Openings Against D4 Puzzle (Rated 1200): Fork — Hanging Piece

A fork becomes especially powerful when one move creates a direct threat while attacking two valuable targets. In this Queen's Gambit Declined position, Black must recognize that a seemingly loose piece can exploit White's active queen and an exposed minor piece at the same time. The resulting tactical refutation overturns White's apparent material advantage and produces a decisive gain. This is a classic middlegame lesson: calculate forcing moves before reacting to an opponent's threats.