French Defense Pin Puzzle (Rated 1010): Spot a Mate in 1 — Bishop Pin

This middlegame puzzle is a classic example of king safety deciding the game immediately. White’s king is stuck in the center, while Black’s pieces coordinate around the king zone with a powerful bishop and rook battery. The key idea is that a pinned piece can’t help defend the king, so a seemingly ordinary bishop move becomes a direct mating blow. In classical chess, these patterns often appear when development is lagging and the king has no safe shelter.