public ChessBoardColorState GetBoardState(ChessPieceColor color)
{
ChessBoardColorState boardState = null;
if (color == ChessPieceColor.White)
{
boardState = whiteBoardState;
}
else
{
boardState = blackBoardState;
}
return(boardState);
}
public ChessBoardColorState(ChessBoardColorState stateToCopy)
{
this.Pieces = stateToCopy.Pieces;
this.Pawns = stateToCopy.Pawns;
this.Knights = stateToCopy.Knights;
this.Bishops = stateToCopy.Bishops;
this.Rooks = stateToCopy.Rooks;
this.Queens = stateToCopy.Queens;
this.King = stateToCopy.King;
this.KingsideCastlingPossible = stateToCopy.KingsideCastlingPossible;
this.QueensideCastlingPossible = stateToCopy.QueensideCastlingPossible;
}
public bool GetPiece(ChessPositionIndex index, out ChessPieceType pieceType, out ChessPieceColor pieceColor)
{
bool res = false;
UInt64 pos = (UInt64)1 << (int)index;
pieceType = ChessPieceType.None;
pieceColor = ChessPieceColor.None;
for (ChessPieceColor color = ChessPieceColor.White; color <= ChessPieceColor.Black; color++)
{
ChessBoardColorState boardState = GetBoardState(color);
if ((boardState.Pieces & pos) != 0)
{
pieceColor = color;
if ((boardState.Pawns & pos) != 0)
{
pieceType = ChessPieceType.Pawn;
}
else if ((boardState.Knights & pos) != 0)
{
pieceType = ChessPieceType.Knight;
}
else if ((boardState.Bishops & pos) != 0)
{
pieceType = ChessPieceType.Bishop;
}
else if ((boardState.Rooks & pos) != 0)
{
pieceType = ChessPieceType.Rook;
}
else if ((boardState.Queens & pos) != 0)
{
pieceType = ChessPieceType.Queen;
}
else if ((boardState.King & pos) != 0)
{
pieceType = ChessPieceType.King;
}
res = true;
break;
}
}
return(res);
}
private void MoveRookWhenCastling(ChessPieceColor color, ChessPositionIndex fromIndex, ChessPositionIndex toIndex, ChessMoveInfo moveInfo)
{
ulong rookFromPos = Precomputed.IndexToBitBoard[(int)fromIndex];
ulong rookToPos = Precomputed.IndexToBitBoard[(int)toIndex];
ChessBoardColorState boardState = GetBoardState(color);
boardState.Pieces &= ~rookFromPos;
boardState.Pieces |= rookToPos;
boardState.Rooks &= ~rookFromPos;
boardState.Rooks |= rookToPos;
if (moveInfo != null)
{
moveInfo.SecondaryFromIndex = fromIndex;
moveInfo.SecondaryToIndex = toIndex;
}
}
/// <summary>
/// Makes a copy of a chess board.
/// </summary>
/// <param name="boardToCopy"></param>
public ChessBoard(ChessBoard boardToCopy, bool copyExtra)
{
this.Game = boardToCopy.Game;
this.whiteBoardState = new ChessBoardColorState(boardToCopy.whiteBoardState);
this.blackBoardState = new ChessBoardColorState(boardToCopy.blackBoardState);
this.enPassantTarget = boardToCopy.enPassantTarget;
this.count50MoveRule = boardToCopy.count50MoveRule;
this.capturedPieces = new List <ChessPiece>();
if (copyExtra)
{
foreach (ChessPiece piece in boardToCopy.capturedPieces)
{
this.capturedPieces.Add(piece);
}
}
}
public void SetPiece(ChessPositionIndex index, ChessPieceType pieceType, ChessPieceColor pieceColor)
{
UInt64 pos = (UInt64)1 << (int)index;
if (pieceColor == ChessPieceColor.None)
{
SetEmpty(index);
}
else
{
ChessBoardColorState boardState = GetBoardState(pieceColor);
boardState.Pieces |= pos;
switch (pieceType)
{
case ChessPieceType.Pawn:
boardState.Pawns |= pos;
break;
case ChessPieceType.Knight:
boardState.Knights |= pos;
break;
case ChessPieceType.Bishop:
boardState.Bishops |= pos;
break;
case ChessPieceType.Rook:
boardState.Rooks |= pos;
break;
case ChessPieceType.Queen:
boardState.Queens |= pos;
break;
case ChessPieceType.King:
boardState.King |= pos;
break;
}
}
}
public void ApplyMove(ChessPieceColor color, ChessMove move, ChessMoveInfo moveInfo)
{
// Make the move...
ulong fromPos = Precomputed.IndexToBitBoard[(int)move.FromIndex];
ulong toPos = Precomputed.IndexToBitBoard[(int)move.ToIndex];
ulong capturePos = toPos;
if (moveInfo != null)
{
moveInfo.MovedBy = color;
}
count50MoveRule++;
ChessBoardColorState boardState = GetBoardState(color);
boardState.Pieces &= ~fromPos; // Move the piece.
boardState.Pieces |= toPos; // Move the piece.
