private static void AnalyzeMovePawn(Board board, byte dstPos, Piece pcMoving)
{
//Because Pawns only kill diagonaly we handle the En Passant scenario specialy
if (board.EnPassantPosition > 0)
{
if (pcMoving.PieceColor != board.EnPassantColor)
{
if (board.EnPassantPosition == dstPos)
{
//We have an En Passant Possible
pcMoving.ValidMoves.Push(dstPos);
if (pcMoving.PieceColor == ChessPieceColor.White)
{
WhiteAttackBoard[dstPos] = true;
}
else
{
BlackAttackBoard[dstPos] = true;
}
}
}
}
Piece pcAttacked = board.Squares[dstPos].Piece;
//If there no piece there I can potentialy kill
if (pcAttacked == null)
return;
//Regardless of what is there I am attacking this square
if (pcMoving.PieceColor == ChessPieceColor.White)
{
WhiteAttackBoard[dstPos] = true;
//if that piece is the same color
if (pcAttacked.PieceColor == pcMoving.PieceColor)
{
pcAttacked.DefendedValue += pcMoving.PieceActionValue;
return;
}
pcAttacked.AttackedValue += pcMoving.PieceActionValue;
//If this is a king set it in check
if (pcAttacked.PieceType == ChessPieceType.King)
{
board.BlackCheck = true;
}
else
{
//Add this as a valid move
pcMoving.ValidMoves.Push(dstPos);
}
}
else
{
BlackAttackBoard[dstPos] = true;
//if that piece is the same color
if (pcAttacked.PieceColor == pcMoving.PieceColor)
{
pcAttacked.DefendedValue += pcMoving.PieceActionValue;
return;
}
pcAttacked.AttackedValue += pcMoving.PieceActionValue;
//If this is a king set it in check
if (pcAttacked.PieceType == ChessPieceType.King)
{
board.WhiteCheck = true;
}
else
{
//Add this as a valid move
pcMoving.ValidMoves.Push(dstPos);
}
}
return;
}
private static void CheckValidMovesPawn(List<byte> moves, Piece pcMoving, byte srcPosition,
Board board, byte count)
{
for (byte i = 0; i < count; i++)
{
byte dstPos = moves[i];
if (dstPos%8 != srcPosition%8)
{
//If there is a piece there I can potentialy kill
AnalyzeMovePawn(board, dstPos, pcMoving);
if (pcMoving.PieceColor == ChessPieceColor.White)
{
WhiteAttackBoard[dstPos] = true;
}
else
{
BlackAttackBoard[dstPos] = true;
}
}
// if there is something if front pawns can't move there
else if (board.Squares[dstPos].Piece != null)
{
return;
}
//if there is nothing in front of me (blocked == false)
else
{
pcMoving.ValidMoves.Push(dstPos);
}
}
}
internal static void GenerateValidMoves(Board board)
{
// Reset Board
board.BlackCheck = false;
board.WhiteCheck = false;
WhiteAttackBoard = new bool[64];
BlackAttackBoard = new bool[64];
//Generate Moves
for (byte x = 0; x < 64; x++)
{
Square sqr = board.Squares[x];
if (sqr.Piece == null)
continue;
sqr.Piece.ValidMoves = new Stack<byte>(sqr.Piece.LastValidMoveCount);
switch (sqr.Piece.PieceType)
{
case ChessPieceType.Pawn:
{
if (sqr.Piece.PieceColor == ChessPieceColor.White)
{
CheckValidMovesPawn(MoveArrays.WhitePawnMoves[x].Moves, sqr.Piece, x,
board,
MoveArrays.WhitePawnTotalMoves[x]);
break;
}
if (sqr.Piece.PieceColor == ChessPieceColor.Black)
{
CheckValidMovesPawn(MoveArrays.BlackPawnMoves[x].Moves, sqr.Piece, x,
board,
MoveArrays.BlackPawnTotalMoves[x]);
break;
}
break;
}
case ChessPieceType.Knight:
{
for (byte i = 0; i < MoveArrays.KnightTotalMoves[x]; i++)
{
AnalyzeMove(board, MoveArrays.KnightMoves[x].Moves[i], sqr.Piece);
}
break;
}
case ChessPieceType.Bishop:
{
for (byte i = 0; i < MoveArrays.BishopTotalMoves1[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.BishopMoves1[x].Moves[i],
sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.BishopTotalMoves2[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.BishopMoves2[x].Moves[i],
sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.BishopTotalMoves3[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.BishopMoves3[x].Moves[i],
sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.BishopTotalMoves4[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.BishopMoves4[x].Moves[i],
sqr.Piece) ==
false)
{
break;
}
}
break;
}
case ChessPieceType.Rook:
{
