You can play this game using the following ZRF (which I created in 2003):
http://www.zillions-of-games.com/cgi-bin/zilligames/submissions.cgi/47043?do=show;id=554
Certainly, Zillions-of-Games will see where your king (Zillions doesn't
really support games with hidden information). The computer's king is
hidden from human player by making its image transparent (so it is
invisible).