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I think it's fine but just not enough. Further I don't think a king next to another king can be checkmate, since I could make any move and my opponent would not be able to capture my king without exploding his.
Again I agree and again the response can only be rules is rules. If checkmate is the inability to move a King out of jeopardy (not the actual act of taking the King by the opponent) then this makes sense (in a funny sort of way).