Attack the front piece to expose the one behind.
A skewer attacks a valuable piece with another piece behind it on the same line. When the front piece moves, the piece behind may become a target. Check the opponent’s replies: a king can sometimes move while protecting the rear piece.
Check before taking the rook
Your queen gives check. In this line, the opponent answers the check and your queen can take the rook.
2 more clean runs (at any point) to reach Recall.