Passed Pawn Puzzle (Rated 1707): Win — Rook Activity

In rook endgames, activity often outweighs material. An active rook can give checks, attack the opposing king, and support a passed pawn while the enemy rook is forced into passive defense. This position demonstrates how a well-timed checking idea transforms Black’s advanced pawn into a serious winning threat. The key strategic theme is coordination: the king restricts the opponent, the rook controls key ranks, and the passed pawn advances while White struggles to create counterplay.