Mate In 1 Puzzle (Rated 630): Spot Mate in 1 — Kingside Attack

This puzzle comes from a sharp middlegame in the Queens Gambit Accepted, where king safety matters more than material count. Even when one side appears better on paper, a vulnerable king can end the game instantly. The key idea is to notice how pieces coordinate around the enemy king’s shelter, especially when a queen and bishop create direct pressure on the h-file and nearby escape squares. In classical chess, these tactical patterns often decide the game before any endgame is reached.