public move(piece p, square s)
{
movablePiece = p;
targetSquare = s;
}
//function that handles end of turn and calculation of the new turn
//called after a player has made his move => switch sides
//TODO
private void endTurn()
{
var colorDark = Color.DarkGray;
var colorLight = Color.White;
var colorSelected = Color.OrangeRed;
var colorMovable = Color.DarkSeaGreen;
turnCount++;
//change turn owner
if (turn == "white")
{
turn = "black";
}
else
{
turn = "white";
}
legalMoves = new List <move>();
//this handles the mask calculation
masks.calculateCheckers();
//deselect piece and reset the board colors
selectedPiece = null;
foreach (square s in squareArray)
{
Panel workingPanel = _chessBoardPanels[s.xPosition, s.yPosition];
if ((workingPanel.Location.X / tileSize) % 2 == 0)
{
workingPanel.BackColor = (workingPanel.Location.Y / tileSize) % 2 != 0 ? colorDark : colorLight;
}
else
{
workingPanel.BackColor = (workingPanel.Location.Y / tileSize) % 2 != 0 ? colorLight : colorDark;
}
}
//calculate new move list
pins.calculatePins();
core.calculateMoves();
//conditions for end of the game
if (legalMoves.Count == 0 && masks.checkerCount == 0)
{
//game ends in a draw
gameOver("draw");
}
else if (legalMoves.Count == 0 && masks.checkerCount > 0)
{
//the opponent wins
if (turn == "white")
{
gameOver("black");
}
else
{
gameOver("white");
}
}
//uncomment for debugging of masks - currently works(maybe?)
/*for(int i = 0; i < 8; i++)
* {
* for(int j = 0; j < 8; j++)
* {
* if (masks.kingDangerMask[i, j]) _chessBoardPanels[i, j].BackColor = Color.Blue;
* }
* }*/
}
public square(int x, int y)
{
this.xPosition = x;
this.yPosition = y;
here = null;
}
//TODO
//handler of the player clicking a square on the board
private void boardClickHandler(object sender, EventArgs e)
{
var colorDark = Color.DarkGray;
var colorLight = Color.White;
var colorSelected = Color.OrangeRed;
var colorMovable = Color.DarkSeaGreen;
Panel clickedPanel = (Panel)sender;
//the piece the player tried to click (can be null! = clicked an empty square)
piece clickedPiece = squareArray[clickedPanel.Location.X / tileSize, clickedPanel.Location.Y / tileSize].here;
square clickedSquare = squareArray[clickedPanel.Location.X / tileSize, clickedPanel.Location.Y / tileSize];
//selecting squares works
//TODO - check for present pieces
//TODO - check of other selected squares - global variable?
//dummy for debugging the game board - uncomment to use
/*if(clickedPanel.BackColor == colorSelected)
* {
* if ((clickedPanel.Location.X / tileSize) % 2 == 0)
* clickedPanel.BackColor = (clickedPanel.Location.Y / tileSize) % 2 != 0 ? colorDark : colorLight;
* else
* clickedPanel.BackColor = (clickedPanel.Location.Y / tileSize) % 2 != 0 ? colorLight : colorDark;
* }
* else clickedPanel.BackColor = colorSelected;*/
//if it's the first turn of the game, end turn to evaluate moves for pieces
if (firstMove)
{
firstMove = false;
endTurn();
if (board.mode == "Play versus A.I." && turn != playerfaction)
{
move aiMove = ai_core.getMove();
//simulate the ai clicking on the board to make the move
boardClickHandler(_chessBoardPanels[aiMove.movablePiece.xPosition, aiMove.movablePiece.yPosition], null);
boardClickHandler(_chessBoardPanels[aiMove.targetSquare.xPosition, aiMove.targetSquare.yPosition], null);
}
}
if (clickedPiece == null && selectedPiece == null) //player clicked meaninglessly
{
//do nothing
}
//the player attempted to select a piece while not having one selected
else if (selectedPiece == null) //clicked piece can NOT be null
{
if (clickedPiece.pieceColor == turn) //the player clicked his own piece (selected)
{
selectedPiece = clickedPiece;
movableSquares = new List <square>();
foreach (move m in legalMoves)
{
if (m.movablePiece == selectedPiece)
{
movableSquares.Add(m.targetSquare);
}
}
//update the gameboard with movable squares (in green)
_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].BackColor = colorSelected;
foreach (square s in movableSquares)
{
_chessBoardPanels[s.xPosition, s.yPosition].BackColor = colorMovable;
}
}
//else do nothing - the player tried to select the enemy piece
}
//the player attempted to deselect a piece
else if ((clickedPiece == null && !(movableSquares.Contains(clickedSquare))) || (clickedPiece == selectedPiece))
