Queens Gambit Declined Baltic Defense Mate In 1 Puzzle (Rated 860): Spot Smothered Mate — Mate in 1

This puzzle is a classic middlegame mating pattern where the enemy king is boxed in by its own pieces and pawns. The key idea is that a knight can deliver a direct checkmate when the king has no escape squares and friendly pieces block the flight squares. In practical classical chess, these motifs often appear after a tactical refutation of an overextended position, especially when king safety is weakened and defenders are overloaded.