internal ChessPiece(bool white, PieceType type)
{
this.white = white;
this.type = type;
this.lastMove = 0;
this.lastSquare = new SquareCoordinates(-1, -1);
}
private ChessPiece(bool white, PieceType type, ushort lastMove, SquareCoordinates lastSquare)
{
this.white = white;
this.type = type;
this.lastMove = lastMove;
this.lastSquare = lastSquare;
}
internal static bool CanCastle(ChessBoard board, SquareCoordinates coord, Player p)
{
ChessPiece piece = board.GetPiece(coord);
if (piece != null && piece.IsA(PieceType.ROOK) && piece.IsFriendly(p.White) && piece.HasNotMoved())
{
SquareCoordinates kingSq = p.White ? new SquareCoordinates("E1") : new SquareCoordinates("E8");
piece = board.GetPiece(kingSq);
if (piece != null && piece.IsA(PieceType.KING) && piece.IsFriendly(p.White) && piece.HasNotMoved() && !KingInCheck(board, p))
{
if (coord.File == 0)
{
if (!board.WillPlaceKingInCheck(p, new SquareCoordinates[] { new SquareCoordinates(4, coord.Rank), new SquareCoordinates(0, coord.Rank) }, new SquareCoordinates[] { new SquareCoordinates(2, coord.Rank), new SquareCoordinates(3, coord.Rank) }))
{
for (int file = 1, rank = coord.Rank; file < 4; file++)
if (board.GetPiece(coord = new SquareCoordinates(file, rank)) != null || Attackers(board, coord, p.White, true).Length > 0)
return false;
return true;
}
}
else if (coord.File == 7)
{
if (!board.WillPlaceKingInCheck(p, new SquareCoordinates[] { new SquareCoordinates(4, coord.Rank), new SquareCoordinates(7, coord.Rank) }, new SquareCoordinates[] { new SquareCoordinates(6, coord.Rank), new SquareCoordinates(5, coord.Rank) }))
{
for (int file = 5, rank = coord.Rank; file < 7; file++)
if (board.GetPiece(coord = new SquareCoordinates(file, rank)) != null || Attackers(board, coord, p.White, true).Length > 0)
return false;
return true;
}
}
}
}
return false;
}
internal void MovePiece(PieceType type, SquareCoordinates from, SquareCoordinates to)
{
if (type != PieceType.KING)
{
pieces.Remove(from);
pieces.Add(to);
}
else
{
kingSquare = to;
}
}
internal static byte[] WritePromotion(SquareCoordinates coord, PieceType newType)
{
return new byte[] { ChessOpHeaders.PROMOTION, (byte)coord.File, (byte)coord.Rank, (byte)newType };
}
private Material[] GetMaterial()
{
List<SquareCoordinates> wPieces = new List<SquareCoordinates>(), bPieces = new List<SquareCoordinates>();
SquareCoordinates wKing = new SquareCoordinates(-1, -1), bKing = new SquareCoordinates(-1, -1);
ChessPiece piece;
for (int i = 0; i < 8; i++)
for (int j = 0; j < 8; j++)
if ((piece = pieces[i, j]) != null)
if (piece.White)
if (piece.IsA(PieceType.KING))
wKing = new SquareCoordinates(i, j);
else
wPieces.Add(new SquareCoordinates(i, j));
else
if (piece.IsA(PieceType.KING))
bKing = new SquareCoordinates(i, j);
else
bPieces.Add(new SquareCoordinates(i, j));
if (wKing.File == -1 && wKing.Rank == -1)
throw new ApplicationException("White king not found in save file.");
if (bKing.File == -1 && bKing.Rank == -1)
throw new ApplicationException("Black king not found in save file.");
return new Material[] { new Material(wPieces, wKing), new Material(bPieces, bKing) };
}
internal bool WillPlaceKingInCheck(Player p, SquareCoordinates[] fromSquares, SquareCoordinates[] toSquares)
{
SquareCoordinates king = p.Material.KingSquare;
ChessPiece[] overwrittenPieces = new ChessPiece[fromSquares.Length];
for (int i = 0; i < fromSquares.Length; i++)
{
SquareCoordinates from = fromSquares[i];
SquareCoordinates to = toSquares[i];
ChessPiece fromPiece = pieces[from.File, from.Rank];
overwrittenPieces[i] = pieces[to.File, to.Rank];
pieces[to.File, to.Rank] = fromPiece;
pieces[from.File, from.Rank] = null;
if (fromPiece.IsA(PieceType.KING) && fromPiece.IsFriendly(p.White))
king = to;
}
bool inCheck = GameLogic.KingInCheck(this, king, p.White);
for (int i = 0; i < fromSquares.Length; i++)
{
SquareCoordinates from = fromSquares[i];
SquareCoordinates to = toSquares[i];
ChessPiece fromPiece = pieces[to.File, to.Rank];