{
//deselect the selected piece
if ((_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].Location.X / tileSize) % 2 == 0)
{
_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].BackColor = (_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].Location.Y / tileSize) % 2 != 0 ? colorDark : colorLight;
}
else
{
_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].BackColor = (_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].Location.Y / tileSize) % 2 != 0 ? colorLight : colorDark;
}
selectedPiece = null;
//update the board to deselect the pieces in color
foreach (square s in movableSquares)
{
Panel workingPanel = _chessBoardPanels[s.xPosition, s.yPosition];
if ((workingPanel.Location.X / tileSize) % 2 == 0)
{
workingPanel.BackColor = (workingPanel.Location.Y / tileSize) % 2 != 0 ? colorDark : colorLight;
}
else
{
workingPanel.BackColor = (workingPanel.Location.Y / tileSize) % 2 != 0 ? colorLight : colorDark;
}
}
movableSquares = null;
}
//the player selected one of his other pieces while having one selected already
else if (selectedPiece != null && clickedPiece != null && clickedPiece.pieceColor == turn)
{
//deselect the selected piece
if ((_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].Location.X / tileSize) % 2 == 0)
{
_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].BackColor = (_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].Location.Y / tileSize) % 2 != 0 ? colorDark : colorLight;
}
else
{
_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].BackColor = (_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].Location.Y / tileSize) % 2 != 0 ? colorLight : colorDark;
}
selectedPiece = null;
//update the board to deselect the pieces in color
foreach (square s in movableSquares)
{
Panel workingPanel = _chessBoardPanels[s.xPosition, s.yPosition];
if ((workingPanel.Location.X / tileSize) % 2 == 0)
{
workingPanel.BackColor = (workingPanel.Location.Y / tileSize) % 2 != 0 ? colorDark : colorLight;
}
else
{
workingPanel.BackColor = (workingPanel.Location.Y / tileSize) % 2 != 0 ? colorLight : colorDark;
}
}
movableSquares = null;
//now select the new piece
selectedPiece = clickedPiece;
movableSquares = new List <square>();
foreach (move m in legalMoves)
{
if (m.movablePiece == selectedPiece)
{
movableSquares.Add(m.targetSquare);
}
}
//update the gameboard with movable squares (in green)
_chessBoardPanels[selectedPiece.xPosition, selectedPiece.yPosition].BackColor = colorSelected;
foreach (square s in movableSquares)
{
_chessBoardPanels[s.xPosition, s.yPosition].BackColor = colorMovable;
}
}
//the player performed a move (or a take)
else if (selectedPiece != null && movableSquares.Contains(clickedSquare))
{
selectedPiece.move(clickedSquare);
endTurn();
//handler for the A.I. to make a move
if (board.mode == "Play versus A.I." && turn != playerfaction)
{
move aiMove = ai_core.getMove();
//simulate the ai clicking on the board to make the move
boardClickHandler(_chessBoardPanels[aiMove.movablePiece.xPosition, aiMove.movablePiece.yPosition], null);
boardClickHandler(_chessBoardPanels[aiMove.targetSquare.xPosition, aiMove.targetSquare.yPosition], null);
}
}
}
public static void calculateMoves()
{
//king moves are calculated first - if there is a double check, the rest doesn't need to be calculated
piece playerKing = null;
if (board.turn == "white")
{
playerKing = board.whitePieces.Find(p => p.pieceType == "king");
}
else
{
playerKing = board.blackPieces.Find(p => p.pieceType == "king");
}
bool currentPinned = false; pin currentPin = null;
List <square> kingSquares = playerKing.getLegalMoves();
foreach (square s in kingSquares)
{
board.legalMoves.Add(new move(playerKing, s));
}
//double check - only legal moves are to move the king
if (masks.checkerCount >= 2)
{
return;
}
//single check - can move, block or capture checker
//TODO: pinned pieces
else if (masks.checkerCount == 1)
{
List <piece> pcs = null;
if (board.turn == "white")
{
pcs = board.whitePieces;
}
else
{
pcs = board.blackPieces;
}
List <square> consideredMoves = null;
foreach (piece p in pcs)
{
//if the piece is pinned, give it special treatment
if (pins.existingPins.Exists(pi => pi.pinnedPiece == p))
