Driving the lone king to the edge of the board
Rook seals a rank, king walks up to face, rook slides across for mate. Same pattern every time.
King walks up. Take the opposition.
3 more clean runs (at any point) to reach Recall.
Lone king, rook, and your king. Walk up, box in, slide across.
3 more clean runs (at any point) to reach Recall.