pieces[from.File, from.Rank] = fromPiece;
pieces[to.File, to.Rank] = overwrittenPieces[i];
}
return inCheck;
}
internal void UpdateLastMove(SquareCoordinates from, Move m, ChessPiece moved, ChessPiece taken)
{
moveLabel.Text = MoveRecorder.GetMoveNotation(from, m, moved, taken);
if (m.Overtaken)
WaitingPlayer().Material.Pieces.Remove(m.TakenPiece);
}
internal void HighlightSquare(SquareCoordinates coord, Color color)
{
highlightedSquares[coord] = color;
using (Graphics g = this.CreateGraphics())
{
ChangeSquareBorderColor(g, color, new BoardIndices(coord, whiteOnBottom));
}
}
internal void DrawPiece(SquareCoordinates coord, ChessPiece piece)
{
SetPiece(coord, piece);
using (Graphics g = this.CreateGraphics())
{
DrawPiece(g, new BoardIndices(coord, whiteOnBottom), piece.White, piece.Type);
}
}
private static SquareCoordinates EnPassant(ChessBoard board, SquareCoordinates moveTo, bool white)
{
if (white)
{
if (moveTo.Rank != 5)
return new SquareCoordinates(-1, -1);
ChessPiece pawn = board.GetPiece(new SquareCoordinates(moveTo.File, 4));
if (pawn == null || !pawn.IsA(PieceType.PAWN) || pawn.IsFriendly(white))
return new SquareCoordinates(-1, -1);
if (pawn.LastMove != board.CurrentMove - 1 || pawn.LastSquare != new SquareCoordinates(moveTo.File, 6))
return new SquareCoordinates(-1, -1);
return new SquareCoordinates(moveTo.File, moveTo.Rank - 1);
}
else
{
if (moveTo.Rank != 2)
return new SquareCoordinates(-1, -1);
ChessPiece pawn = board.GetPiece(new SquareCoordinates(moveTo.File, 3));
if (pawn == null || !pawn.IsA(PieceType.PAWN) || pawn.IsFriendly(white))
return new SquareCoordinates(-1, -1);
if (pawn.LastMove != board.CurrentMove - 1 || pawn.LastSquare != new SquareCoordinates(moveTo.File, 1))
return new SquareCoordinates(-1, -1);
return new SquareCoordinates(moveTo.File, moveTo.Rank + 1);
}
}
private static bool CanInterpose(ChessBoard board, SquareCoordinates from, SquareCoordinates to, Player p)
{
switch (board.GetPiece(from).Type)
{
case PieceType.PAWN:
return false; //if pawns cannot be captured, they cannot be blocked by friendly pieces!
case PieceType.KNIGHT:
return false; //if knights cannot be captured, they cannot be blocked by friendly pieces!
case PieceType.BISHOP:
if (from.File - to.File == from.Rank - to.Rank)
{
for (int file = Math.Min(from.File, to.File) + 1, rank = Math.Min(from.Rank, to.Rank) + 1; file < Math.Max(from.File, to.File); file++, rank++)
if (Attackers(board, new SquareCoordinates(file, rank), !p.White, false).Length > 0)
return true;
}
else if (from.File - to.File == -(from.Rank - to.Rank))
{
for (int file = Math.Min(from.File, to.File) + 1, rank = Math.Max(from.Rank, to.Rank) + 1; file < Math.Max(from.File, to.File) && rank < 8; file++, rank--)
if (Attackers(board, new SquareCoordinates(file, rank), !p.White, false).Length > 0)
return true;
}
return false;
case PieceType.ROOK:
if (from.File == to.File)
{
for (int file = from.File, rank = Math.Min(from.Rank, to.Rank) + 1; rank < Math.Max(from.Rank, to.Rank); rank++)
if (Attackers(board, new SquareCoordinates(file, rank), !p.White, false).Length > 0)
return true;
}
else if (from.Rank == to.Rank)
{
for (int file = Math.Min(from.File, to.File) + 1, rank = from.Rank; file < Math.Max(from.File, to.File); file++)
if (Attackers(board, new SquareCoordinates(file, rank), !p.White, false).Length > 0)
return true;
}
return false;
case PieceType.QUEEN:
if (from.File == to.File || from.Rank == to.Rank)
goto case PieceType.ROOK;
else if (Math.Abs(from.File - to.File) == Math.Abs(from.Rank - to.Rank))
goto case PieceType.BISHOP;
return false;
default:
return false;
}
}
private static SquareCoordinates[] Attackers(ChessBoard board, SquareCoordinates pieceLoc, bool pieceWhite, bool allowPawnDiagonal)
{
List<SquareCoordinates> attackingPieces = new List<SquareCoordinates>();
int file, rank;
ChessPiece existingPiece;
SquareCoordinates coord;
//go vertically/horizontally and see if there's an unblocked opponent queen or rook.
