Queens Pawn Game Colle System Sacrifice Puzzle (Rated 884): Clear the Kingside — Mate in 2

This middlegame puzzle is a classic kingside attack where clearance is the key idea. White’s pieces are already aimed at the enemy king, but the final breakthrough only works after removing a defender and opening a line for the queen. The position also shows how active piece placement can turn a small tactical edge into a forced finish. When the king’s shelter is overloaded, even a single forcing move can decide the game.