public void CopyFrom(ChessBoard source)
{
for (int row = 0; row < 8; row++)
{
for (int col = 0; col < 8; col++)
{
board[row, col] = source.board[row, col];
}
}
flags = source.flags;
pawnJumpCol = source.pawnJumpCol;
}
private void CheckForCheck()
{
flags &= ~(BoardFlags.BlackInCheck | BoardFlags.WhiteInCheck);
for (int row = 0; row < 8; row++)
{
for (int col = 0; col < 8; col++)
{
Coordinate source = new Coordinate(row, col);
PieceColor sourceColor = PieceColorAt(source);
if ((this[row, col] == ChessPiece.King) && IsUnderAttack(new Coordinate(row, col), PieceColor.Black))
{
flags |= BoardFlags.WhiteInCheck;
}
if ((this[row, col] == ChessPiece.BlackKing) && IsUnderAttack(new Coordinate(row, col), PieceColor.White))
{
flags |= BoardFlags.BlackInCheck;
}
}
}
}
private void ApplyMove(ChessMove move)
{
bool isBlack = PieceColorAt(move.Source) == PieceColor.Black;
if (IsBlacksTurn)
{
if (!isBlack)
{
throw new InvalidOperationException("Attempted to move a white piece on black's turn");
}
}
else
{
if (isBlack)
{
throw new InvalidOperationException("Attempted to move a black piece on white's turn");
}
}
switch (this[move.Source] & ChessPiece.PieceMask)
{
case ChessPiece.Pawn:
if ((move.Source.col != move.Target.col) && ((this[move.Target] & ChessPiece.PieceMask) == ChessPiece.Empty))
{
// En Passant
if (isBlack)
{
board[move.Target.row - 1, move.Target.col] = ChessPiece.Empty;
}
else
{
board[move.Target.row + 1, move.Target.col] = ChessPiece.Empty;
}
}
if ((move.Target.row - move.Source.row > 1) || (move.Source.row - move.Target.row > 1))
{
pawnJumpCol = move.Source.col;
}
else
{
pawnJumpCol = 99;
}
break;
case ChessPiece.Rook:
if (move.Source.col == 0)
{
flags |= BoardFlags.WhiteQueenSideCastlingEnded;
}
else
{
flags |= BoardFlags.WhiteKingSideCastlingEnded;
}
pawnJumpCol = 99;
break;
case ChessPiece.BlackRook:
if (move.Source.col == 0)
{
flags |= BoardFlags.BlackQueenSideCastlingEnded;
}
else
{
flags |= BoardFlags.BlackKingSideCastlingEnded;
}
pawnJumpCol = 99;
break;
case ChessPiece.King:
if (isBlack)
{
flags |= BoardFlags.BlackKingSideCastlingEnded | BoardFlags.BlackQueenSideCastlingEnded;
}
else
{
flags |= BoardFlags.WhiteKingSideCastlingEnded | BoardFlags.WhiteQueenSideCastlingEnded;
}
if (move.Target.col - move.Source.col > 1)
{
// Castling to king's rook
board[move.Source.row, 5] = board[move.Source.row, 7];
board[move.Source.row, 7] = ChessPiece.Empty;
}
else if (move.Source.col - move.Target.col > 1)
{
// Castling to queen's rook
board[move.Source.row, 3] = board[move.Source.row, 0];
board[move.Source.row, 0] = ChessPiece.Empty;
}
pawnJumpCol = 99;
break;
case ChessPiece.Empty:
throw new InvalidOperationException("Attempted to move from a square without a piece.");
default:
pawnJumpCol = 99;
break;
}
if ((isBlack && (move.Target.row == 7) && (board[move.Source.row, move.Source.col] == ChessPiece.BlackPawn)) ||
(!isBlack && (move.Target.row == 0) && (board[move.Source.row, move.Source.col] == ChessPiece.Pawn)))
{
board[move.Target.row, move.Target.col] = move.Promotion | (isBlack ? ChessPiece.Black : 0);
}
else
{
board[move.Target.row, move.Target.col] = board[move.Source.row, move.Source.col];
}
board[move.Source.row, move.Source.col] = ChessPiece.Empty;