existingPiece = null;
coord = new SquareCoordinates(-1, -1);
for (file = pieceLoc.File + 1, rank = pieceLoc.Rank; file < 8 && (existingPiece = board.GetPiece((coord = new SquareCoordinates(file, rank)))) == null; file++) ;
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && (existingPiece.IsA(PieceType.ROOK) || existingPiece.IsA(PieceType.QUEEN)))
attackingPieces.Add(coord);
existingPiece = null;
coord = new SquareCoordinates(-1, -1);
for (file = pieceLoc.File - 1, rank = pieceLoc.Rank; file >= 0 && (existingPiece = board.GetPiece((coord = new SquareCoordinates(file, rank)))) == null; file--) ;
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && (existingPiece.IsA(PieceType.ROOK) || existingPiece.IsA(PieceType.QUEEN)))
attackingPieces.Add(coord);
existingPiece = null;
coord = new SquareCoordinates(-1, -1);
for (file = pieceLoc.File, rank = pieceLoc.Rank + 1; rank < 8 && (existingPiece = board.GetPiece((coord = new SquareCoordinates(file, rank)))) == null; rank++) ;
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && (existingPiece.IsA(PieceType.ROOK) || existingPiece.IsA(PieceType.QUEEN) || !allowPawnDiagonal && pieceWhite && rank - pieceLoc.Rank == 1 && existingPiece.IsA(PieceType.PAWN)))
attackingPieces.Add(coord);
existingPiece = null;
coord = new SquareCoordinates(-1, -1);
for (file = pieceLoc.File, rank = pieceLoc.Rank - 1; rank >= 0 && (existingPiece = board.GetPiece((coord = new SquareCoordinates(file, rank)))) == null; rank--) ;
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && (existingPiece.IsA(PieceType.ROOK) || existingPiece.IsA(PieceType.QUEEN) || !allowPawnDiagonal && !pieceWhite && pieceLoc.Rank - rank == 1 && existingPiece.IsA(PieceType.PAWN)))
attackingPieces.Add(coord);
//go diagonally and see if there's an unblocked opponent queen or bishop (or pawn if only one diagonal away).
existingPiece = null;
for (file = pieceLoc.File + 1, rank = pieceLoc.Rank + 1; file < 8 && rank < 8 && (existingPiece = board.GetPiece((coord = new SquareCoordinates(file, rank)))) == null; file++, rank++) ;
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && (existingPiece.IsA(PieceType.BISHOP) || existingPiece.IsA(PieceType.QUEEN) || allowPawnDiagonal && pieceWhite && file - pieceLoc.File == 1 && rank - pieceLoc.Rank == 1 && existingPiece.IsA(PieceType.PAWN)))
attackingPieces.Add(coord);
existingPiece = null;
for (file = pieceLoc.File + 1, rank = pieceLoc.Rank - 1; file < 8 && rank >= 0 && (existingPiece = board.GetPiece((coord = new SquareCoordinates(file, rank)))) == null; file++, rank--) ;
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && (existingPiece.IsA(PieceType.BISHOP) || existingPiece.IsA(PieceType.QUEEN) || allowPawnDiagonal && !pieceWhite && file - pieceLoc.File == 1 && pieceLoc.Rank - rank == 1 && existingPiece.IsA(PieceType.PAWN)))
attackingPieces.Add(coord);
existingPiece = null;
for (file = pieceLoc.File - 1, rank = pieceLoc.Rank + 1; file >= 0 && rank < 8 && (existingPiece = board.GetPiece((coord = new SquareCoordinates(file, rank)))) == null; file--, rank++) ;
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && (existingPiece.IsA(PieceType.BISHOP) || existingPiece.IsA(PieceType.QUEEN) || allowPawnDiagonal && pieceWhite && pieceLoc.File - file == 1 && rank - pieceLoc.Rank == 1 && existingPiece.IsA(PieceType.PAWN)))
attackingPieces.Add(coord);
existingPiece = null;
for (file = pieceLoc.File - 1, rank = pieceLoc.Rank - 1; file >= 0 && rank >= 0 && (existingPiece = board.GetPiece((coord = new SquareCoordinates(file, rank)))) == null; file--, rank--) ;
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && (existingPiece.IsA(PieceType.BISHOP) || existingPiece.IsA(PieceType.QUEEN) || allowPawnDiagonal && !pieceWhite && pieceLoc.File - file == 1 && pieceLoc.Rank - rank == 1 && existingPiece.IsA(PieceType.PAWN)))
attackingPieces.Add(coord);
//go through all 8 L-shapes and see if there's a knight in each (doesn't matter if another piece is in the way).
