Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line

1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bd3

ECO D42

The Queen's Gambit Declined: Semi-Tarrasch Defense, Main Line is a chess opening line in the Queen's Gambit Declined complex, reached after 1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bd3.

It is catalogued under code D42 in the Encyclopaedia of Chess Openings (ECO).

The defining move Bd3 is chosen by White on move 7.

Study this line with a grandmaster

This position is covered in the Catalan Opening course: a GM-authored repertoire you study move by move, then practice against a human-like AI opponent.

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