The Classical Defense is a variation of the Queen's Gambit Accepted, catalogued as ECO D26. The line runs 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5, reaching the position shown below after 10 half-moves.
White holds the centre with pawns on d4, 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 five moves.
On the Queen's Gambit Accepted generally: Black accepts the gambit pawn but usually cannot hold it. Leads to active play for both sides.
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The Classical Defense goes 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5. It is a variation of the Queen's Gambit Accepted and is catalogued as ECO D26.
The Classical Defense is ECO D26. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Queen's Gambit Accepted.
Stockfish evaluates the position after 1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. e3 e6 5. Bxc4 c5 at +0.39 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.
White holds the centre with pawns on d4, 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.