Presence or absence of king can be set, but even if there is a king, the check-rule does not apply to it, and it can be captured like any other piece (and its picture is different to emphasize this rule).
Otherwise the rules of chess apply, with the following difference:
Note: if the player on turn has pieces but no legal moves, it is a stalemate, i.e. draw.
Uray M. János, 2013