Sacrifice Puzzle (Rated 1163): Spot Back Rank Mate — Mate in 3

This puzzle is a classic middlegame example of king safety turning into a forced mating net. Even though one side is materially ahead, the exposed king and weak back-rank control make tactics far more important than material. The key idea is to use forcing checks to drag the king into a vulnerable square, then coordinate queen and rook pressure so the defender has no useful escape squares. In practical chess, these patterns often decide games instantly.