The Classical Variation is a variation of the Dutch Defense, catalogued as ECO A90. The line runs 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 d5 5. Nf3, reaching the position shown below after 9 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 Black to move after five moves.
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 Classical Variation goes 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 d5 5. Nf3. It is a variation of the Dutch Defense and is catalogued as ECO A90.
The Classical Variation is ECO A90. 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 d5 5. Nf3 at +0.52 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 two minor pieces each. It is Black to move.