Scandinavian Defense Mieses Kotroc Variation Puzzle (Rated 1267): Trap a Hanging Queen

The undefended queen is one of the most punished mistakes in middlegame chess. When a heavy piece is attacked and completely unprotected, you can often build a forcing refutation that wins it outright. Here Black's active last move left the queen loose, and a rook switching onto that file attacks it directly. The queen's deep post backfires: every capture can be recaptured, while any retreat loses material along the same line. One forcing sequence turns the loose piece into a decisive material gain.