White’s natural moves (developing knights, fianchettoing) walk right into tactical nightmares. The pawn on d4 acts as a wedge, blocking White’s c3 knight and limiting the c1 bishop.
Unlike "trap" gambits, even if White plays perfectly, Black gets immense positional pressure and easy development. It is a favorite of Grandmasters like Magnus Carlsen for its practical winning chances. 2. The Englund Gambit (The "Trap" Specialist) gambit against d4