Learn How to Spot Mate in 1: Pin Tactic
This middlegame puzzle comes from an Indian Defense structure where one tactical detail decides everything. The key idea is a pin that leaves the enemy king exposed and unable to respond to a direct rook invasion. Even though material is roughly balanced in the position, king safety is the real story. When a rook, bishop, or queen lines up on a vulnerable file or diagonal, a seemingly active piece can become the final defender of the king.