Queen's Gambit Declined: Semi-Tarrasch Defense, with e3

1.d4 d5 2.c4 c5 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nc6 6.Bd3

ECO D40

The Queen's Gambit Declined: Semi-Tarrasch Defense, with e3 is a chess opening line in the Queen's Gambit Declined complex, reached after 1.d4 d5 2.c4 c5 3.Nf3 Nf6 4.Nc3 e6 5.e3 Nc6 6.Bd3.

It is catalogued under code D40 in the Encyclopaedia of Chess Openings (ECO).

The defining move Bd3 is chosen by White on move 6.

Do you want to learn openings?

Start with a GM-authored repertoire you study move by move, then practice against a human-like AI opponent:

• Catalan Opening
• King's Indian Defense with ...e5

Every chess term used here is defined in the chess terms glossary. Browse all opening courses or the full ECO code index.