The lichess page is -[[ lichess.org/variant/atomic ]]-
More details (for castling, en passant, adjacent kings) and examples are given here -[[ lichess.org/forum/team-illions-atomic-blog/rules-of-atomic ]]-
More details (for castling, en passant, adjacent kings) and examples are given here -[[ lichess.org/forum/team-illions-atomic-blog/rules-of-atomic ]]-