The Symmetrical, Hedgehog, Flexible Formation is a variation of the English Opening, catalogued as ECO A30. The line runs 1. c4 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 Nbd7, reaching the position shown below after 20 half-moves.
The four central squares are empty of pawns, so the fight for them is being conducted by pieces. Development is level at three minor pieces each. It is White to move after ten moves. White has castled while Black’s king is still uncommitted.
On the English Opening generally: A flexible opening where White controls the center with c4. Can transpose into many different systems.
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The Symmetrical, Hedgehog, Flexible Formation goes 1. c4 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 Nbd7. It is a variation of the English Opening and is catalogued as ECO A30.
The Symmetrical, Hedgehog, Flexible Formation is ECO A30. ECO codes group openings by their move order, so nearby codes cover closely related lines of the English Opening.
Stockfish evaluates the position after 1. c4 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 Nbd7 at +0.47 at depth 18, which is a slight pull for White, within normal opening margins. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
The four central squares are empty of pawns, so the fight for them is being conducted by pieces. Development is level at three minor pieces each. It is White to move. White has castled while Black’s king is still uncommitted.