Learn How to Skewer: Winning Material
This middlegame puzzle is built around a short skewer on the d-file, where a rook check forces the king to move and leaves a valuable piece exposed behind it. The key idea is that the checking piece is not the real target; it is the line behind it. In practical classical chess, these tactics often arise when the king is slightly exposed and rooks are active on open files. The result is a decisive material gain rather than a quiet positional squeeze.