[Event "Rules of atomic: Adjacent kings"] [Site "https://lichess.org/study/Y9Aj5y3j/8gu21f1H"] [Result "*"] [Variant "Atomic"] [ECO "?"] [Opening "?"] [Annotator "https://lichess.org/@/Illion"] [FEN "8/6kP/4p3/4K3/8/8/8/8 w - - 0 1"] [SetUp "1"] [UTCDate "2017.08.16"] [UTCTime "22:00:05"] [Source "https://lichess.org/study/Y9Aj5y3j/8gu21f1H"] [Orientation "white"] { It is illegal to play a move that explodes your own king. This means that kings cannot capture, and cannot capture each other. So in atomic chess, kings can be next to each other. } 1. h8=Q+ Kf6 { While the kings are connected, there is no check. (Here "Qxf6" is illegal since white's king would also die.) } { [%csl Be5,Bf6] } 2. Qh6 { Check still does not apply. } 2... Kf5 3. Kd6 Ke5 { White cannot play "Qxe6" here, since white's king would die in the explosion. } { [%csl Bd6,Be5,Be6][%cal Bh6e6] } 4. Kc7 Kd6 { Here, however, white can play Qxe6# exploding the black king and winning, since white's king remains on the board. } { [%csl Re6,Rd6][%cal Rh6e6] } 5. Qxe6# *