I have reviewed the rules and suggest the following text replace the current second dot point in the rules ...

There is no check in Atomic Chess although there is checkmate (see below). A player who's King is in jeopody does not need to move the King but if they do not make a winning move then the opponent will capture the King in the next move. This has three significant consequences: a player can move a piece which would put the King into conventional check (including the King); a player can castle out of, through or into check; and a player can move their King adjacent to the another King. In this last instance neither King can be taken directly because it would explode their own King at the same time, but a situation may arise where one King is pinned against the edge of the board without a non-check move (therefore in checkmate) and thus lose the game.