{
currentPinned = true;
currentPin = pins.existingPins.Find(pi => pi.pinnedPiece == p);
}
consideredMoves = p.getLegalMoves();
foreach (square s in consideredMoves)
{
//if the piece is not pinned, proceed normally
if (!currentPinned)
{
//move is only valid in check if it conincides with the pushmask or the capturemask
if (masks.captureMask[s.xPosition, s.yPosition] || masks.pushMask[s.xPosition, s.yPosition])
{
board.legalMoves.Add(new move(p, s));
}
}
else
{
//move has to coincide with the pin rules in addition to the pushmask or capturemask
if ((masks.captureMask[s.xPosition, s.yPosition] || masks.pushMask[s.xPosition, s.yPosition]) &&
(currentPin.pushSquares.Exists(sq => sq == s) || currentPin.takeSquares.Exists(sq => sq == s)))
{
board.legalMoves.Add(new move(p, s));
}
}
}
currentPin = null;
currentPinned = false;
}
//no other moves are valid except for king moves, blocks or checker captures
return;
}
//no check is in play - calculate moves like normal
//pins.cs handles the calculation of pins
//TODO: pinned pieces(separately)
else
{
List <piece> pcs = null;
if (board.turn == "white")
{
pcs = board.whitePieces;
}
else
{
pcs = board.blackPieces;
}
List <square> consideredMoves = null;
foreach (piece p in pcs)
{
//separate behavior for pinned pieces
if (pins.existingPins.Exists(pi => pi.pinnedPiece == p))
{
currentPinned = true;
currentPin = pins.existingPins.Find(pi => pi.pinnedPiece == p);
}
consideredMoves = p.getLegalMoves();
foreach (square s in consideredMoves)
{
//normal behavior
if (!currentPinned)
{
board.legalMoves.Add(new move(p, s));
}
else
{
if (currentPin.pushSquares.Exists(sq => sq == s) || currentPin.takeSquares.Exists(sq => sq == s))
{
board.legalMoves.Add(new move(p, s));
}
}
}
currentPin = null;
currentPinned = false;
}
}
}
public pin(piece p, List <square> take, List <square> push)
{
pinnedPiece = p;
takeSquares = take;
pushSquares = push;
}
//figures out which pieces are pinned and puts them in pinnedPieces list
public static void calculatePins()
{
existingPins = new List <pin>();
//reference to the player's king
piece playerKing = null;
if (board.turn == "white")
{
playerKing = board.whitePieces.Find(p => p.pieceType == "king");
}
else
{
playerKing = board.blackPieces.Find(p => p.pieceType == "king");
}
//pins are calculates in 8 directions
//a search starts in a direction from the king - it "xrays" a friendly piece once and marks it as a candidate for a pin
//if the search finds an enemy candidate for a pinner after the xray, the pinned piece is marked
//the search ends unsuccesfully if multiple friendly pieces are hit in a row, if an unfit pinner candidate is found or if the edge of the board is hit
int i = playerKing.xPosition; int j = playerKing.yPosition;
bool xrayed = false; bool foundPin = false;
List <square> potentialPush = new List <square>();
List <square> potentialTake = new List <square>();
piece pinCandidate = null;
//up
j = playerKing.yPosition - 1;
while (j >= 0)
{
//nothing there - add to potential moves for pinned piece on this line
if (board.squareArray[i, j].here == null)
{
potentialPush.Add(board.squareArray[i, j]);
}
else
{
//xray the friendly piece and make it a candidate
if (!xrayed && board.squareArray[i, j].here.pieceColor == board.turn)
{
xrayed = true;
pinCandidate = board.squareArray[i, j].here;
}
//we found the pinning piece
else if (xrayed && (board.squareArray[i, j].here.pieceType == "rook" || board.squareArray[i, j].here.pieceType == "queen") &&
board.squareArray[i, j].here.pieceColor != board.turn)
{
potentialTake.Add(board.squareArray[i, j]);
foundPin = true;
break;
}
//we found something else => the search was not successful, there is no pin here
else
{
break;
}
}
j--;
}
//if we found a pin, save it
if (foundPin)
{
existingPins.Add(new pin(pinCandidate, potentialTake, potentialPush));
}
//right
i = playerKing.xPosition; j = playerKing.yPosition;
xrayed = false; foundPin = false;
potentialPush = new List <square>();
potentialTake = new List <square>();
pinCandidate = null;
i = playerKing.xPosition + 1;
while (i < 8)
{
//nothing there - add to potential moves for pinned piece on this line
if (board.squareArray[i, j].here == null)
{
