Learn How to Win Material: Hanging Piece Refutation
This London System puzzle is a classic middlegame example of a hanging piece refutation. White has active pieces and pressure, but the position contains a tactical flaw: a key piece is left exposed while the king is still in the center. In practical classical chess, that often means the side to move can turn defense into a decisive material gain by forcing the king to recapture and then exploiting the loose back rank and overloaded pieces.