Queens Gambit Declined Marshall Defense Beginner Puzzle (Rated 1116): Win Material — Tactical Refutation

This Queen's Gambit Declined puzzle shows how a long opening line can suddenly turn into a decisive tactical refutation. White’s pieces look active, but the position contains a loose bishop, an overloaded queen, and a vulnerable king in the center. Black’s best play uses forcing moves to exploit checks, pins, and a hanging piece. The key lesson is that in classical chess, material balance can collapse quickly when one tactical detail is ignored.