flags ^= BoardFlags.BlacksTurn;
CheckForCheck();
}
private void CheckForCheck()
{
flags &= ~(BoardFlags.BlackInCheck | BoardFlags.WhiteInCheck);
for (int row = 0; row < 8; row++)
for (int col = 0; col < 8; col++)
{
Coordinate source = new Coordinate(row, col);
PieceColor sourceColor = PieceColorAt(source);
if ((this[row, col] == ChessPiece.King) && IsUnderAttack(new Coordinate(row, col), PieceColor.Black))
flags |= BoardFlags.WhiteInCheck;
if ((this[row, col] == ChessPiece.BlackKing) && IsUnderAttack(new Coordinate(row, col), PieceColor.White))
flags |= BoardFlags.BlackInCheck;
}
}
private void ApplyMove(ChessMove move)
{
bool isBlack = PieceColorAt(move.Source) == PieceColor.Black;
if (IsBlacksTurn)
{
if (!isBlack)
throw new InvalidOperationException("Attempted to move a white piece on black's turn");
}
else
{
if (isBlack)
throw new InvalidOperationException("Attempted to move a black piece on white's turn");
}
switch (this[move.Source] & ChessPiece.PieceMask)
{
case ChessPiece.Pawn:
if ((move.Source.col != move.Target.col) && ((this[move.Target] & ChessPiece.PieceMask) == ChessPiece.Empty))
{
// En Passant
if (isBlack)
board[move.Target.row - 1, move.Target.col] = ChessPiece.Empty;
else
board[move.Target.row + 1, move.Target.col] = ChessPiece.Empty;
}
if ((move.Target.row - move.Source.row > 1) || (move.Source.row - move.Target.row > 1))
pawnJumpCol = move.Source.col;
else
pawnJumpCol = 99;
break;
case ChessPiece.Rook:
if (move.Source.col == 0)
flags |= BoardFlags.WhiteQueenSideCastlingEnded;
else flags |= BoardFlags.WhiteKingSideCastlingEnded;
pawnJumpCol = 99;
break;
case ChessPiece.BlackRook:
if (move.Source.col == 0)
flags |= BoardFlags.BlackQueenSideCastlingEnded;
else flags |= BoardFlags.BlackKingSideCastlingEnded;
pawnJumpCol = 99;
break;
case ChessPiece.King:
if (isBlack)
flags |= BoardFlags.BlackKingSideCastlingEnded | BoardFlags.BlackQueenSideCastlingEnded;
else
flags |= BoardFlags.WhiteKingSideCastlingEnded | BoardFlags.WhiteQueenSideCastlingEnded;
if (move.Target.col - move.Source.col > 1)
{
// Castling to king's rook
board[move.Source.row, 5] = board[move.Source.row, 7];
board[move.Source.row, 7] = ChessPiece.Empty;
}
else if (move.Source.col - move.Target.col > 1)
{
// Castling to queen's rook
board[move.Source.row, 3] = board[move.Source.row, 0];
board[move.Source.row, 0] = ChessPiece.Empty;
}
pawnJumpCol = 99;
break;
case ChessPiece.Empty:
throw new InvalidOperationException("Attempted to move from a square without a piece.");
default:
pawnJumpCol = 99;
break;
}
if ((isBlack && (move.Target.row == 7) && (board[move.Source.row, move.Source.col] == ChessPiece.BlackPawn))
|| (!isBlack && (move.Target.row == 0) && (board[move.Source.row, move.Source.col] == ChessPiece.Pawn)))
board[move.Target.row, move.Target.col] = move.Promotion | (isBlack ? ChessPiece.Black : 0);
else
board[move.Target.row, move.Target.col] = board[move.Source.row, move.Source.col];
board[move.Source.row, move.Source.col] = ChessPiece.Empty;
flags ^= BoardFlags.BlacksTurn;
CheckForCheck();
}
public void CopyFrom(ChessBoard source)
{
for (int row = 0; row < 8; row++)
for (int col = 0; col < 8; col++)
{
board[row, col] = source.board[row, col];
}
flags = source.flags;
pawnJumpCol = source.pawnJumpCol;
}
