Helper function for _bestmove_get_info.

        Extracts (integer) values for single value fields.

def _get_info_singlevalue_subfield(info, field):
        """
        Helper function for _bestmove_get_info.

        Extracts (integer) values for single value fields.
        """
        search = re.search(pattern=field + " (?P<value>\d+)", string=info)
        return {field: int(search.group("value"))}