Learn How to Win Material: Pin Tactic
This puzzle comes from the Queen's Gambit Declined and shows a classic opening pin that turns into a winning tactical sequence. White has active pieces and pressure on the c6 knight, but Black can use the bishop on b4 to create a powerful pin against the queen and the king at the same time. The key idea is that a pinned piece can become overloaded, allowing Black to win material and seize the initiative in the middlegame.