Home › Openings › Queen's Gambit Declined › Queen's Gambit Declined: Harrwitz Attack Queen's Gambit Declined: Harrwitz Attack, Main Line ECO D37 · 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Be7 5. Bf4 O-O 6. e3 c5 7. dxc5 Bxc5 Related variationsQueen's Gambit Declined: Harrwitz Attack, Two Knights DefenseQueen's Gambit Declined: Harrwitz Attack, Fianchetto DefenseQueen's Gambit Declined: Harrwitz Attack, Orthodox Defense Practice this opening · Play against the computer