The Orthodox Defense, Swiss, Carlsbad Variation is a variation of the Queen's Gambit Declined, catalogued as ECO D63. The line runs 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 a6 8. cxd5, reaching the position shown below after 15 half-moves.
White holds the centre with pawns on d4 and d5, and one pawn capture is available, so the structure has not settled yet. Development is level at three minor pieces each, and White is up a pawn of material. It is Black to move after eight moves. Black has castled while White’s king is still uncommitted; White has doubled pawns on the d-file.
On the Queen's Gambit Declined generally: A solid and respected response to the Queen's Gambit. Black maintains a strong central presence.
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The Orthodox Defense, Swiss, Carlsbad Variation goes 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 a6 8. cxd5. It is a variation of the Queen's Gambit Declined and is catalogued as ECO D63.
The Orthodox Defense, Swiss, Carlsbad Variation is ECO D63. ECO codes group openings by their move order, so nearby codes cover closely related lines of the Queen's Gambit Declined.
Stockfish evaluates the position after 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 a6 8. cxd5 at +0.42 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 d5, and one pawn capture is available, so the structure has not settled yet. Development is level at three minor pieces each, and White is up a pawn of material. It is Black to move. Black has castled while White’s king is still uncommitted; White has doubled pawns on the d-file.