Rook Sacrifice Anastasia's Mate Puzzle: Anastasia — Rook Sac

The Anastasia mate is a mating pattern built around a trapped king, a controlling knight, and a rook attacking along the side of the board. In this chess endgame, the king is restricted near the corner while the knight takes away key escape squares. The rook sacrifice removes the final defender and forces the king into a mating net. The idea looks materialistic at first, but the exposed king matters more than the rook.