file = pieceLoc.File + 2;
rank = pieceLoc.Rank + 1;
if (file < 8 && rank < 8)
{
coord = new SquareCoordinates(file, rank);
existingPiece = board.GetPiece(coord);
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && existingPiece.IsA(PieceType.KNIGHT))
attackingPieces.Add(coord);
}
file = pieceLoc.File + 2;
rank = pieceLoc.Rank - 1;
if (file < 8 && rank >= 0)
{
coord = new SquareCoordinates(file, rank);
existingPiece = board.GetPiece(coord);
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && existingPiece.IsA(PieceType.KNIGHT))
attackingPieces.Add(coord);
}
file = pieceLoc.File + 1;
rank = pieceLoc.Rank + 2;
if (file < 8 && rank < 8)
{
coord = new SquareCoordinates(file, rank);
existingPiece = board.GetPiece(coord);
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && existingPiece.IsA(PieceType.KNIGHT))
attackingPieces.Add(coord);
}
file = pieceLoc.File + 1;
rank = pieceLoc.Rank - 2;
if (file < 8 && rank >= 0)
{
coord = new SquareCoordinates(file, rank);
existingPiece = board.GetPiece(coord);
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && existingPiece.IsA(PieceType.KNIGHT))
attackingPieces.Add(coord);
}
file = pieceLoc.File - 2;
rank = pieceLoc.Rank + 1;
if (file >= 0 && rank < 8)
{
coord = new SquareCoordinates(file, rank);
existingPiece = board.GetPiece(coord);
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && existingPiece.IsA(PieceType.KNIGHT))
attackingPieces.Add(coord);
}
file = pieceLoc.File - 2;
rank = pieceLoc.Rank - 1;
if (file >= 0 && rank >= 0)
{
coord = new SquareCoordinates(file, rank);
existingPiece = board.GetPiece(coord);
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && existingPiece.IsA(PieceType.KNIGHT))
attackingPieces.Add(coord);
}
file = pieceLoc.File - 1;
rank = pieceLoc.Rank + 2;
if (file >= 0 && rank < 8)
{
coord = new SquareCoordinates(file, rank);
existingPiece = board.GetPiece(coord);
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && existingPiece.IsA(PieceType.KNIGHT))
attackingPieces.Add(coord);
}
file = pieceLoc.File - 1;
rank = pieceLoc.Rank - 2;
if (file >= 0 && rank >= 0)
{
coord = new SquareCoordinates(file, rank);
existingPiece = board.GetPiece(coord);
if (existingPiece != null && !existingPiece.IsFriendly(pieceWhite) && existingPiece.IsA(PieceType.KNIGHT))
attackingPieces.Add(coord);
}
return attackingPieces.ToArray();
}
internal static MoveSet MoveSet(ChessBoard board, SquareCoordinates coord, Player p)
{
switch (board.GetPiece(coord).Type)
{
case PieceType.PAWN:
return PawnMoves(board, coord, p);
case PieceType.KNIGHT:
return KnightMoves(board, coord, p);
case PieceType.BISHOP:
return BishopMoves(board, coord, p);
case PieceType.ROOK:
return RookMoves(board, coord, p);
case PieceType.QUEEN:
return QueenMoves(board, coord, p);
case PieceType.KING:
return KingMoves(board, coord, p);
default:
return new MoveSet();
}
}
internal static bool KingInCheck(ChessBoard board, SquareCoordinates kingSquare, bool white)
{
return Attackers(board, kingSquare, white, true).Length != 0;
}
internal BoardIndices(SquareCoordinates coord, bool whiteOnBottom)
{
this.row = whiteOnBottom ? (7 - coord.Rank) : coord.Rank;
this.col = whiteOnBottom ? coord.File : (7 - coord.File);
}
internal ChessPiece ClearSquare(SquareCoordinates coord)
{
ChessPiece removed = GetPiece(coord);
SetPiece(coord, null);
using (Graphics g = this.CreateGraphics())
{
DrawSquare(g, new BoardIndices(coord, whiteOnBottom));
}
return removed;
}
