Bird Opening Deflection Intermediate Puzzle (Rated 1142): Back Rank Mate — Mate in 3

This middlegame puzzle shows how a king with limited flight squares can be punished by a forcing queen sacrifice. White’s pieces are active, the rook on the f-file is ready to join the attack, and Black’s king is boxed in by its own pieces. The key idea is deflection: lure a defender away so the final rook invasion becomes unavoidable. Even when material is down, direct king safety and coordination can outweigh static balance in classical chess.