ecocodes
Volume A · Flank openings‹ A03A05 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

A04 Zukertort Opening

Also filed here: Modern Defense, Zukertort Defense, Colle System.

A04 holds 31 named lines from four openings, most of them (25) under Zukertort Opening. Its reference line is a single first move, played from the initial position. Material is no longer level at the end of four of its lines; the widest gap, one pawn in White’s favour, comes in Colle System: Rhamphorhynchus Variation. With 31 named lines it is the fourth-largest code of the 100 codes in volume A.

Score sheet
#WhiteBlack
1Nf3

What each move does

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

Lines filed under A04

All 31 share their first one ply, the whole reference line and then split 17 ways at Black’s move 1.

NameAfter the shared startPliesAt the end
Zukertort Opening(the shared start itself)1
Zukertort Opening: Arctic Defense1...f62
Zukertort Opening: Basman Defense1...h62
Zukertort Opening: Black Mustang Defense1...Nc62
Zukertort Opening: Dutch Variation1...f52
Zukertort Opening: Herrstrom Gambit1...g52
Zukertort Opening: Kingside Fianchetto1...g62
Zukertort Opening: Pirc Invitation1...d62
Zukertort Opening: Polish Defense1...b52
Zukertort Opening: Queen’s Gambit Invitation1...e62
Zukertort Opening: Queenside Fianchetto Variation1...b62
Zukertort Opening: Ross Gambit1...e52
Zukertort Opening: Sicilian Invitation1...c52
Zukertort Opening: Slav Invitation1...c62
Zukertort Opening: St. George Defense1...a62
Zukertort Opening: Ware Defense1...a52
Zukertort Opening: Lisitsyn Gambit1...f5 2.e43
Zukertort Defense: Kingside Variation1...Nh6 2.d4 g64
Zukertort Defense: Sicilian Knight Variation1...Na6 2.e4 c54
Zukertort Opening: Drunken Cavalry Variation1...Na6 2.e4 Nh64
Zukertort Opening: Vos Gambit1...d6 2.d4 e54
Zukertort Opening: Wade Defense1...d6 2.e4 Bg44
Zukertort Opening: Lisitsyn Gambit Deferred1...f5 2.d3 Nf6 3.e45
Zukertort Opening: Speelsmet Gambit1...c5 2.d4 cxd4 3.e35Black +1
Zukertort Opening: Arctic Defense, Drunken Knight Variation1...f6 2.e4 Nh6 3.d4 Nf76
Zukertort Opening: The Walrus1...e5 2.Nxe5 Nc6 3.Nxc6 dxc66White +1
Colle System: Rhamphorhynchus Variation1...c5 2.e3 g6 3.d4 Bg7 4.dxc5 Qa5+8White +1, check
Modern Defense: Semi-Averbakh Variation, Polish Variation1...c5 2.c4 g6 3.d4 Bg7 4.e4 Qb68
Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation1...c5 2.c4 g6 3.d4 Bg7 4.e4 Qa5+8check
Zukertort Opening: Shabalov Gambit1...e6 2.c4 a6 3.Nc3 c5 4.g3 b58
Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Accepted1...g6 2.d4 Bg7 3.e4 d6 4.c4 c5 5.dxc5 Qa5+10White +1, check

The position after 1.Nf3

White has brought out the knight on f3; Black has not yet moved a knight or bishop. Black is to move and has 20 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed10Moves spent on pawns00Pawns on d4, e4, d5, e500Squares attacked in the other half20not castlednot castled

Codes that branch off from A04

The reference lines of two other codes leave A04 from the position after 1.Nf3, each with its own moves.

CodeMovesReference line
A051...Nf6Zukertort Opening
A061...d5Zukertort Opening

Closest boards in other codes

CodeLineDiffers on
A00Van Geet Openingfour squares: b1, g1, c3, f3
A01Nimzo-Larsen Attackfour squares: g1, b2, b3, f3
A02Bird Openingfour squares: g1, f2, f3, f4
A07King’s Indian Attackfour squares: g2, g3, d5, d7
A09Réti Openingfour squares: c2, c4, d5, d7
A10English Openingfour squares: g1, c2, f3, c4
A40Queen’s Pawn Gamefour squares: g1, d2, f3, d4

Where lines continue from here

Seventy-eight named lines filed under other codes pass through the position after 1.Nf3. Besides the codes above, they belong to A07, A08, A09, A11, A12, A14, A42, D02, D45, D63, D64, E14.

Volume A

  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

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
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  80. 79
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  83. 82
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  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

Volume E

  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 Zukertort Opening codes