private static MoveSet KnightMoves(ChessBoard board, SquareCoordinates coord, Player p)
{
List<Move> allowedMoves = new List<Move>();
List<SquareCoordinates> movesWithCheck = new List<SquareCoordinates>();
List<SquareCoordinates> blockedMoves = new List<SquareCoordinates>();
bool boardOrientation = board.WhiteOnBottom;
bool white = p.White;
//SquareCoordinates opponentEnPassantPawn;
ChessPiece existingPiece;
Move m;
int nextFile, nextRank;
ProcessSquare proc = delegate(SquareCoordinates to)
{
if ((existingPiece = board.GetPiece(to)) == null)
/*if ((opponentEnPassantPawn = EnPassant(board, to, p.White)).File != -1 && opponentEnPassantPawn.Rank != -1)
if (!board.WillPlaceKingInCheck(p, coord, m = new Move(to, opponentEnPassantPawn)))
allowedMoves.Add(m);
else
movesWithCheck.Add(to);
else*/
if (!board.WillPlaceKingInCheck(p, coord, m = new Move(to)))
allowedMoves.Add(m);
else
movesWithCheck.Add(to);
else if (!existingPiece.IsFriendly(p.White))
if (!board.WillPlaceKingInCheck(p, coord, m = new Move(to, to)))
allowedMoves.Add(m);
else
movesWithCheck.Add(to);
else
blockedMoves.Add(to);
};
nextFile = coord.File + 1;
if (nextFile < 8)
{
nextRank = coord.Rank + 2;
//check if we are in bounds and that either no piece exists there, or the piece is not a friendly
if (nextRank < 8)
proc(new SquareCoordinates(nextFile, nextRank)); //right 1 up 2
nextRank = coord.Rank - 2;
//check if we are in bounds and that either no piece exists there, or the piece is not a friendly
if (nextRank >= 0)
proc(new SquareCoordinates(nextFile, nextRank)); //right 1 down 2
}
nextFile = coord.File + 2;
if (nextFile < 8)
{
nextRank = coord.Rank + 1;
//check if we are in bounds and that either no piece exists there, or the piece is not a friendly
if (nextRank < 8)
proc(new SquareCoordinates(nextFile, nextRank)); //right 2 up 1
nextRank = coord.Rank - 1;
//check if we are in bounds and that either no piece exists there, or the piece is not a friendly
if (nextRank >= 0)
proc(new SquareCoordinates(nextFile, nextRank)); //right 2 down 1
}
nextFile = coord.File - 1;
if (nextFile >= 0)
{
nextRank = coord.Rank + 2;
//check if we are in bounds and that either no piece exists there, or the piece is not a friendly
if (nextRank < 8)
proc(new SquareCoordinates(nextFile, nextRank)); //left 1 up 2
nextRank = coord.Rank - 2;
//check if we are in bounds and that either no piece exists there, or the piece is not a friendly
if (nextRank >= 0)
proc(new SquareCoordinates(nextFile, nextRank)); //left 1 down 2
}
nextFile = coord.File - 2;
if (nextFile >= 0)
{
nextRank = coord.Rank + 1;
//check if we are in bounds and that either no piece exists there, or the piece is not a friendly
if (nextRank < 8)
proc(new SquareCoordinates(nextFile, nextRank)); //left 2 up 1
nextRank = coord.Rank - 1;
//check if we are in bounds and that either no piece exists there, or the piece is not a friendly
if (nextRank >= 0)
proc(new SquareCoordinates(nextFile, nextRank)); //left 2 down 1
}
return new MoveSet(allowedMoves, movesWithCheck, blockedMoves);
}
internal ChessPiece GetPiece(SquareCoordinates coord)
{
return pieces[coord.File, coord.Rank];
}
//TODO: promotion (pawn reaching opponent's end of board -> any piece)
private static MoveSet PawnMoves(ChessBoard board, SquareCoordinates coord, Player p)
{
List<Move> allowedMoves = new List<Move>();
List<SquareCoordinates> movesWithCheck = new List<SquareCoordinates>();
List<SquareCoordinates> blockedMoves = new List<SquareCoordinates>();
