Learn How to Spot Back Rank Mate: Mate in 3
This middlegame puzzle shows how a seemingly active queen and rook can work together to trap the king on the back rank. The key idea is to use forcing checks to drag the king into a vulnerable square, then exploit the lack of escape squares and the overloaded defender. Even in classical chess, a large material lead can matter less than king safety when the enemy king is boxed in and the back rank is weak.