Home › Openings › Queen's Gambit Declined › Queen's Gambit Declined: Modern Variation Queen's Gambit Declined: Modern Variation, Knight Defense ECO D51 · 1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 Nbd7 Related variationsQueen's Gambit Declined: Modern Variation, Heral VariationQueen's Gambit Declined: Modern Variation, Normal Line Practice this opening · Play against the computer