/**
     * Change Gameadmin privileagues to player with given playerId
     *
     * @param Int $playerId
     */
    public static function grant($playerId) {
        $query = 'UPDATE players SET ' .
                 'is_admin = 0 ' .
                 'WHERE playerId IN ( ' .
                 '  SELECT id ' .
                 '  FROM players ' .
                 '  WHERE game_id = ( ' .
                 '      SELECT game_id ' .
                 '      FROM players ' .
                 '      WHERE id = ? ' .
                 '  ) ' .
                 '); ' .
                 'UPDATE players SET ' .
                 'is_admin = 1 ' .
                 'WHERE playerId = ?;';

        return self::$db->query($query, array($playerId, $playerId))->rowCount() > 0;
    }