Learn How to Spot Mate in 1: Back Rank Mate
This middlegame puzzle is a classic mating net built around a vulnerable king, active rook, and overloaded defenders. The key idea is to notice when the enemy king has no safe flight squares and the back rank or surrounding squares are blocked by its own pieces. In positions like this, a rook can often deliver immediate mate if the line to the king is open and the defender cannot interpose or capture in time.