Learn How to Win Material: Pin Sacrifice
This middlegame puzzle from the Catalan Opening shows how a pinned piece can become the target of a forcing tactical sequence. White has active pieces, pressure on the seventh rank, and a queen that helps overload the defender. The key idea is to use a sacrifice to remove the key blocker, then follow up with a forcing move that wins material. In classical chess, these patterns often appear when one piece is pinned to a more valuable target.