Queen's Gambit Declined

...e6, ...Be7, ...O-O: the setup that's held up at every level for 150 years. Solid against the Exchange, active against Bg5 and Bf4 mains.

• Learn–Easy Memory: drill the points where your lines split.
• Practice–Play whole lines against an opponent that follows your book.
• DrillAll courses–Spaced review of every course's due moves.
• Time–Your prompts against a 60-second clock.
• PuzzlesAll coursesReal games from your positions: find the missed move.
• Arena–Rated games from this opening. Leaving prep costs rating.