Rubinstein Opening Puzzle (Rated 1007): Win Material — Tactical Refutation

This middlegame puzzle is about turning active piece placement into a decisive material gain. Black’s bishop and queen coordinate to exploit loose white pieces, especially the undefended bishop and the vulnerable knight behind it. The key idea is that a forcing check can drag the king into a worse square, after which the queen wins material with tempo. This is a classic example of tactical refutation: one accurate sequence converts pressure, king safety, and piece activity into a winning advantage.