Queen's Gambit Declined: Orthodox Defense, Fianchetto Variation

1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c6 5.Nf3 Be7 6.e3 Nbd7 7.Rc1 O-O 8.Bd3 dxc4 9.Bxc4 b5

ECO D66

The Queen's Gambit Declined: Orthodox Defense, Fianchetto Variation is a chess opening line in the Queen's Gambit Declined complex, reached after 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c6 5.Nf3 Be7 6.e3 Nbd7 7.Rc1 O-O 8.Bd3 dxc4 9.Bxc4 b5.

It is catalogued under code D66 in the Encyclopaedia of Chess Openings (ECO).

The defining move b5 is chosen by Black on move 9.

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.