Learn How to Win Material: Discovered Attack
This puzzle comes from the Queen's Gambit Declined and shows a classic middlegame tactical refutation. White’s pieces are coordinated around a pinned knight and an exposed black queen-and-rook setup, so one forcing move can create a discovered attack while also winning material. The key idea is that a tactical shot can simultaneously remove a defender, open a line, and overload the opponent’s pieces. In positions like this, the best move is often the one that improves both activity and material balance at once.