Blackmar Diemer Gambit Accepted Fork Puzzle (Rated 819): Mate in 2 — Fork Mate Pattern
This middlegame puzzle comes from the Blackmar-Diemer Gambit Accepted and shows how active pieces can overwhelm a king stuck in the center. White’s queen and rook coordination create a mating net, while the black king lacks safe squares and the back rank is vulnerable. The key idea is a forcing check that drags the king into a worse square, after which the follow-up attack lands with decisive force. It is a classic example of a short tactical finish built on king safety and piece activity.