Sicilian Defense Marshall Counterattack Mate In 1 Puzzle (Rated 1198): Spot Back Rank Mate — One-Move Finish

This chess endgame puzzle is a classic back rank mate pattern: the king is boxed in by its own pieces and cannot escape the final checking line. Even when one side is materially ahead, a single open file and a poorly placed rook can decide the game immediately. In classical chess, these tactical finishes often appear after simplification, when the board is less crowded and king safety becomes the main factor.