Online Circular Chess in Silverlight, ASP.NET AJAX, WCF Web Services, and LINQ to SQL

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

namespace CChess
{
    [ServiceContract(Namespace = "CChessService")]
	public interface ICChessService
    {
        [OperationContract]
        void Login(CChessPlayer new_player);

        [OperationContract]
        void UpdateUserActivity();

        [OperationContract]
        List<CChessPlayer> GetOnlineUsers();

        [OperationContract]
        void SendMessage(String message);

        [OperationContract]
        List<ChatMessage> GetNewMessages(int unix_timestamp);

        [OperationContract]
        List<ChatMessage> GetLastNMessages(int n);

        [OperationContract]
        void CreateNewGame(CChessGameColors color);

        [OperationContract]
        List<CChessGamesPlayers> GetCurrentGamePlayers();

        [OperationContract]
        void AddToGame(long game_id, CChessGameColors color);

        [OperationContract]
        CChessGamesPlayers GetOpponent();

        [OperationContract]
        CChessGamesPlayers GetYou();

        [OperationContract]
        long MovePiece(CChessMove move);

        [OperationContract]
        CChessMove GetLastMove(long last_move_id);

        [OperationContract]
        List<CChessMove> GetAllMoves(long game_id);
    }
}