D52Black13 book lines continue
Cambridge Springs Defense
Queen's Gambit Declined1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 Nbd7 6. e3 Qa5
Also known as Queen's Gambit Declined: Cambridge Springs Variation, Queen's Gambit Declined, Cambridge Springs Variation, Cambridge Springs; Pillsbury Variation, QGD.