Mate In 4 Puzzle (Rated 1336): Force Mate in 4 — Back Rank Mate

This puzzle is a classic forcing attack built around a vulnerable king, overloaded defenders, and a rook invasion on the first rank. Even though the position is from the middlegame, the finish has the clean logic of a chess endgame tactic: every move is forcing, and the defender is dragged into a sequence that collapses the king’s shelter. The key idea is to use checks to control the opponent’s replies and create a mating net.