for (byte i = 0; i < MoveArrays.RookTotalMoves1[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.RookMoves1[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.RookTotalMoves2[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.RookMoves2[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.RookTotalMoves3[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.RookMoves3[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.RookTotalMoves4[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.RookMoves4[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
break;
}
case ChessPieceType.Queen:
{
for (byte i = 0; i < MoveArrays.QueenTotalMoves1[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.QueenMoves1[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.QueenTotalMoves2[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.QueenMoves2[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.QueenTotalMoves3[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.QueenMoves3[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.QueenTotalMoves4[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.QueenMoves4[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.QueenTotalMoves5[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.QueenMoves5[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.QueenTotalMoves6[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.QueenMoves6[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.QueenTotalMoves7[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.QueenMoves7[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
for (byte i = 0; i < MoveArrays.QueenTotalMoves8[x]; i++)
{
if (
AnalyzeMove(board, MoveArrays.QueenMoves8[x].Moves[i], sqr.Piece) ==
false)
{
break;
}
}
break;
}
case ChessPieceType.King:
{
if (sqr.Piece.PieceColor == ChessPieceColor.White)
{
whiteKingPosition = x;
}
else
{
blackKingPosition = x;
}
break;
}
}
}
if (board.WhoseMove == ChessPieceColor.White)
{
GenerateValidMovesKing(board.Squares[blackKingPosition].Piece, board,
blackKingPosition);
GenerateValidMovesKing(board.Squares[whiteKingPosition].Piece, board,
whiteKingPosition);
}
else
{
GenerateValidMovesKing(board.Squares[whiteKingPosition].Piece, board,
whiteKingPosition);
GenerateValidMovesKing(board.Squares[blackKingPosition].Piece, board,
blackKingPosition);
}
//Now that all the pieces were examined we know if the king is in check
GenerateValidMovesKingCastle(board, board.Squares[whiteKingPosition].Piece);
GenerateValidMovesKingCastle(board, board.Squares[blackKingPosition].Piece);
}
private static bool AnalyzeMove(Board board, byte dstPos, Piece pcMoving)
{
//If I am not a pawn everywhere I move I can attack
if (pcMoving.PieceColor == ChessPieceColor.White)
{
WhiteAttackBoard[dstPos] = true;
}
else
{
BlackAttackBoard[dstPos] = true;
}
//If there no piece there I can potentialy kill just add the move and exit
if (board.Squares[dstPos].Piece == null)
{
pcMoving.ValidMoves.Push(dstPos);
return true;
}
Piece pcAttacked = board.Squares[dstPos].Piece;
//if that piece is a different color
if (pcAttacked.PieceColor != pcMoving.PieceColor)
{
pcAttacked.AttackedValue += pcMoving.PieceActionValue;
//If this is a king set it in check
if (pcAttacked.PieceType == ChessPieceType.King)
{
if (pcAttacked.PieceColor == ChessPieceColor.Black)
{
board.BlackCheck = true;
}
else
{
board.WhiteCheck = true;
}
}
else
{
//Add this as a valid move
pcMoving.ValidMoves.Push(dstPos);
}
//We don't continue movement past this piece
return false;
}
//Same Color I am defending
pcAttacked.DefendedValue += pcMoving.PieceActionValue;
//Since this piece is of my kind I can't move there
return false;
}
public static bool SearchForMate(ChessPieceColor movingSide, Board examineBoard, ref bool blackMate, ref bool whiteMate, ref bool staleMate)
{
bool foundNonCheckBlack = false;
bool foundNonCheckWhite = false;
for (byte x = 0; x < 64; x++)
{
Square sqr = examineBoard.Squares[x];
//Make sure there is a piece on the square
if (sqr.Piece == null)
continue;
//Make sure the color is the same color as the one we are moving.
