Queen Vs Rook And Four Pawns Puzzle (Rated 1242): Pin — Rook Tactic
A pin becomes especially powerful when a valuable piece is aligned with its king. In this chess endgame, the rook uses that alignment to attack the queen while restricting its legal movement. The tactic combines a pin with a skewer: the queen is threatened, but moving it would expose the king. This creates a decisive material gain and turns an apparently vulnerable rook into the most active piece on the board.