D40Black5 book lines continue
Semi-Tarrasch Defense, Symmetrical Variation
Queen's Gambit Declined1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 c5 5. e3 Nc6 6. Bd3 Bd6 7. O-O O-O
Also known as QGD: Semi-Tarrasch, Symmetrical Variation, Queen's Gambit Declined, Semi-Tarrasch Defense.