Skewer Advanced Puzzle (Rated 928): Skewer — Win a Rook

In this middlegame position White trails in material, but activity trumps counting heads. The key idea is a skewer along the 8th rank: when the enemy king stands on the same line as a valuable piece, a checking rook forces the king to step away and leaves that piece exposed. Once the king abandons its defensive post, the rook behind it is captured. The sequence is forcing — check, forced king move, decisive material gain — and White's active rook and well-developed pieces make the winning combination possible.