Learn How to Clear the e-file: Decisive Material Gain
This puzzle is a classic middlegame tactical refutation built around clearance and removal of the defender. The key idea is to open a critical file so a major piece can invade, forcing the opponent into a sequence of captures that leaves their position materially worse. The position also shows how an apparently active rook can be a tactical liability when it is pinned, overloaded, or tied to defending another piece. Recognizing these hidden constraints is essential in classical chess.