ecocodes
Volume A · Flank openings‹ A20A22 ›
a1b2c3d4e5f6g7h8
Reference position · Black to move

A21 English Opening: King’s English Variation, Reversed Sicilian

A21 holds six named lines, all under the name English Opening. It leaves A20 (English Opening: King’s English Variation) with 2.Nc3. Lines of eight other codes continue from its position, the fifth-widest spread of the 29 English Opening codes. None of its six lines contains a capture.

Score sheet
#WhiteBlack
1c4e5
2Nc3

The move that completes A21

The reference line of A22 plays all of these moves and continues beyond them; A21 is the position reached at 2.Nc3.

  1. 2.Nc3 The knight leaves b1 for c3, opening a line for the rook on a1.

Lines filed under A21

All six share their first three plies, the whole reference line and then split three ways at Black’s move 2.

NameAfter the shared startPlies
English Opening: King’s English Variation, Reversed Sicilian(the shared start itself)3
English Opening: King’s English Variation, Kramnik-Shirov Counterattack2...Bb44
English Opening: King’s English Variation2...d6 3.Nf35
English Opening: King’s English Variation, Keres Defense2...d6 3.g3 c66
English Opening: King’s English Variation, Smyslov Defense2...d6 3.Nf3 Bg46
English Opening: King’s English Variation, Troger Defense2...Nc6 3.g3 d6 4.Bg2 Be68

The road to A21

  1. 1.c4A10 English Opening
  2. 1...e5A20 King’s English Variation
  3. 2.Nc3A21

The position after 2.Nc3

White has brought out the knight on c3; Black has not yet moved a knight or bishop. Black is to move and has 30 legal moves.

WhiteBlackMaterial (pawn units)3939Minor pieces developed10Moves spent on pawns11Pawns on d4, e4, d5, e501Squares attacked in the other half25not castlednot castled

Codes that branch off from A21

The reference lines of two other codes leave A21 from the position after 2.Nc3, each with its own moves.

CodeMovesReference line
A222...Nf6English Opening: King’s English Variation, Two Knights Variation
A252...Nc6English Opening: King’s English Variation, Reversed Closed Sicilian

Closest boards in other codes

CodeLineDiffers on
A00Van Geet Openingfour squares: c2, c4, e5, e7
A10English Openingfour squares: b1, c3, e5, e7
A13English Opening: Agincourt Defensefour squares: b1, c3, e5, e6
A16English Opening: Anglo-Indian Defense, Queen’s Knight Variationfour squares: e5, f6, e7, g8
A17English Opening: Anglo-Indian Defense, Hedgehog Systemfour squares: e5, e6, f6, g8
A27English Opening: King’s English Variation, Three Knights Systemfour squares: g1, f3, c6, b8
A34English Opening: Symmetrical Variation, Normal Variationfour squares: c5, e5, c7, e7

Where lines continue from here

Besides the codes above, they belong to A23, A24, A26, A27, A28, A29.

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
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  38. 37
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  40. 39
  41. 40
  42. 41
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  44. 43
  45. 44
  46. 45
  47. 46
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  50. 49
  51. 50
  52. 51
  53. 52
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  66. 65
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  71. 70
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  73. 72
  74. 73
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  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 English Opening codes