bool boardOrientation = board.WhiteOnBottom;
bool white = p.White;
SquareCoordinates nextSquare;
ChessPiece existingPiece;
Move m;
int nextRank, nextFile;
//check if piece would go out of bounds
if (white && (nextRank = coord.Rank + 1) < 8 || !white && (nextRank = coord.Rank - 1) >= 0)
{
nextSquare = new SquareCoordinates(coord.File, nextRank);
existingPiece = board.GetPiece(nextSquare);
if (existingPiece == null)
//move up 1 if no piece is in that space
if (!board.WillPlaceKingInCheck(p, coord, m = new Move(nextSquare)))
allowedMoves.Add(m);
else
movesWithCheck.Add(nextSquare);
else
blockedMoves.Add(nextSquare);
//diagonal take
SquareCoordinates opponentEnPassantPawn;
ProcessSquare diagonalProc = delegate(SquareCoordinates to)
{
if ((existingPiece = board.GetPiece(to)) != null)
{
if (!existingPiece.IsFriendly(white))
if (!board.WillPlaceKingInCheck(p, coord, m = new Move(to, to)))
allowedMoves.Add(m);
else
movesWithCheck.Add(to);
}
else if ((opponentEnPassantPawn = EnPassant(board, to, p.White)).File != -1 && opponentEnPassantPawn.Rank != -1)
{
if (!board.WillPlaceKingInCheck(p, coord, m = new Move(to, opponentEnPassantPawn)))
allowedMoves.Add(m);
else
movesWithCheck.Add(nextSquare);
}
};
nextFile = coord.File + 1;
//check if we are in bounds and that either no piece exists there, or the piece is not a friendly
if (nextFile < 8)
diagonalProc(new SquareCoordinates(nextFile, nextRank)); //move diagonally up right if an opponent piece is in that space
nextFile = coord.File - 1;
//check if we are in bounds and that either no piece exists there, or the piece is not a friendly
if (nextFile >= 0)
diagonalProc(new SquareCoordinates(nextFile, nextRank)); //move diagonally up left if an opponent piece is in that space
}
//check if we are still in the home position
if (white && (nextRank = coord.Rank + 2) == 3 || !white && (nextRank = coord.Rank - 2) == 4)
{
nextSquare = new SquareCoordinates(coord.File, nextRank);
SquareCoordinates betweenSquare = new SquareCoordinates(coord.File, (nextRank + coord.Rank) / 2);
existingPiece = board.GetPiece(nextSquare);
ChessPiece betweenPiece = board.GetPiece(betweenSquare);
if (existingPiece == null && betweenPiece == null)
//move up 2 spaces if no piece is at that space and no piece is in between
if (!board.WillPlaceKingInCheck(p, coord, m = new Move(nextSquare)))
allowedMoves.Add(m);
else
movesWithCheck.Add(nextSquare);
else
blockedMoves.Add(nextSquare);
}
return new MoveSet(allowedMoves, movesWithCheck, blockedMoves);
}
internal void UnhighlightSquare(SquareCoordinates coord)
{
highlightedSquares.Remove(coord);
using (Graphics g = this.CreateGraphics())
{
ChangeSquareBorderColor(g, BackColor, new BoardIndices(coord, whiteOnBottom));
}
}
private static MoveSet QueenMoves(ChessBoard board, SquareCoordinates coord, Player p)
{
//Queen's allowed moves are basically a combination of those of rook (diagonals) and bishop (vertical/horizontal)
//so just call the methods to get rook and bishop moves and return a union of them
return new MoveSet(RookMoves(board, coord, p), BishopMoves(board, coord, p));
}
internal bool WillPlaceKingInCheck(Player p, SquareCoordinates from, Move move)
{
//temporarily moves a piece from the square 'from' to the square 'to'
//without showing it on the board, and checks GameLogic to see if we are in check.
//no matter the result, the board will be restored right afterwards.
//perhaps just create a copy of the board so we don't have to restore the old pieces?
