private static ResultBoards GetSortValidMoves(Board examineBoard)
{
ResultBoards resultBoards = new ResultBoards()
{
Positions = new List <Board>(30)
};
Search.piecesRemaining = 0;
for (byte srcPosition = 0; (int)srcPosition < 64; ++srcPosition)
{
Square square = examineBoard.Squares[(int)srcPosition];
if (square.Piece != null)
{
++Search.piecesRemaining;
if (square.Piece.PieceColor == examineBoard.WhoseMove)
{
foreach (byte validMove in square.Piece.ValidMoves)
{
Board board = examineBoard.FastCopy();
Board.MovePiece(board, srcPosition, validMove, ChessPieceType.Queen);
PieceValidMoves.GenerateValidMoves(board);
if ((!board.WhiteCheck || examineBoard.WhoseMove != ChessPieceColor.White) && (!board.BlackCheck || examineBoard.WhoseMove != ChessPieceColor.Black))
{
Evaluation.EvaluateBoardScore(board);
board.Score = Search.SideToMoveScore(board.Score, board.WhoseMove);
resultBoards.Positions.Add(board);
}
}
}
}
}
resultBoards.Positions.Sort(new Comparison <Board>(Search.Sort));
return(resultBoards);
}
private static int Quiescence(Board examineBoard, int alpha, int beta, ref int nodesSearched)
{
nodesSearched = nodesSearched + 1;
Evaluation.EvaluateBoardScore(examineBoard);
examineBoard.Score = Search.SideToMoveScore(examineBoard.Score, examineBoard.WhoseMove);
if (examineBoard.Score >= beta)
{
return(beta);
}
if (examineBoard.Score > alpha)
{
alpha = examineBoard.Score;
}
List <Search.Position> positionList = examineBoard.WhiteCheck || examineBoard.BlackCheck ? Search.EvaluateMoves(examineBoard, (byte)0) : Search.EvaluateMovesQ(examineBoard);
if (positionList.Count == 0)
{
return(examineBoard.Score);
}
positionList.Sort(new Comparison <Search.Position>(Search.Sort));
foreach (Search.Position position in positionList)
{
if (Search.StaticExchangeEvaluation(examineBoard.Squares[(int)position.DstPosition]) < 0)
{
Board board = examineBoard.FastCopy();
Board.MovePiece(board, position.SrcPosition, position.DstPosition, ChessPieceType.Queen);
PieceValidMoves.GenerateValidMoves(board);
if ((!board.BlackCheck || examineBoard.WhoseMove != ChessPieceColor.Black) && (!board.WhiteCheck || examineBoard.WhoseMove != ChessPieceColor.White))
{
int num = -Search.Quiescence(board, -beta, -alpha, ref nodesSearched);
if (num >= beta)
{
Search.KillerMove[2, 0].SrcPosition = position.SrcPosition;
Search.KillerMove[2, 0].DstPosition = position.DstPosition;
return(beta);
}
if (num > alpha)
{
alpha = num;
}
}
}
}
return(alpha);
}
