Ruy Lopez Back Rank Mate Beginner Puzzle (Rated 914): Back Rank Mate — One-Move Finish

This puzzle shows a classic back rank mate pattern in a sharp middlegame. The key idea is that the enemy king has very little room to escape, while its own pieces and pawns help block the flight squares. When a rook can invade the first rank with check, the position can collapse immediately if the king has no safe square and no piece can interpose. These are the kinds of tactics that often decide classical chess games in one move.