Learn How to Spot Mate in 1: Back Rank Mate
This middlegame puzzle from the Vienna Game shows how a single active rook can decide the game when the enemy king is boxed in. The key idea is a back rank mate pattern: the king has no flight squares, the defending pieces are overloaded, and a pinned rook cannot help. Even though Black is materially ahead, White’s piece activity and king safety create a forced finish. It is a classic example of how tactical coordination can outweigh material.