Moscow Variation Puzzle (Rated 912): Win Material — Tactical Refutation

This middlegame puzzle is built around a pin and a tactical refutation. White’s active bishop and queen coordinate against the black king zone, while Black’s queen and bishop also create tension on the same diagonal. The key idea is that one piece is overworked: if the defender is removed, the pinned piece can no longer hold everything together. That turns a seemingly balanced position into a decisive material gain for White.