potentialPush.Add(board.squareArray[i, j]);
}
else
{
//xray the friendly piece and make it a candidate
if (!xrayed && board.squareArray[i, j].here.pieceColor == board.turn)
{
xrayed = true;
pinCandidate = board.squareArray[i, j].here;
}
//we found the pinning piece
else if (xrayed && (board.squareArray[i, j].here.pieceType == "rook" || board.squareArray[i, j].here.pieceType == "queen") &&
board.squareArray[i, j].here.pieceColor != board.turn)
{
potentialTake.Add(board.squareArray[i, j]);
foundPin = true;
break;
}
//we found something else => the search was not successful, there is no pin here
else
{
break;
}
}
i++;
}
//if we found a pin, save it
if (foundPin)
{
existingPins.Add(new pin(pinCandidate, potentialTake, potentialPush));
}
//down
i = playerKing.xPosition; j = playerKing.yPosition;
xrayed = false; foundPin = false;
potentialPush = new List <square>();
potentialTake = new List <square>();
pinCandidate = null;
j = playerKing.xPosition + 1;
while (j < 8)
{
//nothing there - add to potential moves for pinned piece on this line
if (board.squareArray[i, j].here == null)
{
potentialPush.Add(board.squareArray[i, j]);
}
else
{
//xray the friendly piece and make it a candidate
if (!xrayed && board.squareArray[i, j].here.pieceColor == board.turn)
{
xrayed = true;
pinCandidate = board.squareArray[i, j].here;
}
//we found the pinning piece
else if (xrayed && (board.squareArray[i, j].here.pieceType == "rook" || board.squareArray[i, j].here.pieceType == "queen") &&
board.squareArray[i, j].here.pieceColor != board.turn)
{
potentialTake.Add(board.squareArray[i, j]);
foundPin = true;
break;
}
//we found something else => the search was not successful, there is no pin here
else
{
break;
}
}
j++;
}
//if we found a pin, save it
if (foundPin)
{
existingPins.Add(new pin(pinCandidate, potentialTake, potentialPush));
}
//left
i = playerKing.xPosition; j = playerKing.yPosition;
xrayed = false; foundPin = false;
potentialPush = new List <square>();
potentialTake = new List <square>();
pinCandidate = null;
i = playerKing.xPosition - 1;
while (i >= 0)
{
//nothing there - add to potential moves for pinned piece on this line
if (board.squareArray[i, j].here == null)
{
potentialPush.Add(board.squareArray[i, j]);
}
else
{
//xray the friendly piece and make it a candidate
if (!xrayed && board.squareArray[i, j].here.pieceColor == board.turn)
{
xrayed = true;
pinCandidate = board.squareArray[i, j].here;
}
//we found the pinning piece
else if (xrayed && (board.squareArray[i, j].here.pieceType == "rook" || board.squareArray[i, j].here.pieceType == "queen") &&
board.squareArray[i, j].here.pieceColor != board.turn)
{
potentialTake.Add(board.squareArray[i, j]);
foundPin = true;
break;
}
//we found something else => the search was not successful, there is no pin here
else
{
break;
}
}
i--;
}
//if we found a pin, save it
if (foundPin)
{
existingPins.Add(new pin(pinCandidate, potentialTake, potentialPush));
}
//"rook" pins are done(working properly), now the diagonal "bishop" pins
//TODO
//top right
i = playerKing.xPosition; j = playerKing.yPosition;
xrayed = false; foundPin = false;
potentialPush = new List <square>();
potentialTake = new List <square>();
pinCandidate = null;
i = playerKing.xPosition + 1; j = playerKing.yPosition - 1;
while (i < 8 && j >= 0)
{
//nothing there - add to potential moves for pinned piece on this line
if (board.squareArray[i, j].here == null)
{
potentialPush.Add(board.squareArray[i, j]);
}
else
{
//xray the friendly piece and make it a candidate
if (!xrayed && board.squareArray[i, j].here.pieceColor == board.turn)
{
xrayed = true;
pinCandidate = board.squareArray[i, j].here;
}
//we found the pinning piece
else if (xrayed && (board.squareArray[i, j].here.pieceType == "bishop" || board.squareArray[i, j].here.pieceType == "queen") &&
board.squareArray[i, j].here.pieceColor != board.turn)
{
potentialTake.Add(board.squareArray[i, j]);
foundPin = true;
break;
}
//we found something else => the search was not successful, there is no pin here
else
{
break;
}
}
i++; j--;
}
//if we found a pin, save it
if (foundPin)
{
existingPins.Add(new pin(pinCandidate, potentialTake, potentialPush));
}
//bottom right
i = playerKing.xPosition; j = playerKing.yPosition;
