The Delayed, f4 before Nf3 is a variation of the Stonewall Attack, catalogued as ECO D00. The line runs 1. d4 d5 2. e3 Nf6 3. f4 e6 4. Nf3 c5 5. c3 Nc6 6. Bd3 Bd6, reaching the position shown below after 12 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 two minor pieces each. It is White to move after six moves.
On the Stonewall Attack generally: White builds a solid pawn wall on d4-e3-f4-c3 with the bishop on d3. A straightforward attacking system aimed at the kingside.
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The Delayed, f4 before Nf3 goes 1. d4 d5 2. e3 Nf6 3. f4 e6 4. Nf3 c5 5. c3 Nc6 6. Bd3 Bd6. It is a variation of the Stonewall Attack and is catalogued as ECO D00.
The Delayed, f4 before Nf3 is ECO D00. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Stonewall Attack.
Stockfish evaluates the position after 1. d4 d5 2. e3 Nf6 3. f4 e6 4. Nf3 c5 5. c3 Nc6 6. Bd3 Bd6 at -0.09 at depth 18, which is balanced. 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 two minor pieces each. It is White to move.