D06 — Queen's Gambit

Closed & Semi-Closed Games (D00–D99)

ECO D06 covers Queen's Gambit and related lines (Queen's Gambit, Queen's Gambit Declined: Austrian Defense, Queen's Gambit Declined: Baltic Defense, Queen's Gambit Declined: Marshall Defense). Main line 1. d4 d5 2. c4 with variations, statistics, and the best responses.