No.12359594 ViewReplyOriginalReport
Can kings check other kings?

No. A king may not move to a square next to another king, because then this move would put the king that moves also into check, which is illegal.

It is possible to make a move with a king such that the other king is checked (or even mated): suppose that whites king is between whites rook and blacks king on one line. When the king moves away from the line, he discloses the check by the rook. (I'll add a diagram in the future.)