D63Black8 book lines continue
Orthodox Defense, Henneberger Variation
Queen's Gambit Declined1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bg5 O-O 6. e3 Nbd7 7. Rc1 a6
Also known as QGD: Orthodox, Swiss Variation, Queen's Gambit Declined, Orthodox Defense, Henneberger; Swiss Variation, QGD.