Sacrifice Advanced Puzzle (Rated 1144): Spot Back Rank Mate — Mate in 3

This chess puzzle is a classic back rank mate pattern wrapped in a forcing tactical sequence. The key idea is that the enemy king has limited flight squares because its own pawns and pieces block escape routes. When the attacking side can create a direct check on the back rank, the defender is often forced into a narrow response that only delays the inevitable. In practical classical chess, these motifs appear when rooks and queens coordinate around a cramped king.