[Event "Rules of atomic: Castling"] [Site "https://lichess.org/study/Y9Aj5y3j/tV1rwQvI"] [Result "*"] [Variant "Atomic"] [ECO "?"] [Opening "?"] [Annotator "https://lichess.org/@/Illion"] [FEN "8/8/8/8/1b6/P3p3/6k1/4K2R w K - 0 1"] [SetUp "1"] [UTCDate "2017.08.16"] [UTCTime "22:09:19"] [Source "https://lichess.org/study/Y9Aj5y3j/tV1rwQvI"] [Orientation "white"] { For completeness' sake, an explanation of castling. White cannot castle here because white is in check. } { [%csl Re1][%cal Rb4e1] } 1. axb4 e2 { Now white can castle. Even though black "attacks" f1 with the pawn, black's king on g2 means that white's king can safely pass through f1 (since "...exf1" would explode black's king, which is illegal.) } { [%csl Bg2,Bf1][%cal Re2f1] } 2. O-O *