Queens Gambit Declined Normal Defense Interference in Chess

Queens Gambit Declined Normal Defense Interference is a tactical motif in the QGD where White’s plan (often after 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7) relies on a move that “gets in the way” of Black’s usual defensive piece coordination. The defining feature is that a normal defense (commonly involving the queen, bishop, or knight that guards a key square/line) is disrupted by an intermediate move, forcing the defender to respond differently than intended.