Queen's Gambit

Offer the c-pawn to pull Black’s d-pawn off the center, then take it back with a piece and use the half-open c-file.

Strong against

Orthodox Defense
Tarrasch Defense

Weak against

Slav Defense
Albin Countergambit

Variations

Queen's Gambit Declined1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Be7 5. e3 O-OQueen's Gambit AcceptedLockedWin Queen's Gambit Declined to unlockSlav DefenseLockedWin Queen's Gambit Accepted to unlockSemi-Slav DefenseLockedWin Slav Defense to unlockAlbin CountergambitLockedWin Semi-Slav Defense to unlock

Opponent level

Hangs pieces. Then asks if that was theory.