The Stonewall Variation is a variation of the Dutch Defense, catalogued as ECO A95. The line runs 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. Nc3 c6, reaching the position shown below after 14 half-moves.
Both sides have pawns in the centre (White on d4, Black on d5), and one pawn capture is available, so the structure has not settled yet. Development is level at three minor pieces each. It is White to move after seven moves. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.
On the Dutch Defense generally: An aggressive response to 1.d4 where Black immediately fights for control of the e4 square.
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The Stonewall Variation goes 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. Nc3 c6. It is a variation of the Dutch Defense and is catalogued as ECO A95.
The Stonewall Variation is ECO A95. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Dutch Defense.
Stockfish evaluates the position after 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Be7 5. Nf3 O-O 6. O-O d5 7. Nc3 c6 at +0.55 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.
Both sides have pawns in the centre (White on d4, Black on d5), and one pawn capture is available, so the structure has not settled yet. Development is level at three minor pieces each. It is White to move. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.