D63White4 book lines continue
Orthodox Defense, Swiss, Carlsbad 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 8. cxd5
Also known as QGD: Orthodox, Swiss, Karlsbad Variation, Queen's Gambit Declined: Orthodox Defense: Swiss, Karlsbad Variation, QGD: Orthodox defence, Swiss, Karlsbad variation.