Blackmar Diemer Gambit Accepted Sacrifice Puzzle (Rated 1178): Spot Back Rank Mate — Mate in 3

This middlegame puzzle is a classic example of a back rank mate pattern built around king safety and forcing checks. White’s queen and rook coordinate to overload the defender and exploit the cramped black king position. The key idea is that the first check drags the king into a vulnerable square, where a follow-up queen move creates a decisive mating net. The final rook lift lands on the back rank with support, turning material pressure into a forced finish.