Bishop's Opening Berlin Defense Puzzle (Rated 1417): Win Material — Tactical Refutation

This middlegame puzzle is about turning king safety and piece activity into a clean material win. White’s rook activity on the open file creates a forcing check that drags the black king into an awkward square, while the loose knight becomes the real target. The key idea is that a checking move can improve the position by forcing the defender to respond, after which the hanging piece can be taken. It is a classic example of a tactical refutation in classical chess.