if (sqr.Piece.PieceColor != movingSide)
continue;
//For each valid move for this piece
foreach (byte dst in sqr.Piece.ValidMoves)
{
//We make copies of the board and move so we don't change the original
Board board = examineBoard.FastCopy();
//Make move so we can examine it
Board.MovePiece(board, x, dst, ChessPieceType.Queen);
//We Generate Valid Moves for Board
PieceValidMoves.GenerateValidMoves(board);
if (board.BlackCheck == false)
{
foundNonCheckBlack = true;
}
else if (movingSide == ChessPieceColor.Black)
{
continue;
}
if (board.WhiteCheck == false)
{
foundNonCheckWhite = true;
}
else if (movingSide == ChessPieceColor.White)
{
continue;
}
}
}
if (foundNonCheckBlack == false)
{
if (examineBoard.BlackCheck)
{
blackMate = true;
return true;
}
if (!examineBoard.WhiteMate && movingSide != ChessPieceColor.White)
{
staleMate = true;
return true;
}
}
if (foundNonCheckWhite == false)
{
if (examineBoard.WhiteCheck)
{
whiteMate = true;
return true;
}
if (!examineBoard.BlackMate && movingSide != ChessPieceColor.Black)
{
staleMate = true;
return true;
}
}
return false;
}
/*
* Parse the board to the FEN
*/
private static string Fen(bool boardOnly, Board board)
{
string output = String.Empty;
byte blankSquares = 0;
for (byte x = 0; x < 64; x++)
{
byte index = x;
if (board.Squares[index].Piece != null)
{
if (blankSquares > 0)
{
output += blankSquares.ToString();
blankSquares = 0;
}
if (board.Squares[index].Piece.PieceColor == ChessPieceColor.Black)
{
output += Piece.GetPieceTypeShort(board.Squares[index].Piece.PieceType).ToLower();
}
else
{
output += Piece.GetPieceTypeShort(board.Squares[index].Piece.PieceType);
}
}
else
{
blankSquares++;
}
if (x % 8 == 7)
{
if (blankSquares > 0)
{
output += blankSquares.ToString();
output += "/";
blankSquares = 0;
}
else
{
if (x > 0 && x != 63)
{
output += "/";
}
}
}
}
if (board.WhoseMove == ChessPieceColor.White)
{
output += " w ";
}
else
{
output += " b ";
}
string spacer = "";
if (board.WhiteCastled == false)
{
if (board.Squares[60].Piece != null)
{
if (board.Squares[60].Piece.Moved == false)
{
if (board.Squares[63].Piece != null)
{
if (board.Squares[63].Piece.Moved == false)
{
output += "K";
spacer = " ";
}
}
if (board.Squares[56].Piece != null)
{
if (board.Squares[56].Piece.Moved == false)
{
output += "Q";
spacer = " ";
}
}
}
}
}
if (board.BlackCastled == false)
{
if (board.Squares[4].Piece != null)
{
if (board.Squares[4].Piece.Moved == false)
{
if (board.Squares[7].Piece != null)
{
if (board.Squares[7].Piece.Moved == false)
{
output += "k";
spacer = " ";
}
}
if (board.Squares[0].Piece != null)
{
if (board.Squares[0].Piece.Moved == false)
{
output += "q";
spacer = " ";
}
}
}
}
}
if (output.EndsWith("/"))
{
output.TrimEnd('/');
}
if (board.EnPassantPosition != 0)
{
output += spacer + GetColumnFromByte((byte)(board.EnPassantPosition % 8)) + "" + (byte)(8 - (byte)(board.EnPassantPosition / 8)) + " ";
}
else
{
output += spacer + "- ";
}
if (!boardOnly)
{
output += board.FiftyMove + " ";
output += board.MoveCount + 1;
}
return output.Trim();
}
private static void RecordEnPassant(ChessPieceColor pcColor, ChessPieceType pcType, Board board, byte srcPosition, byte dstPosition)
{
//Record En Passant if Pawn Moving
if (pcType == ChessPieceType.Pawn)
{
//Reset FiftyMoveCount if pawn moved
board.FiftyMove = 0;
int difference = srcPosition - dstPosition;
if (difference == 16 || difference == -16)
{
board.EnPassantPosition = (byte)(dstPosition + (difference / 2));
board.EnPassantColor = pcColor;
}
}
}
private void InitiateBoard(string fen)
{
HumanPlayer = ChessPieceColor.White;
ChessBoard = new Board(fen);
// ChessBoard.WhoseMove = ChessPieceColor.White;
PieceMoves.InitiateChessPieceMotion();
GenerateValidMoves();
}
private static void KingCastle(Board board, Piece piece, byte srcPosition, byte dstPosition)
{
if (piece.PieceType != ChessPieceType.King)
{
return;
}
//Lets see if this is a casteling move.
