Queen's Gambit Declined: Modern Variation, Normal Line

1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.Bg5 O-O 6.e3

ECO D55

The Queen's Gambit Declined: Modern Variation, Normal 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 Be7 5.Bg5 O-O 6.e3.

It is catalogued under code D55 in the Encyclopaedia of Chess Openings (ECO).

The defining move e3 is chosen by White on move 6.

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.