Scandinavian Defense Sacrifice Puzzle (Rated 810): Spot Back Rank Mate — Mate in 2

This middlegame puzzle is a classic example of a back rank mate pattern. The key idea is to exploit a cramped king and a vulnerable back rank, where a forcing sacrifice can remove the defender and open a direct mating line. Even though material may look balanced or even unfavorable at first glance, tactical geometry matters more than countable pieces. The winning idea uses check, capture, and a final rook invasion to finish the game.