SquareCoordinates to = move.Coordinates;
SquareCoordinates taken = move.TakenPiece;
ChessPiece fromPiece = pieces[from.File, from.Rank];
ChessPiece takenPiece = pieces[taken.File, taken.Rank];
pieces[taken.File, taken.Rank] = null;
pieces[to.File, to.Rank] = fromPiece;
pieces[from.File, from.Rank] = null;
bool movedKing = fromPiece.IsA(PieceType.KING) && fromPiece.White == p.White;
bool inCheck = GameLogic.KingInCheck(this, movedKing ? to : p.Material.KingSquare, p.White);
pieces[from.File, from.Rank] = fromPiece;
pieces[to.File, to.Rank] = null;
pieces[taken.File, taken.Rank] = takenPiece;
return inCheck;
}
private static MoveSet RookMoves(ChessBoard board, SquareCoordinates coord, Player p)
{
List<Move> allowedMoves = new List<Move>();
List<SquareCoordinates> movesWithCheck = new List<SquareCoordinates>();
List<SquareCoordinates> blockedMoves = new List<SquareCoordinates>();
bool boardOrientation = board.WhiteOnBottom;
bool white = p.White;
SquareCoordinates nextSquare/*, opponentEnPassantPawn*/;
Move m;
int nextFile, nextRank;
ProcessSquare linearProc = delegate(SquareCoordinates to)
{
/*if ((opponentEnPassantPawn = EnPassant(board, to, p.White)).File != -1 && opponentEnPassantPawn.Rank != -1)
if (!board.WillPlaceKingInCheck(p, coord, m = new Move(to, opponentEnPassantPawn)))
allowedMoves.Add(m);
else
movesWithCheck.Add(to);
else*/
if (!board.WillPlaceKingInCheck(p, coord, m = new Move(to)))
allowedMoves.Add(m);
else
movesWithCheck.Add(to);
};
ProcessSquare blockingPieceProc = delegate(SquareCoordinates to)
{
if (!board.GetPiece(to).IsFriendly(white))
if (!board.WillPlaceKingInCheck(p, coord, m = new Move(to, to)))
allowedMoves.Add(m);
else
movesWithCheck.Add(to);
else
blockedMoves.Add(to);
};
nextFile = coord.File;
nextRank = coord.Rank;
while (++nextFile < 8 && board.GetPiece(nextSquare = new SquareCoordinates(nextFile, nextRank)) == null)
linearProc(nextSquare);
//we stop the loop if we encounter any piece, or if we start going out of bounds off the board.
//if we did not stop at the edge of the board, check to see if the piece we stopped at is an opponent piece. if it is, we can move there as well
if (nextFile < 8)
blockingPieceProc(new SquareCoordinates(nextFile, nextRank));
nextFile = coord.File;
nextRank = coord.Rank;
while (++nextRank < 8 && board.GetPiece(nextSquare = new SquareCoordinates(nextFile, nextRank)) == null)
linearProc(nextSquare);
//we stop the loop if we encounter any piece, or if we start going out of bounds off the board.
//if we did not stop at the edge of the board, check to see if the piece we stopped at is an opponent piece. if it is, we can move there as well
if (nextRank < 8)
blockingPieceProc(new SquareCoordinates(nextFile, nextRank));
nextFile = coord.File;
nextRank = coord.Rank;
while (--nextFile >= 0 && board.GetPiece(nextSquare = new SquareCoordinates(nextFile, nextRank)) == null)
linearProc(nextSquare);
//we stop the loop if we encounter any piece, or if we start going out of bounds off the board.
//if we did not stop at the edge of the board, check to see if the piece we stopped at is an opponent piece. if it is, we can move there as well
if (nextFile >= 0)
blockingPieceProc(new SquareCoordinates(nextFile, nextRank));
nextFile = coord.File;
nextRank = coord.Rank;
while (--nextRank >= 0 && board.GetPiece(nextSquare = new SquareCoordinates(nextFile, nextRank)) == null)
linearProc(nextSquare);
//we stop the loop if we encounter any piece, or if we start going out of bounds off the board.
