Sicilian Defense Trapped Piece Intermediate Puzzle (Rated 969): Win Material — Discovered Attack

This chess endgame puzzle is built around a forcing discovered attack that wins material by exploiting a pinned and trapped piece. White’s active rook and knight coordinate to create immediate threats against the black king and back rank, while the black rook is overloaded and unable to defend everything at once. The key idea is not a mating net, but a decisive tactical sequence that converts activity into a large material gain in classical chess.