if (piece.PieceColor == ChessPieceColor.White && srcPosition == 60)
{
//Castle Right
if (dstPosition == 62)
{
//Ok we are casteling we need to move the Rook
if (board.Squares[63].Piece != null)
{
board.Squares[61].Piece = board.Squares[63].Piece;
board.Squares[63].Piece = null;
board.WhiteCastled = true;
board.LastMove.MovingPieceSecondary = new PieceMoving(board.Squares[61].Piece.PieceColor, board.Squares[61].Piece.PieceType, board.Squares[61].Piece.Moved, 63, 61);
board.Squares[61].Piece.Moved = true;
return;
}
}
//Castle Left
else if (dstPosition == 58)
{
//Ok we are casteling we need to move the Rook
if (board.Squares[56].Piece != null)
{
board.Squares[59].Piece = board.Squares[56].Piece;
board.Squares[56].Piece = null;
board.WhiteCastled = true;
board.LastMove.MovingPieceSecondary = new PieceMoving(board.Squares[59].Piece.PieceColor, board.Squares[59].Piece.PieceType, board.Squares[59].Piece.Moved, 56, 59);
board.Squares[59].Piece.Moved = true;
return;
}
}
}
else if (piece.PieceColor == ChessPieceColor.Black && srcPosition == 4)
{
if (dstPosition == 6)
{
//Ok we are casteling we need to move the Rook
if (board.Squares[7].Piece != null)
{
board.Squares[5].Piece = board.Squares[7].Piece;
board.Squares[7].Piece = null;
board.BlackCastled = true;
board.LastMove.MovingPieceSecondary = new PieceMoving(board.Squares[5].Piece.PieceColor, board.Squares[5].Piece.PieceType, board.Squares[5].Piece.Moved, 7, 5);
board.Squares[5].Piece.Moved = true;
return;
}
}
//Castle Left
else if (dstPosition == 2)
{
//Ok we are casteling we need to move the Rook
if (board.Squares[0].Piece != null)
{
board.Squares[3].Piece = board.Squares[0].Piece;
board.Squares[0].Piece = null;
board.BlackCastled = true;
board.LastMove.MovingPieceSecondary = new PieceMoving(board.Squares[3].Piece.PieceColor, board.Squares[3].Piece.PieceType, board.Squares[3].Piece.Moved, 0, 3);
board.Squares[3].Piece.Moved = true;
return;
}
}
}
return;
}
private static bool PromotePawns(Board board, Piece piece, byte dstPosition, ChessPieceType promoteToPiece)
{
if (piece.PieceType == ChessPieceType.Pawn)
{
if (dstPosition < 8)
{
board.Squares[dstPosition].Piece.PieceType = promoteToPiece;
return true;
}
if (dstPosition > 55)
{
board.Squares[dstPosition].Piece.PieceType = promoteToPiece;
return true;
}
}
return false;
}
//Fast Copy
internal Board FastCopy()
{
Board clonedBoard = new Board(Squares);
clonedBoard.EndGamePhase = EndGamePhase;
clonedBoard.WhoseMove = WhoseMove;
clonedBoard.MoveCount = MoveCount;
clonedBoard.FiftyMove = FiftyMove;
clonedBoard.ZobristHash = ZobristHash;
clonedBoard.BlackCastled = BlackCastled;
clonedBoard.WhiteCastled = WhiteCastled;
return clonedBoard;
}
internal static MoveContent MovePiece(Board board, byte srcPosition, byte dstPosition, ChessPieceType promoteToPiece)
{
Piece piece = board.Squares[srcPosition].Piece;
//Record my last move
board.LastMove = new MoveContent();
//Add One to FiftyMoveCount to check for tie.