//if we did not stop at the edge of the board, check to see if the piece we stopped at is an opponent piece. if it is, we can move there as well
if (nextRank >= 0)
blockingPieceProc(new SquareCoordinates(nextFile, nextRank));
return new MoveSet(allowedMoves, movesWithCheck, blockedMoves);
}
protected override void MouseClicked(object sender, MouseEventArgs e)
{
int x = e.X, y = e.Y;
int leftBound = LEFT_PAD + BORDER_WIDTH, rightBound = LEFT_PAD + 8 * (SQUARE_LENGTH + BORDER_WIDTH);
int topBound = TOP_PAD + BORDER_WIDTH, bottomBound = TOP_PAD + 8 * (SQUARE_LENGTH + BORDER_WIDTH);
if (x >= leftBound && x <= rightBound &&
y >= topBound && y <= bottomBound)
{
x -= leftBound;
y -= topBound;
int row = y / (SQUARE_LENGTH + BORDER_WIDTH);
int col = x / (SQUARE_LENGTH + BORDER_WIDTH);
int subX = x - col * (SQUARE_LENGTH + BORDER_WIDTH), subY = y - row * (SQUARE_LENGTH + BORDER_WIDTH);
//if we're not in a border (space b/w two squares), then select the piece
if (subX < ChessBoard.SQUARE_LENGTH && subY < ChessBoard.SQUARE_LENGTH)
{
SquareCoordinates coord = new SquareCoordinates(whiteOnBottom, new BoardIndices(row, col));
if (e.Button == MouseButtons.Left)
{
if (turn == Turn.LOCAL_WHITE)
whitePlayer.Select(this, coord);
else if (turn == Turn.LOCAL_BLACK)
blackPlayer.Select(this, coord);
}
else if (e.Button == MouseButtons.Right)
{
if (turn == Turn.LOCAL_WHITE)
{
if (GameLogic.CanCastle(this, coord, whitePlayer))
{
castleContextMenu.Visible = true;
castleKingside = (coord.File == 7);
}
}
else if (turn == Turn.LOCAL_BLACK)
{
if (GameLogic.CanCastle(this, coord, blackPlayer))
{
castleContextMenu.Visible = true;
castleKingside = (coord.File == 7);
}
}
}
}
}
}
internal Move(SquareCoordinates moveTo)
{
coord = moveTo;
overtaken = false;
}
private Material[] SetDefaultPieces()
{
//reset all pieces in case we played on this board before
ClearAllSquares();
List<SquareCoordinates> wPieces = new List<SquareCoordinates>(15), bPieces = new List<SquareCoordinates>(15);
SquareCoordinates wKing, bKing;
SquareCoordinates coord;
SetPiece(coord = new SquareCoordinates("A1"), new ChessPiece(true, PieceType.ROOK));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("B1"), new ChessPiece(true, PieceType.KNIGHT));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("C1"), new ChessPiece(true, PieceType.BISHOP));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("D1"), new ChessPiece(true, PieceType.QUEEN));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("E1"), new ChessPiece(true, PieceType.KING));
wKing = coord;
SetPiece(coord = new SquareCoordinates("F1"), new ChessPiece(true, PieceType.BISHOP));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("G1"), new ChessPiece(true, PieceType.KNIGHT));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("H1"), new ChessPiece(true, PieceType.ROOK));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("A2"), new ChessPiece(true, PieceType.PAWN));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("B2"), new ChessPiece(true, PieceType.PAWN));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("C2"), new ChessPiece(true, PieceType.PAWN));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("D2"), new ChessPiece(true, PieceType.PAWN));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("E2"), new ChessPiece(true, PieceType.PAWN));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("F2"), new ChessPiece(true, PieceType.PAWN));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("G2"), new ChessPiece(true, PieceType.PAWN));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("H2"), new ChessPiece(true, PieceType.PAWN));
wPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("A8"), new ChessPiece(false, PieceType.ROOK));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("B8"), new ChessPiece(false, PieceType.KNIGHT));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("C8"), new ChessPiece(false, PieceType.BISHOP));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("D8"), new ChessPiece(false, PieceType.QUEEN));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("E8"), new ChessPiece(false, PieceType.KING));
bKing = coord;
SetPiece(coord = new SquareCoordinates("F8"), new ChessPiece(false, PieceType.BISHOP));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("G8"), new ChessPiece(false, PieceType.KNIGHT));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("H8"), new ChessPiece(false, PieceType.ROOK));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("A7"), new ChessPiece(false, PieceType.PAWN));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("B7"), new ChessPiece(false, PieceType.PAWN));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("C7"), new ChessPiece(false, PieceType.PAWN));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("D7"), new ChessPiece(false, PieceType.PAWN));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("E7"), new ChessPiece(false, PieceType.PAWN));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("F7"), new ChessPiece(false, PieceType.PAWN));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("G7"), new ChessPiece(false, PieceType.PAWN));
bPieces.Add(coord);
SetPiece(coord = new SquareCoordinates("H7"), new ChessPiece(false, PieceType.PAWN));
bPieces.Add(coord);
return new Material[] { new Material(wPieces, wKing), new Material(bPieces, bKing) };
}
internal Move(SquareCoordinates moveTo, SquareCoordinates overtake)
{
coord = moveTo;
this.overtaken = true;
takePiece = overtake;
}
internal static byte[] WriteSelectSquare(SquareCoordinates coord)
{
return new byte[] { ChessOpHeaders.SELECT_SQUARE, (byte)coord.File, (byte)coord.Rank };
}
private void SetPiece(SquareCoordinates coord, ChessPiece piece)
{
pieces[coord.File, coord.Rank] = piece;
}