Sacrifice Puzzle (Rated 926): Back Rank Mate — Mate in 2

This chess endgame puzzle is a classic back rank mate pattern disguised by material imbalance. White’s queen and rook coordinate to exploit the enemy king’s lack of luft, turning a seemingly ordinary middlegame/endgame position into a forced mating net. The key idea is that the defending rook is overloaded: it must respond to the check, but doing so opens the final file for a decisive finish. In classical chess, these tactical motifs often decide games instantly.