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Can you give check with the king? Can you take your opponents king with your king? In normal chess, this is impossible, but in CCC, the first time a king moves, it moves as a queen, so it's possible to have a situation where one king has moved, and the other hasn't, threatening the other king.
The rules aren't clear about this; it's not mentioned in the differences with regular chess (that only mentions the king moving like a queen on his first turn), but such a situation is (obviously) not covered by the rules of regular chess.
AbigailII: No and no. The only difference between normal and cheshire cat chess (regarding king moves) is in the king's ability to make the first move as a queen. Only to make a move, nothing else. It still cannot move to an attacked square, cannot give a check, cannot capture opponent's king etc.