public Piece(Piece piece)
{
this.type = piece.getType();
this.color = piece.getColor();
this.position = piece.getPosition();
this.numberOfMoves = piece.numberOfMoves;
}
public Piece(Piece piece)
{
this.type = piece.getType();
this.color = piece.getColor();
this.position = piece.getPosition();
this.numberOfMoves = piece.numberOfMoves;
}
public static Dictionary <Position, bool?> validMoves(Piece toBeMoved)
{
Dictionary <Position, bool?> moves = new Dictionary <Position, bool?>();
for (int x = 0; x < 8; ++x)
{
for (int y = 0; y < 8; ++y)
{
Position to = new Position(x, y);
Piece moveTo = board.at(to);
bool? valid = Rules.validMove(toBeMoved, to);
if (valid == true && moveTo.getType() != "blank")
{
valid = null;
}
if (valid != false)
{
move(toBeMoved.getPosition(), moveTo.getPosition(), false);
if (IsChecked(toBeMoved.getColor()))
{
valid = false;
}
undo();
}
moves.Add(to, valid);
}
}
return(moves);
}
public static bool validMove(Piece p, Position to)
{
if (p.getPosition().Equals(to))
{
return(false);
}
String type = p.getType();
switch (type)
{
case "pawn":
return(pawnValid(p, p.getPosition(), to));
case "knight":
return(knightValid(p, p.getPosition(), to));
case "bishop":
return(bishopValid(p, p.getPosition(), to));
case "rook":
return(rookValid(p, p.getPosition(), to));
case "queen":
return(queenValid(p, p.getPosition(), to));
case "king":
return(kingValid(p, p.getPosition(), to));
default:
return(false);
}
}
private static bool kingValid(Piece p, Position from, Position to)
{
int xDist = to.x - from.x;
int yDist = to.y - from.y;
//Check for valid castling
if (p.numberOfMoves == 0 && yDist == 0 && (xDist == 2 || xDist == -2))
{
int direction = xDist == 2 ? 1 : -2;
Piece p2 = Chess.board.at(new Position(to.x + direction, from.y));
if (Chess.IsSame(p, p2.getPosition()) && p2.getType() == "rook" && p2.numberOfMoves == 0 && !Chess.IsChecked(p.getColor()))
{
return(rookValid(p, from, to));
}
}
if (!((xDist * xDist) <= 1 && (yDist * yDist) <= 1))
{
return(false);
}
return(!Chess.IsSame(p, to));
}
public static bool validMove(Piece p, Position to)
{
if (p.getPosition().Equals(to)) return false;
String type = p.getType();
switch (type)
{
case "pawn":
return pawnValid(p, p.getPosition(), to);
case "knight":
return knightValid(p, p.getPosition(), to);
case "bishop":
return bishopValid(p, p.getPosition(), to);
case "rook":
return rookValid(p, p.getPosition(), to);
case "queen":
return queenValid(p, p.getPosition(), to);
case "king":
return kingValid(p, p.getPosition(), to);
default:
return false;
}
}
private static void move(Position from, Position to, bool realMove)
{
lastMove = new ChessMove(from, to);
Piece p1 = board.at(from);
Piece p2 = board.at(to);
pieceRemoved = p2;
int xDiff = to.x - from.x;
if (p1.getType() == "king" && Math.Abs(xDiff) > 1 && realMove)
{
int xDir = xDiff < 0 ? -2 : 1;
Position rook = new Position(to.x + xDir, to.y);
xDir = xDiff < 0 ? 1 : -1;
board.at(rook).debug();
move(rook, new Position(to.x + xDir, to.y));
}
board.set(from, new Piece("blank", "none", from));
p1.numberOfMoves++;
if (p1.getType() == "pawn" && Math.Abs(to.y - from.y) == 2)
{
p1.numberOfMoves++;
}
p1.setPosition(to);
if (p1.getType() == "pawn" && (to.y == 0 || to.y == 7))
{
p1 = new Piece("queen", p1.getColor(), p1.getPosition(), p1.getNumberOfMoves());
}
board.set(to, p1);
}
public static Dictionary<Position, bool?> validMoves(Piece toBeMoved)
{
Dictionary<Position, bool?> moves = new Dictionary<Position, bool?>();
for (int x = 0; x < 8; ++x)
{
for (int y = 0; y < 8; ++y)
{
Position to = new Position(x, y);
Piece moveTo = board.at(to);
bool? valid = Rules.validMove(toBeMoved, to);
if (valid == true && moveTo.getType() != "blank")
{
valid = null;
}
if (valid != false)
{
move(toBeMoved.getPosition(), moveTo.getPosition(), false);
if (IsChecked(toBeMoved.getColor()))
{
valid = false;
}
undo();
}
moves.Add(to, valid);
}
}
return moves;
}
public static ChessMove nextDraw()
{
ChessMove finalMove = new ChessMove(new Position(0, 0), new Position(0, 0));
Random rnd = new Random();
double best = -10000;
List <Piece> blackPieces = Chess.blackPieces();
foreach (Piece piece in blackPieces)
{
Piece p = blackPieces.Find(x => x.Equals(piece));
Dictionary <Position, bool?> moves = Chess.validMoves(p);
foreach (KeyValuePair <Position, bool?> move in moves)
{
double value = 0;
if (move.Value != false)
{
value = Chess.board.at(move.Key).getValue() + rnd.NextDouble() * 4;
if (isThreatened(p.getPosition()))
{
value += p.getValue();
if (isProtected(p.getPosition()))
{
int low = lowestThreathener(p.getPosition(), "white");
int val = p.getValue();
value -= low < val ? low : val;
}
}
int previousValue = p.getValue();
Chess.tempMove(p.getPosition(), move.Key);
value += p.getValue() - previousValue;
if (isThreatened(p.getPosition()))
{
value -= p.getValue();
if (isProtected(p.getPosition()))
{
int low = lowestThreathener(p.getPosition(), "white");
int val = p.getValue();
value += low < val ? low : val;
}
}
if (Chess.IsChecked("white"))
{
value += rnd.NextDouble() * 5;
}
Chess.undo();
}
else if (move.Value == false)
{
value = -10000;
}
if (value > best)
{
best = value;
finalMove = new ChessMove(piece.getPosition(), move.Key);
}
}
}
return(finalMove);
}
