// send the list of possible moves of the clicked
    private void PossiblePathAckEvent(string reqData, Hashtable roomClassList)
    {
        /* isHost+":"+roomNo+":"+"PossibleMoveReq"+":"+myPieceName+":"+myStartPos
         */
         List<int> PossibleMoveList = new List<int>();
         roomData = reqData.Split(':');
        try
        {   /* roomClassList: key = room number, value = room class
             * find a right room for received room number from a client
             * and send acknowledgement
             */
            room = (RoomHandler)roomClassList[roomData[1]];
            if (room.isStart == true)
            {
                /* only startPos and finalPos are needed to proceed the movement
                 * since the server knows a board status
                 */
                PossibleMoveList = room.getPossibleMove(int.Parse(roomData[4]));

                /* send to the client only if PossibleMoveList contains an integer value
                 * meaning the clicked piece can be moved
                 */
                if (PossibleMoveList != null)
                {
                    Send(string.Join(":", PossibleMoveList) + ":" + roomData[4] + ":PossiblePathAck");
                }
            }
            else Send("NotStartNoti");
        }
        //Handle Exception
        catch (Exception ex)
        {
            Console.WriteLine(ex);
            return;
        }
    }