ecocodes
Volume A · Flank openings‹ A16A18 ›
a1b2c3d4e5f6g7h8
Reference position · White to move

A17 English Opening: Anglo-Indian Defense, Hedgehog System

A17 holds six named lines, all under the name English Opening. It leaves A16 (English Opening: Anglo-Indian Defense, Queen’s Knight Variation) with 2...e6. That final move, by the e-pawn, covers d5 and f5 and opens a line for the queen on d8 and the bishop on f8. Of all other reference positions, the board of A18 (Mikenas-Carls Variation) comes closest, two squares apart.

Score sheet
#WhiteBlack
1c4Nf6
2Nc3e6

Lines filed under A17

All six share the start 1.c4 and then split two ways at Black’s move 1.

NameAfter the shared startPlies
English Opening: Anglo-Indian Defense, Hedgehog System1...Nf6 2.Nc3 e64
English Opening: Anglo-Indian Defense, Nimzo-English1...Nf6 2.Nc3 e6 3.Nf3 Bb46
English Opening: Anglo-Indian Defense, Queen’s Indian Formation1...e6 2.Nc3 Nf6 3.Nf3 b66
English Opening: Anglo-Indian Defense, Zvjaginsev-Krasenkow Attack1...e6 2.Nc3 Nf6 3.Nf3 Bb4 4.g47
English Opening: Anglo-Indian Defense, Queen’s Indian Variation1...e6 2.Nc3 Nf6 3.Nf3 b6 4.e4 Bb7 5.Bd39
English Opening: Anglo-Indian Defense1...Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 c5 5.e3 e610

The road to A17

  1. 1.c4one earlier stop: A10
  2. 1...Nf6A15 Anglo-Indian Defense
  3. 2.Nc3A16 Queen’s Knight Variation
  4. 2...e6A17

The position after 2...e6

White has brought out the knight on c3; Black the knight on f6. White is to move and has 26 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed11Moves spent on pawns11Pawns on d4, e4, d5, e500Squares attacked in the other half24not castlednot castled

Codes that branch off from A17

The reference lines of one other code leave A17 from the position after 2...e6, each with its own moves.

CodeMovesReference line
A183.e4English Opening: Mikenas-Carls Variation

Closest boards in other codes

CodeLineDiffers on
A22English Opening: King’s English Variation, Two Knights Variationtwo squares: e5, e6
A13English Opening: Agincourt Defensefour squares: b1, c3, f6, g8
A15English Opening: Anglo-Indian Defensefour squares: b1, c3, e6, e7
A19English Opening: Mikenas-Carls, Sicilianfour squares: e2, e4, c5, c7
A21English Opening: King’s English Variation, Reversed Sicilianfour squares: e5, e6, f6, g8
D35Queen’s Gambit Declined: Normal Defensefour squares: d2, d4, d5, d7
E20Nimzo-Indian Defensefour squares: d2, b4, d4, f8

Where lines continue from here

Five named lines filed under other codes pass through the position after 2...e6. Besides the codes above, they belong to A19.

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
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  25. 24
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  95. 94
  96. 95
  97. 96
  98. 97
  99. 98
  100. 99

Open this line in the finderAll English Opening codes