Pin Puzzle (Rated 1167): Win with a Queen Fork — Endgame Pin
This chess endgame puzzle shows how a queen can become the most dangerous piece when the enemy king is exposed and the coordination of the defenders is loose. The key idea is to use a forcing check to drag the king into a worse square, then keep the pressure with another check that creates a long pin and wins material. Even in a seemingly calm classical chess position, tactical motifs can decide the game immediately when the king and queen line up.