Pin Puzzle (Rated 686): Pin — Rook Endgame

In a rook endgame, king safety and rook activity can outweigh material count. A pinned pawn may appear vulnerable, but moving it can expose the king to a skewer or direct attack. The key defensive idea is to use the rook actively to restrict the opposing king while creating pressure against a dangerous passed pawn. This is a practical chess endgame lesson in finding a quiet move that neutralizes threats and preserves the balance.