Learn How to Win Material: Hanging Piece
This puzzle comes from the Queen's Gambit Declined Exchange Variation and shows how a single hanging piece can decide the game. White has active pieces and pressure near the black king, but the immediate tactical point is that Black can win material by exploiting an undefended knight and the loose coordination around it. In practical chess, these positions reward concrete calculation over general plans, especially when king safety and piece activity collide in the middlegame.