/// <summary>
/// Look for capture variations for horizon effect
/// </summary>
/// <param name="alpha"></param>
/// <param name="beta"></param>
/// <param name="nodeCount"></param>
/// <returns></returns>
int QuiescenceSearch(int alpha, int beta, ref int nodeCount)
{
nodeCount++;
int eval = Evaluation.Evaluate(Board);
if (eval >= beta)
{
return(beta);
}
if (eval > alpha)
{
alpha = eval;
}
var moves = MVVLVASorting(Board.GenerateMoves());
foreach (var capture in moves)
{
Board.MakeMove(capture);
eval = -QuiescenceSearch(-beta, -alpha, ref nodeCount);
Board.TakeBackMove(capture);
if (eval >= beta) // The move is too good
{
return(beta);
}
if (eval > alpha)// Best move so far
{
alpha = eval;
}
}
return(alpha);
}
/// <summary>
/// Process incoming commands
/// </summary>
/// <param name="input">Incoming string from interface</param>
public void Comunication(string input)
{
string command = input.Split(' ').First();
string messageBody = input.Substring(command.Length).Trim();
switch (command)
{
case "protover":
{
if (messageBody == "2")
{
Console.WriteLine(@"feature setboard=1 usermove=1 colors=0 reuse=1 time=1 myname=""The Turk"" name=1 done=1");
}
break;
}
case "force":
{
force = force ? false : true;
break;
}
case "new":
{
engine.Board.SetUpBoard();
GameHistory.Clear();
force = true;
break;
}
case "setboard":
{
engine.Board.Fen = messageBody;
GameHistory.Clear();
break;
}
case "quit":
{
Environment.Exit(Environment.ExitCode);
break;
}
case "usermove":
{
ReceivedMove(messageBody);
if (force) //Make move after received a move
{
Console.WriteLine("force mode is on");
var result = engine.Search(timer.timeForPerMove);
Console.WriteLine("move " + result.BestLine.First().IONotation());
engine.Board.MakeMove(result.BestLine.First());
GameHistory.Push(result.BestLine.First());
}
break;
}
case "go":
{
force = true;
var result = engine.Search(timer.timeForPerMove);
Console.WriteLine("move " + result.BestLine.First().IONotation());
engine.Board.MakeMove(result.BestLine.First());
GameHistory.Push(result.BestLine.First());
break;
}
case "undo":
{
engine.Board.TakeBackMove(GameHistory.Pop());
break;
}
case "level":
{
timer = new ChessClock(messageBody);
break;
}
case "st":
{
timer = new ChessClock("0 0 " + messageBody);
break;
}
case "fen": //just for testing purposes
{
engine.Board.Fen = "rn4kr/4p1bp/2pp4/1p3P1Q/2P1P3/6R1/PBp3PP/RN4K1 w - - 0 24 ";
GameHistory.Clear();
break;
}
case "score": //just for testing purposes
{
var score = Evaluation.Evaluate(engine.Board);
engine.Board.ShowBoard();
Console.WriteLine("score : " + score);
break;
}
case "show": //just for testing purposes
{
engine.Board.ShowBoard();
break;
}
}
}