Endgame Puzzle (Rated 1376): Use a Pin — Win Rook
This chess endgame demonstrates how a pin can turn an apparently vulnerable rook into a tactical weapon. The defending rook is tied to the king, creating a skewer along the open file. By recognizing that the attacker cannot safely move, you can exchange into a winning position and neutralize a dangerous passed pawn. The key idea is a forcing defensive move that gains decisive material while simplifying the position.