xrayed = false; foundPin = false;
potentialPush = new List <square>();
potentialTake = new List <square>();
pinCandidate = null;
i = playerKing.xPosition + 1; j = playerKing.yPosition + 1;
while (i < 8 && j < 8)
{
//nothing there - add to potential moves for pinned piece on this line
if (board.squareArray[i, j].here == null)
{
potentialPush.Add(board.squareArray[i, j]);
}
else
{
//xray the friendly piece and make it a candidate
if (!xrayed && board.squareArray[i, j].here.pieceColor == board.turn)
{
xrayed = true;
pinCandidate = board.squareArray[i, j].here;
}
//we found the pinning piece
else if (xrayed && (board.squareArray[i, j].here.pieceType == "bishop" || board.squareArray[i, j].here.pieceType == "queen") &&
board.squareArray[i, j].here.pieceColor != board.turn)
{
potentialTake.Add(board.squareArray[i, j]);
foundPin = true;
break;
}
//we found something else => the search was not successful, there is no pin here
else
{
break;
}
}
i++; j++;
}
//if we found a pin, save it
if (foundPin)
{
existingPins.Add(new pin(pinCandidate, potentialTake, potentialPush));
}
//bottom left
i = playerKing.xPosition; j = playerKing.yPosition;
xrayed = false; foundPin = false;
potentialPush = new List <square>();
potentialTake = new List <square>();
pinCandidate = null;
i = playerKing.xPosition - 1; j = playerKing.yPosition + 1;
while (j < 8 && i >= 0)
{
//nothing there - add to potential moves for pinned piece on this line
if (board.squareArray[i, j].here == null)
{
potentialPush.Add(board.squareArray[i, j]);
}
else
{
//xray the friendly piece and make it a candidate
if (!xrayed && board.squareArray[i, j].here.pieceColor == board.turn)
{
xrayed = true;
pinCandidate = board.squareArray[i, j].here;
}
//we found the pinning piece
else if (xrayed && (board.squareArray[i, j].here.pieceType == "bishop" || board.squareArray[i, j].here.pieceType == "queen") &&
board.squareArray[i, j].here.pieceColor != board.turn)
{
potentialTake.Add(board.squareArray[i, j]);
foundPin = true;
break;
}
//we found something else => the search was not successful, there is no pin here
else
{
break;
}
}
i--; j++;
}
//if we found a pin, save it
if (foundPin)
{
existingPins.Add(new pin(pinCandidate, potentialTake, potentialPush));
}
//top left
i = playerKing.xPosition; j = playerKing.yPosition;
xrayed = false; foundPin = false;
potentialPush = new List <square>();
potentialTake = new List <square>();
pinCandidate = null;
i = playerKing.xPosition - 1; j = playerKing.yPosition - 1;
while (i >= 0 && j >= 0)
{
//nothing there - add to potential moves for pinned piece on this line
if (board.squareArray[i, j].here == null)
{
potentialPush.Add(board.squareArray[i, j]);
}
else
{
//xray the friendly piece and make it a candidate
if (!xrayed && board.squareArray[i, j].here.pieceColor == board.turn)
{
xrayed = true;
pinCandidate = board.squareArray[i, j].here;
}
//we found the pinning piece
else if (xrayed && (board.squareArray[i, j].here.pieceType == "bishop" || board.squareArray[i, j].here.pieceType == "queen") &&
board.squareArray[i, j].here.pieceColor != board.turn)
{
potentialTake.Add(board.squareArray[i, j]);
foundPin = true;
break;
}
//we found something else => the search was not successful, there is no pin here
else
{
break;
}
}
i--; j--;
}
//if we found a pin, save it
if (foundPin)
{
existingPins.Add(new pin(pinCandidate, potentialTake, potentialPush));
}
}
//calculates how many pieces are in check for the player and creates the masks
public static void calculateCheckers()
{
//init of masks
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
kingDangerMask[i, j] = false;
captureMask[i, j] = false;
pushMask[i, j] = false;
checkingMask[i, j] = false;
}
}
checkerCount = 0;
//pointer to the player's king (for ease of reading)
piece playerKing;
if (board.turn == "white")
{
playerKing = board.whitePieces.Find(p => p.pieceType == "king");
}
else
{
playerKing = board.blackPieces.Find(p => p.pieceType == "king");
}
//first calculate the danger squares
if (board.turn == "white")
{
foreach (piece p in board.blackPieces)
{
if (p.pieceType == "pawn")
{
if (p.xPosition - 1 >= 0)
{
kingDangerMask[p.xPosition - 1, p.yPosition + 1] = true;
if (board.squareArray[p.xPosition - 1, p.yPosition + 1].here != null &&