board.FiftyMove++;
if (piece.PieceColor == ChessPieceColor.Black)
{
board.MoveCount++;
}
//En Passant
if (board.EnPassantPosition > 0)
{
board.LastMove.EnPassantOccured = SetEnpassantMove(board, dstPosition, piece.PieceColor);
}
if (!board.LastMove.EnPassantOccured)
{
Square sqr = board.Squares[dstPosition];
if (sqr.Piece != null)
{
board.LastMove.TakenPiece = new PieceTaken(sqr.Piece.PieceColor, sqr.Piece.PieceType,
sqr.Piece.Moved, dstPosition);
board.FiftyMove = 0;
}
else
{
board.LastMove.TakenPiece = new PieceTaken(ChessPieceColor.White, ChessPieceType.None, false,
dstPosition);
}
}
board.LastMove.MovingPiecePrimary = new PieceMoving(piece.PieceColor, piece.PieceType, piece.Moved, srcPosition, dstPosition);
//Delete the piece in its source position
board.Squares[srcPosition].Piece = null;
//Add the piece to its new position
piece.Moved = true;
piece.Selected = false;
board.Squares[dstPosition].Piece = piece;
//Reset EnPassantPosition
board.EnPassantPosition = 0;
//Record En Passant if Pawn Moving
if (piece.PieceType == ChessPieceType.Pawn)
{
board.FiftyMove = 0;
RecordEnPassant(piece.PieceColor, piece.PieceType, board, srcPosition, dstPosition);
}
board.WhoseMove = board.WhoseMove == ChessPieceColor.White ? ChessPieceColor.Black : ChessPieceColor.White;
KingCastle(board, piece, srcPosition, dstPosition);
//Promote Pawns
if (PromotePawns(board, piece, dstPosition, promoteToPiece))
{
board.LastMove.PawnPromoted = true;
}
else
{
board.LastMove.PawnPromoted = false;
}
if ( board.FiftyMove >= 50)
{
board.StaleMate = true;
}
return board.LastMove;
}
//Copy Constructor
internal Board(Board board)
{
Squares = new Square[64];
for (byte x = 0; x < 64; x++)
{
if (board.Squares[x].Piece != null)
{
Squares[x] = new Square(board.Squares[x].Piece);
}
}
EndGamePhase = board.EndGamePhase;
FiftyMove = board.FiftyMove;
RepeatedMove = board.RepeatedMove;
WhiteCastled = board.WhiteCastled;
BlackCastled = board.BlackCastled;
BlackCheck = board.BlackCheck;
WhiteCheck = board.WhiteCheck;
StaleMate = board.StaleMate;
WhiteMate = board.WhiteMate;
BlackMate = board.BlackMate;
WhoseMove = board.WhoseMove;
EnPassantPosition = board.EnPassantPosition;
EnPassantColor = board.EnPassantColor;
ZobristHash = board.ZobristHash;
Score = board.Score;
LastMove = new MoveContent(board.LastMove);
MoveCount = board.MoveCount;
}
private static void GenerateValidMovesKing(Piece piece, Board board, byte srcPosition)
{
if (piece == null)
{
return;
}
for (byte i = 0; i < MoveArrays.KingTotalMoves[srcPosition]; i++)
{
byte dstPos = MoveArrays.KingMoves[srcPosition].Moves[i];
if (piece.PieceColor == ChessPieceColor.White)
{
//I can't move where I am being attacked
if (BlackAttackBoard[dstPos])
{
WhiteAttackBoard[dstPos] = true;
continue;
}
}
else
{
if (WhiteAttackBoard[dstPos])
{
BlackAttackBoard[dstPos] = true;
continue;
}
}
AnalyzeMove(board, dstPos, piece);
}
}
private static bool SetEnpassantMove(Board board, byte dstPosition, ChessPieceColor pcColor)
{
//En Passant
if (board.EnPassantPosition == dstPosition)
{
//We have an En Passant Possible
if (pcColor != board.EnPassantColor)
{
int pieceLocationOffset = 8;
if (board.EnPassantColor == ChessPieceColor.White)
{
pieceLocationOffset = -8;
}
dstPosition = (byte)(dstPosition + pieceLocationOffset);
Square sqr = board.Squares[dstPosition];
board.LastMove.TakenPiece = new PieceTaken(sqr.Piece.PieceColor, sqr.Piece.PieceType, sqr.Piece.Moved, dstPosition);
board.Squares[dstPosition].Piece = null;
//Reset FiftyMoveCount if capture
board.FiftyMove = 0;
return true;
}
}
return false;
}
private static void GenerateValidMovesKingCastle(Board board, Piece king)
{
if (king == null)
{
return;
}
if (king.Moved)
{
return;
}
if (king.PieceColor == ChessPieceColor.White &&
board.WhiteCastled)
