Qxd4 Puzzle (Rated 1500): Back Rank Mate — Weak Back Rank
A weak back rank is a powerful tactical target when a king has limited escape squares and its own pieces restrict movement. In this position, Black exploits the vulnerability around White’s king while also addressing a loose rook. The key idea is to recognize that king safety can outweigh material and activity: a seemingly strong position may collapse when a queen enters with tempo and creates multiple threats against exposed pieces.