Queens Gambit Declined Chigorin Defense Mate In 1 Puzzle (Rated 871): Spot Mate in 1 — Queenside Attack

This puzzle comes from a Queen's Gambit Declined middlegame where the key idea is a sudden queenside attack against an exposed king. Even when the position looks balanced in material, tactical motifs can override everything if the enemy king is boxed in and the back rank or escape squares are weak. The winning move is a direct mating shot, so the main lesson is to always scan forcing checks before considering quieter strategic plans.