Rook Endgame Intermediate Puzzle (Rated 1068): Win a Rook Endgame — Decisive Material Gain

This chess endgame puzzle is about a tactical refutation in a rook endgame where active piece placement and king activity decide the game. The key idea is to recognize when an apparently strong rook on the seventh rank can be challenged and removed, even if that means entering a simplified position. Once the major pieces are exchanged, the passed pawn and king coordination become the real winning factors. In classical chess, these endgame transitions often decide whether an advantage is converted cleanly.