board.squareArray[p.xPosition - 1, p.yPosition + 1].here.pieceType == "king" &&
board.squareArray[p.xPosition - 1, p.yPosition + 1].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
if (p.xPosition + 1 < 8)
{
kingDangerMask[p.xPosition + 1, p.yPosition + 1] = true;
if (board.squareArray[p.xPosition + 1, p.yPosition + 1].here != null &&
board.squareArray[p.xPosition + 1, p.yPosition + 1].here.pieceType == "king" &&
board.squareArray[p.xPosition + 1, p.yPosition + 1].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
}
else if (p.pieceType == "knight")
{
List <square> m = utils.knightMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
if (board.squareArray[s.xPosition, s.yPosition].here != null &&
board.squareArray[s.xPosition, s.yPosition].here.pieceType == "king" &&
board.squareArray[s.xPosition, s.yPosition].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
}
else if (p.pieceType == "bishop")
{
List <square> m = utils.bishopDangerMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
if (board.squareArray[s.xPosition, s.yPosition].here != null &&
board.squareArray[s.xPosition, s.yPosition].here.pieceType == "king" &&
board.squareArray[s.xPosition, s.yPosition].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
}
else if (p.pieceType == "rook")
{
List <square> m = utils.rookDangerMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
if (board.squareArray[s.xPosition, s.yPosition].here != null &&
board.squareArray[s.xPosition, s.yPosition].here.pieceType == "king" &&
board.squareArray[s.xPosition, s.yPosition].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
}
else if (p.pieceType == "queen")
{
//treat the queen like a rook + bishop
List <square> m = utils.bishopDangerMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
if (board.squareArray[s.xPosition, s.yPosition].here != null &&
board.squareArray[s.xPosition, s.yPosition].here.pieceType == "king" &&
board.squareArray[s.xPosition, s.yPosition].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
m = utils.rookDangerMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
if (board.squareArray[s.xPosition, s.yPosition].here != null &&
board.squareArray[s.xPosition, s.yPosition].here.pieceType == "king" &&
board.squareArray[s.xPosition, s.yPosition].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
}
else if (p.pieceType == "king")
{
List <square> m = utils.kingDangerMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
}
}
}
}
else if (board.turn == "black")
{
foreach (piece p in board.whitePieces)
{
if (p.pieceType == "pawn")
{
if (p.xPosition - 1 >= 0)
{
kingDangerMask[p.xPosition - 1, p.yPosition - 1] = true;
if (board.squareArray[p.xPosition - 1, p.yPosition - 1].here != null &&
board.squareArray[p.xPosition - 1, p.yPosition - 1].here.pieceType == "king" &&
board.squareArray[p.xPosition - 1, p.yPosition - 1].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
if (p.xPosition + 1 < 8)
{
kingDangerMask[p.xPosition + 1, p.yPosition - 1] = true;
if (board.squareArray[p.xPosition + 1, p.yPosition - 1].here != null &&
board.squareArray[p.xPosition + 1, p.yPosition - 1].here.pieceType == "king" &&
board.squareArray[p.xPosition + 1, p.yPosition - 1].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
}
else if (p.pieceType == "knight")
{
List <square> m = utils.knightMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
if (board.squareArray[s.xPosition, s.yPosition].here != null &&
board.squareArray[s.xPosition, s.yPosition].here.pieceType == "king" &&
board.squareArray[s.xPosition, s.yPosition].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
}
else if (p.pieceType == "bishop")
{
List <square> m = utils.bishopDangerMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
if (board.squareArray[s.xPosition, s.yPosition].here != null &&
board.squareArray[s.xPosition, s.yPosition].here.pieceType == "king" &&
board.squareArray[s.xPosition, s.yPosition].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
}
else if (p.pieceType == "rook")
{
List <square> m = utils.rookDangerMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
if (board.squareArray[s.xPosition, s.yPosition].here != null &&
