Scotch Game Hanging Piece Intermediate Puzzle (Rated 849): Spot Mate in 1 — Back Rank Mate

This puzzle is a classic example of a back rank mate in a sharp middlegame. The key idea is that the enemy king’s escape squares are restricted by its own pieces and pawn cover, while a heavy piece can deliver the final blow on the first rank. These positions often look like a material battle, but the real story is king safety: one loose line and one undefended square can end the game immediately.