{
return;
}
if (king.PieceColor == ChessPieceColor.Black &&
board.BlackCastled)
{
return;
}
if (king.PieceColor == ChessPieceColor.Black &&
board.BlackCheck)
{
return;
}
if (king.PieceColor == ChessPieceColor.White &&
board.WhiteCheck)
{
return;
}
//This code will add the castleling move to the pieces available moves
if (king.PieceColor == ChessPieceColor.White)
{
if (board.WhiteCheck)
{
return;
}
if (board.Squares[63].Piece != null)
{
//Check if the Right Rook is still in the correct position
if (board.Squares[63].Piece.PieceType == ChessPieceType.Rook)
{
if (board.Squares[63].Piece.PieceColor == king.PieceColor)
{
//Move one column to right see if its empty
if (board.Squares[62].Piece == null)
{
if (board.Squares[61].Piece == null)
{
if (BlackAttackBoard[61] == false &&
BlackAttackBoard[62] == false)
{
//Ok looks like move is valid lets add it
king.ValidMoves.Push(62);
WhiteAttackBoard[62] = true;
}
}
}
}
}
}
if (board.Squares[56].Piece != null)
{
//Check if the Left Rook is still in the correct position
if (board.Squares[56].Piece.PieceType == ChessPieceType.Rook)
{
if (board.Squares[56].Piece.PieceColor == king.PieceColor)
{
//Move one column to right see if its empty
if (board.Squares[57].Piece == null)
{
if (board.Squares[58].Piece == null)
{
if (board.Squares[59].Piece == null)
{
if (BlackAttackBoard[58] == false &&
BlackAttackBoard[59] == false)
{
//Ok looks like move is valid lets add it
king.ValidMoves.Push(58);
WhiteAttackBoard[58] = true;
}
}
}
}
}
}
}
}
else if (king.PieceColor == ChessPieceColor.Black)
{
if (board.BlackCheck)
{
return;
}
//There are two ways to castle, scenario 1:
if (board.Squares[7].Piece != null)
{
//Check if the Right Rook is still in the correct position
if (board.Squares[7].Piece.PieceType == ChessPieceType.Rook
&& !board.Squares[7].Piece.Moved)
{
if (board.Squares[7].Piece.PieceColor == king.PieceColor)
{
//Move one column to right see if its empty
if (board.Squares[6].Piece == null)
{
if (board.Squares[5].Piece == null)
{
if (WhiteAttackBoard[5] == false && WhiteAttackBoard[6] == false)
{
//Ok looks like move is valid lets add it
king.ValidMoves.Push(6);
BlackAttackBoard[6] = true;
}
}
}
}
}
}
//There are two ways to castle, scenario 2:
if (board.Squares[0].Piece != null)
{
//Check if the Left Rook is still in the correct position
if (board.Squares[0].Piece.PieceType == ChessPieceType.Rook &&
!board.Squares[0].Piece.Moved)
{
if (board.Squares[0].Piece.PieceColor ==
king.PieceColor)
{
//Move one column to right see if its empty
if (board.Squares[1].Piece == null)
{
if (board.Squares[2].Piece == null)
{
if (board.Squares[3].Piece == null)
{
if (WhiteAttackBoard[2] == false &&
WhiteAttackBoard[3] == false)
{
//Ok looks like move is valid lets add it
king.ValidMoves.Push(2);
BlackAttackBoard[2] = true;
}
}
}
}
}
}
}
}
}
public bool MovePiece(byte sourceColumn, byte sourceRow, byte destinationColumn, byte destinationRow)
{
byte srcPosition = (byte)(sourceColumn + (sourceRow * 8));
byte dstPosition = (byte)(destinationColumn + (destinationRow * 8));
Piece piece = ChessBoard.Squares[srcPosition].Piece;
PreviousChessBoard = new Board(ChessBoard);
Board.MovePiece(ChessBoard, srcPosition, dstPosition, ChessPieceType.Queen);
PieceValidMoves.GenerateValidMoves(ChessBoard);
//If there is a check in place, check if this is still true;
if (piece.PieceColor == ChessPieceColor.White)
{
if (ChessBoard.WhiteCheck)
{
//Invalid Move
ChessBoard = new Board(PreviousChessBoard);
PieceValidMoves.GenerateValidMoves(ChessBoard);
return false;
}
}
else if (piece.PieceColor == ChessPieceColor.Black)
{
if (ChessBoard.BlackCheck)
{
//Invalid Move
ChessBoard = new Board(PreviousChessBoard);
PieceValidMoves.GenerateValidMoves(ChessBoard);
return false;
}
}
return true;
}