Queen's Gambit Declined: Semi-Slav, Koomen Variation

1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.e3 b5 6.a4 Bb4 7.Bd2 Qe7

ECO D31

The Queen's Gambit Declined: Semi-Slav, Koomen Variation is a chess opening line in the Queen's Gambit Declined complex, reached after 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.e3 b5 6.a4 Bb4 7.Bd2 Qe7.

It is catalogued under code D31 in the Encyclopaedia of Chess Openings (ECO).

The defining move Qe7 is chosen by Black on move 7.

Study this line with a grandmaster

This position is covered in the Opening Tricks Hall of Fame 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.