public void threadStart(Position pos, sbyte depth, int moveIndex, SecureFloat bestMove,
SecureFloat ansPlace, SecureFloat globalAlpha, SecureFloat globalBeta)
{
float value = alphaBeta(pos, depth, globalAlpha, globalBeta, false);
ansPlace.setValue(value);
if (!pos.whiteToMove)
{
if (value > globalAlpha.getValue())
{
globalAlpha.setValue(value);
bestMove.setValue(moveIndex);
}
}
else
{
if (value < globalBeta.getValue())
{
globalBeta.setValue(value);
bestMove.setValue(moveIndex);
}
}
}
public EvalResult eval(Position pos, int minDepth)
{
//Om minDepth är -1, skall datorn själv bestämma djup.
if (minDepth == -1)
{
minDepth = automaticDepth(pos);
}
List <Move> moves = allValidMoves(pos, true);
EvalResult result = new EvalResult();
int gameResult = decisiveResult(pos, moves);
if (gameResult != -2)
{
result.evaluation = gameResult;
result.allMoves = new List <Move>();
result.allEvals = null;
return(result); //Ställningen är avgjord.
}
else
{
List <SecureFloat> allEvals = new List <SecureFloat>();
float bestValue = pos.whiteToMove ? float.NegativeInfinity : float.PositiveInfinity;
if (moves.Count == 1)
{
//Spela forcerande drag omedelbart?
EvalResult res = eval(moves[0].execute(pos), minDepth - 1);
result.evaluation = evaluationStep(res.evaluation);
result.allMoves = moves;
result.bestMove = moves[0];
return(result);
}
// Ökar minimum-djupet om antalet tillgängliga drag är färre än de som anges
// i moveIncreaseLimits, vilka återfinns i EngineData.
foreach (int item in moveIncreaseLimits)
{
if (moves.Count <= item)
{
minDepth++;
}
else
{
break;
}
}
SecureFloat globalAlpha = new SecureFloat();
globalAlpha.setValue(float.NegativeInfinity);
SecureFloat globalBeta = new SecureFloat();
globalBeta.setValue(float.PositiveInfinity);
List <Thread> threadList = new List <Thread>();
SecureFloat bestMove = new SecureFloat(0);
for (int i = 0; i < moves.Count; i++)
//foreach (Move currentMove in moves)
{
Move currentMove = moves[i];
SecureFloat newFloat = new SecureFloat();
int iCopy = i;
allEvals.Add(newFloat);
Thread thread = new Thread(delegate()
{
threadStart(currentMove.execute(pos), (sbyte)(minDepth - 1), iCopy, bestMove, newFloat, globalAlpha, globalBeta);
});
thread.Name = currentMove.toString(pos);
thread.Start();
threadList.Add(thread);
}
//result.bestMove = moves[0];
Thread.Sleep(sleepTime);
for (int i = 0; i < allEvals.Count; i++)
{
SecureFloat threadResult = allEvals[i];
float value = threadResult.getValue();
#pragma warning disable CS1718 // Comparison made to same variable
if (value != value) //Kollar om talet är odefinierat.
#pragma warning restore CS1718 // Comparison made to same variable
{
//Om resultatet inte hunnit beräknas.
if (cancelFlag.getValue() != 0)
{
abortAll(threadList);
result.bestMove = null;
result.evaluation = float.NaN;
result.allEvals = null;
Thread.Sleep(10); //För att ge övriga trådar chans att stanna.
return(result);
}
else if (this.moveNowFlag.getValue() != 0)
{
abortAll(threadList);
Thread.Sleep(10); //För att ge övriga trådar chans att stanna.
result.bestMove = moves[(int)bestMove.getValue()];
return(result);
}
Thread.Sleep(sleepTime);
i--;
}
else
{
//Om resultatet är klart.
result.bestMove = moves[(int)bestMove.getValue()];
}
}
if (pos.whiteToMove)
{
result.evaluation = globalAlpha.getValue();
}
else
{
result.evaluation = globalBeta.getValue();
}
result.allEvals = allEvals;
}
result.allMoves = moves;
return(result);
}