This is a recreational chess puzzle question. I'm interested in knowing if white's rook and a knight, can force black lone king to stalemate, without ever using in any way the white king. For simplify purposes let's assume the white king's in not even on the board, we have R+N vs K, there is not inmediate capture or fork of any of white's pieces. Can white manage to stalemate black's king? What's the algorithm? (black must not have any square to go but does not have to be in check).
It's not hard to come up that in this setup white can't mate black king, from retrograde analysis from a checkmated position (you can do that yourself).