In football you are offside if you don’t have at least two players ahead of you (usually, but not necessarily the keeper and one defender)

A player is in an offside position if:

• any part of the head, body or feet is in the opponents’ half (excluding the halfway line) and

• any part of the head, body or feet is nearer to the opponents’ goal line than both the ball and the second-last opponent

Unless the king is equivalent to the goalie in this situation in which case it would be offside