Use a check when the king has no escape.
A rook or queen can give back-rank mate when the king’s own pieces block its escapes. The checking piece must be safe from capture, and the check must not be blockable. For defense, an escape square helps only if the opponent does not control it.
Bring your knight into the attack with check
Your knight 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.