-record(three_fold_position, {
    turn :: color:color(),
    board :: board:board_bb(),
    en_passant :: gleam@option:option(position:position()),
    white_kingside_castle :: castle_rights:castle_rights(),
    white_queenside_castle :: castle_rights:castle_rights(),
    black_kingside_castle :: castle_rights:castle_rights(),
    black_queenside_castle :: castle_rights:castle_rights()
}).