switch (move.PieceType)
{
case ChessPieceType.Pawn:
count50MoveRule = 0;
boardState.Pawns &= ~fromPos;
switch (move.PromotionPieceType)
{
case ChessPieceType.Knight:
boardState.Knights |= toPos;
break;
case ChessPieceType.Bishop:
boardState.Bishops |= toPos;
break;
case ChessPieceType.Rook:
boardState.Rooks |= toPos;
break;
case ChessPieceType.Queen:
boardState.Queens |= toPos;
break;
default:
boardState.Pawns |= toPos;
break;
}
if (color == ChessPieceColor.White)
{
if ((Precomputed.WhitePawnCaptureMoves[(int)move.FromIndex] & toPos & (enPassantTarget << 8)) != 0)
{
capturePos = enPassantTarget;
enPassantTarget = 0;
}
else if ((Precomputed.WhitePawnDoubleMoves[(int)move.FromIndex] & toPos) != 0)
{
enPassantTarget = toPos;
}
else
{
enPassantTarget = 0;
}
}
else
{
if ((Precomputed.BlackPawnCaptureMoves[(int)move.FromIndex] & toPos & (enPassantTarget >> 8)) != 0)
{
capturePos = enPassantTarget;
enPassantTarget = 0;
}
else if ((Precomputed.BlackPawnDoubleMoves[(int)move.FromIndex] & toPos) != 0)
{
enPassantTarget = toPos;
}
else
{
enPassantTarget = 0;
}
}
break;
case ChessPieceType.Knight:
enPassantTarget = 0;
boardState.Knights &= ~fromPos;
boardState.Knights |= toPos;
break;
case ChessPieceType.Bishop:
enPassantTarget = 0;
boardState.Bishops &= ~fromPos;
boardState.Bishops |= toPos;
break;
case ChessPieceType.Rook:
enPassantTarget = 0;
boardState.Rooks &= ~fromPos;
boardState.Rooks |= toPos;
if ((fromPos & Precomputed.IndexToBitBoard[(int)ChessPositionIndex.A1]) != 0)
{
whiteBoardState.QueensideCastlingPossible = false;
}
else if ((fromPos & Precomputed.IndexToBitBoard[(int)ChessPositionIndex.H1]) != 0)
{
whiteBoardState.KingsideCastlingPossible = false;
}
else if ((fromPos & Precomputed.IndexToBitBoard[(int)ChessPositionIndex.A8]) != 0)
{
blackBoardState.QueensideCastlingPossible = false;
}
else if ((fromPos & Precomputed.IndexToBitBoard[(int)ChessPositionIndex.H8]) != 0)
{
blackBoardState.KingsideCastlingPossible = false;
}
break;
case ChessPieceType.Queen:
enPassantTarget = 0;
boardState.Queens &= ~fromPos;
boardState.Queens |= toPos;
break;
case ChessPieceType.King:
enPassantTarget = 0;
boardState.King &= ~fromPos;
boardState.King |= toPos;
boardState.KingsideCastlingPossible = false;
boardState.QueensideCastlingPossible = false;
if (move.IsKingsideCastling)
{
if (color == ChessPieceColor.White)
{
MoveRookWhenCastling(color, ChessPositionIndex.H1, ChessPositionIndex.F1, moveInfo);
}
else
{
MoveRookWhenCastling(color, ChessPositionIndex.H8, ChessPositionIndex.F8, moveInfo);
}
}
else if (move.IsQueensideCastling)
{
if (color == ChessPieceColor.White)
{
MoveRookWhenCastling(color, ChessPositionIndex.A1, ChessPositionIndex.D1, moveInfo);
}
else
{
MoveRookWhenCastling(color, ChessPositionIndex.A8, ChessPositionIndex.D8, moveInfo);
}
}
break;
}
ChessPieceColor invertedColor = ChessGame.InvertColor(color);
ChessBoardColorState invertedBoardState = GetBoardState(invertedColor);
if ((invertedBoardState.Pieces & capturePos) != 0) // Check if there is a capture.
{
invertedBoardState.Pieces &= ~capturePos; // Remove the piece from all black pieces.
invertedBoardState.Pawns &= ~capturePos;
invertedBoardState.Knights &= ~capturePos;
invertedBoardState.Bishops &= ~capturePos;
invertedBoardState.Rooks &= ~capturePos;
invertedBoardState.Queens &= ~capturePos;
move.IsCapture = true;
count50MoveRule = 0;
if (moveInfo != null)
{
moveInfo.CapturedPiecePos = (ChessPositionIndex)Util.fastBitScanForward(capturePos);
}
// PP 2012-12-24: when a rook is captured, castling is no longer possible.
if ((capturePos & Precomputed.IndexToBitBoard[(int)ChessPositionIndex.A1]) != 0)
{
whiteBoardState.QueensideCastlingPossible = false;
}
else if ((capturePos & Precomputed.IndexToBitBoard[(int)ChessPositionIndex.H1]) != 0)
{
whiteBoardState.KingsideCastlingPossible = false;
}
else if ((capturePos & Precomputed.IndexToBitBoard[(int)ChessPositionIndex.A8]) != 0)
{
blackBoardState.QueensideCastlingPossible = false;
}
else if ((capturePos & Precomputed.IndexToBitBoard[(int)ChessPositionIndex.H8]) != 0)
{
blackBoardState.KingsideCastlingPossible = false;
}
}
}
private void InitBoardState()
{
this.whiteBoardState = new ChessBoardColorState();
this.blackBoardState = new ChessBoardColorState();
}