ecocodes
Volume A · Flank openings‹ A29A31 ›
a1b2c3d4e5f6g7h8
Reference position · White to move

A30 English Opening: Symmetrical Variation

A30 holds six named lines, all under the name English Opening. It leaves A10 (English Opening) with 1...c5. Its deepest line, English Opening: Symmetrical, Hedgehog, Flexible Formation, runs to 10...Nbd7, the longest of the 29 English Opening codes. White, to move in that position, has 21 legal moves, the second-lowest count of the 29 English Opening codes. Lines filed under A04 reach one of its named positions by a different move order.

Score sheet
#WhiteBlack
1c4c5

The move that completes A30

The reference line of A34 plays all of these moves and continues beyond them; A30 is the position reached at 1...c5.

  1. 1...c5 The c-pawn advances two squares to c5, covering b4 and d4, opening a line for the queen on d8.

Lines filed under A30

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

NameAfter the shared startPliesAt the end
English Opening: Symmetrical Variation1...c52
English Opening: Symmetrical Variation1...c5 2.Nf33
English Opening: Wing Gambit1...c5 2.b43
English Opening: Symmetrical Variation, Napolitano Gambit1...c5 2.Nf3 Nf6 3.b45
English Opening: Symmetrical Variation, Hedgehog Defense1...e6 2.Nf3 Nf6 3.Nc3 c5 4.g3 b6 5.Bg2 Bb7 6.O-O Be712White castled
English Opening: Symmetrical, Hedgehog, Flexible Formation1...e6 2.Nf3 c5 3.Nc3 Nf6 4.g3 b6 5.Bg2 Bb7 6.O-O Be7 7.d4 cxd4 8.Qxd4 d6 9.Rd1 a6 10.b3 Nbd720White castled

The road to A30

  1. 1.c4A10 English Opening
  2. 1...c5A30

The position after 1...c5

WhiteBlackMaterial (pawn units)3939Minor pieces developed00Moves spent on pawns11Pawns on d4, e4, d5, e500Squares attacked in the other half22not castlednot castled

Codes that branch off from A30

The reference lines of one other code leave A30 from the position after 1...c5, each with its own moves.

CodeMovesReference line
A342.Nc3English Opening: Symmetrical Variation, Normal Variation

Closest boards in other codes

CodeLineDiffers on
A11English Opening: Caro-Kann Defensive Systemtwo squares: c5, c6
A13English Opening: Agincourt Defensefour squares: c5, e6, c7, e7
A15English Opening: Anglo-Indian Defensefour squares: c5, f6, c7, g8
A20English Opening: King’s English Variationfour squares: c5, e5, c7, e7
A35English Opening: Symmetrical Variation, Two Knights Variationfour squares: b1, c3, c6, b8
A43Benoni Defense: Old Benonifour squares: c2, d2, c4, d4
A56Benoni Defensefour squares: d2, d4, f6, g8

Where lines continue from here

Twenty-four named lines filed under other codes pass through the position after 1...c5. Besides the codes above, they belong to A35, A36, A37, A38, D32, D41.

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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  35. 34
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  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
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  18. 17
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  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
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  50. 49
  51. 50
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  53. 52
  54. 53
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  96. 95
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  98. 97
  99. 98
  100. 99

Other move orders

  • English Opening: Symmetrical Variation is also reached inside A04 Modern Defense: Semi-Averbakh Variation, Polish Variation, whose order is 1.Nf3 c5 2.c4.

Open this line in the finderAll English Opening codes