slav Defense: Normal Variation is also reached inside D46 Semi-Slav Defense: Chigorin Defense, whose order is 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.b3 Bd6 7.Bb2 O-O.
  • Semi-Slav Defense: Stoltz Variation is also reached inside D46 Semi-Slav Defense: Chigorin Defense, whose order is 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc2 Bd6 7.b3.
  • Semi-Slav Defense: Stoltz Variation is also reached inside D46 Semi-Slav Defense: Chigorin Defense, whose order is 1.d4 d5 2.c4 c6 3.Nc3 Nf6 4.e3 e6 5.Nf3 Nbd7 6.Qc2 Bd6 7.b3 O-O 8.Bb2.

Open this line in the finderAll Semi-Slav Defense codes