Coordinate a rook and knight around a cornered king.
The rook and knight have different jobs. The rook gives check, while the knight protects the rook and controls a king escape square. The board edge limits the king’s remaining moves.
Bring your rook into the attack with check
Your rook gives check, so the opponent must answer it. In this continuation, your rook gives the final checkmate.
2 more clean runs (at any point) to reach Recall.