Helper function for _bestmove_get_info.

        Extracts "pv" field from bestmove's info and returns move sequence in UCI notation.

def _get_info_pv(info):
        """
        Helper function for _bestmove_get_info.

        Extracts "pv" field from bestmove's info and returns move sequence in UCI notation.
        """
        search = re.search(pattern=PV_REGEX, string=info)
        return {"pv": search.group("move_list")}