Home › Openings › Queen's Gambit Declined › Queen's Gambit Declined: Harrwitz Attack Queen's Gambit Declined: Harrwitz Attack, Orthodox Defense ECO D37 · 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Nf3 Be7 5. Bf4 O-O 6. e3 c6 Related variationsQueen's Gambit Declined: Harrwitz Attack, Two Knights DefenseQueen's Gambit Declined: Harrwitz Attack, Fianchetto DefenseQueen's Gambit Declined: Harrwitz Attack, Main Line Practice this opening · Play against the computer