int Quiesce(int alpha, int beta, int depth)
{
if (depth == maxQuiesceDepth)
{
return(StaticEval());
}
var moves = GetMoves(0, 0);
IEnumerable <int> selected;
if (board.GetCheckCount(board.ToMove) > 0)
{
if (moves.Count() == 0)
{
return(-INFINITE);//mate
}
//depth -= 1;
selected = moves;
}
else
{
selected = moves.Where(k => (k & MovePackHelper.Capture) != 0 || MovePackHelper.GetPromotion(k) != PromotionTo.None);
}
if (selected.Count() == 0)
{
return(StaticEval());
}
foreach (var move in selected)
{
board.Move(move);
var score = -Quiesce(-beta, -alpha, depth + 1);
board.UndoMove();
if (score > alpha)
{
alpha = score;
}
if (alpha >= beta) // current player move is better than the other one better, no reason to search further
{
//beta cutoff !!!
break;
}
}
return(alpha);
}
private int GetWeight(int m, int best, int k1, int k2)
{
int val = (m & MovePackHelper.GoodCapture) != 0 ? 1000 : 0;
if ((m & MovePackHelper.Capture) != 0 && (m & MovePackHelper.GoodCapture) == 0)
{
val -= 1000;
}
PromotionTo to;
if ((to = MovePackHelper.GetPromotion(m)) != PromotionTo.None)
{
switch (to)
{
case PromotionTo.Queen:
val += 1000;
break;
case PromotionTo.Knight:
val += 500;
break;
case PromotionTo.Bishop:
val -= 1000;
break;
case PromotionTo.Rook:
val -= 1000;
break;
}
}
if (m == k1 || m == k2)
{
val += 5000;
}
if (m == best)
{
val += 10000;
}
return(val);
}