Queens Pawn Game Colle System Intermediate Puzzle (Rated 1334): Win Material — Discovered Attack

This middlegame puzzle shows how a well-timed attacking move can expose a vulnerable king and win material through a discovered attack. White’s pieces are coordinated against the kingside, while Black’s king safety is already weakened by an open file and loose defenders. The key idea is to create a direct threat that forces a defensive response, then use the resulting alignment to increase pressure on the king and a central piece at the same time. It is a classic example of tactical refutation in a classical chess structure.