D66Black4 book lines continue
Orthodox Defense, Fianchetto Variation
Queen's Gambit Declined1. 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
Also known as QGD: Orthodox, Main Line, Fianchetto Variation, Queen's Gambit Declined, Orthodox Defense, Fianchetto Variation, Orthodox Defense, QGD.