ecocodes
Volume A · Flank openings‹ A90A92 ›
a1b2c3d4e5f6g7h8
Reference position · White to move

A91 Dutch Defense: Classical Variation

A91 holds two named lines, all under the name Dutch Defense. It leaves A90, a position of the same name, with 4...Be7. Lines of eight other codes continue from its position, the fifth-widest spread of the 20 Dutch Defense codes. That final move, by the bishop, opens a line for the rook on h8.

Score sheet
#WhiteBlack
1d4f5
2c4Nf6
3g3e6
4Bg2Be7

Lines filed under A91

Both share their first eight plies, the whole reference line.

NameAfter the shared startPlies
Dutch Defense: Classical Variation(the shared start itself)8
Dutch Defense: Classical Variation, Blackburne Attack5.Nh39

Dutch Defense: Classical Variation, Blackburne Attack

  1. 5.Nh3 The knight leaves g1 for h3, opening a line for the rook on h1.

The road to A91

  1. 1.d4 … 2...Nf6four earlier stops: A40, A80, A84
  2. 3.g3A86 Fianchetto Variation
  3. 4.Bg2A90 Classical Variation
  4. 4...Be7A91

The position after 4...Be7

White has brought out the bishop on g2; Black the knight on f6 and bishop on e7. White could capture with Bxb7. White is to move and has 37 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed12Moves spent on pawns32Pawns on d4, e4, d5, e510Squares attacked in the other half84not castlednot castled

Codes that branch off from A91

The reference lines of one other code leave A91 from the position after 4...Be7, each with its own moves.

CodeMovesReference line
A925.Nf3 O-ODutch Defense: Classical Variation

Closest boards in other codes

CodeLineDiffers on
A86Dutch Defense: Fianchetto Variationfive squares: f1, g2, e6, e7, f8
A87Dutch Defense: Leningrad Variationsix squares: g1, f3, e6, g6, e7, g7
E00Catalan Openingsix squares: f1, g2, f5, e7, f7, f8
E01Catalan Opening: Open Defensesix squares: d5, f5, d7, e7, f7, f8
E02Catalan Opening: Open Defensesix squares: c4, f5, d7, e7, f7, f8
E05Catalan Opening: Open Defense, Classical Linesix squares: g1, f3, c4, f5, d7, f7
E06Catalan Opening: Closedsix squares: g1, f3, d5, f5, d7, f7

Where lines continue from here

Besides the codes above, they belong to A93, A94, A95, A96, A97, A98, A99.

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
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  32. 31
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  44. 43
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  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 Dutch Defense codes