board.squareArray[s.xPosition, s.yPosition].here.pieceType == "king" &&
board.squareArray[s.xPosition, s.yPosition].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
}
else if (p.pieceType == "queen")
{
//treat the queen like a rook + bishop
List <square> m = utils.bishopDangerMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
if (board.squareArray[s.xPosition, s.yPosition].here != null &&
board.squareArray[s.xPosition, s.yPosition].here.pieceType == "king" &&
board.squareArray[s.xPosition, s.yPosition].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
m = utils.rookDangerMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
if (board.squareArray[s.xPosition, s.yPosition].here != null &&
board.squareArray[s.xPosition, s.yPosition].here.pieceType == "king" &&
board.squareArray[s.xPosition, s.yPosition].here.pieceColor == board.turn)
{
checkingMask[p.xPosition, p.yPosition] = true;
checkerCount++;
}
}
}
else if (p.pieceType == "king")
{
List <square> m = utils.kingDangerMoves(board.squareArray[p.xPosition, p.yPosition]);
foreach (square s in m)
{
kingDangerMask[s.xPosition, s.yPosition] = true;
}
}
}
}
//now the king danger squares are calculated - we know where the king can't move because that square is attacked
//we know which squares have pieces that are GIVING CHECK to the player's king
//we also know the number of pieces giving check to the player's king
//if checkerCount >= 2 then the only legal moves are king moves to safe squares
//if checkerCount == 1 then we have 3 options
// -move the king out of check
// -capture the checking piece
// -block the checking piece
//we have to move the king => no capture is valid
if (checkerCount >= 2)
{
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
captureMask[i, j] = false;
}
}
}
//we can evade the single check by capturing the piece
if (checkerCount == 1)
{
captureMask = checkingMask;
}
//now the push mask - will include squares that we can move a piece to in order to block a single check
//with double checks, check can't be blocked => mask is false
if (checkerCount >= 2)
{
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
pushMask[i, j] = false;
}
}
}
piece checkingPiece = null;
//if single check, then there is only one "true" on the checkingMask - find it to find the checking piece
if (checkerCount == 1)
{
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
if (checkingMask[i, j] == true) //we found the only checking piece
{
checkingPiece = board.squareArray[i, j].here;
}
}
}
//if it's a "slider" piece, find squares where we can block the check - between the piece and the king
if (checkingPiece.pieceType == "rook" || checkingPiece.pieceType == "queen" || checkingPiece.pieceType == "bishop")
{
List <square> pieceSlider = null;
List <square> kingSlider = null;
if (checkingPiece.pieceType == "rook" ||
checkingPiece.pieceType == "queen")
{
pieceSlider = utils.rookSliderMoves(board.squareArray[checkingPiece.xPosition, checkingPiece.yPosition]);
kingSlider = utils.rookSliderMoves(board.squareArray[playerKing.xPosition, playerKing.yPosition]);
//overlap the two sliders in a 2 dimensional array to get the squares where blocking is possible
int[,] overlap = new int[8, 8];
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
overlap[i, j] = 0;
}
}
foreach (square s in kingSlider)
{
overlap[s.xPosition, s.yPosition]++;
}
foreach (square s in pieceSlider)
{
overlap[s.xPosition, s.yPosition]++;
}
//if both pieces "saw" the square => add it to the pushMask
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
if (overlap[i, j] == 2)
{
pushMask[i, j] = true;
}
}
}
}
if (checkingPiece.pieceType == "bishop" ||
checkingPiece.pieceType == "queen")
{
pieceSlider = utils.bishopSliderMoves(board.squareArray[checkingPiece.xPosition, checkingPiece.yPosition]);
kingSlider = utils.bishopSliderMoves(board.squareArray[playerKing.xPosition, playerKing.yPosition]);
//overlap the two sliders in a 2 dimensional array to get the squares where blocking is possible
int[,] overlap = new int[8, 8];
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
overlap[i, j] = 0;
}
}
foreach (square s in kingSlider)
{
overlap[s.xPosition, s.yPosition]++;
}
foreach (square s in pieceSlider)
{
overlap[s.xPosition, s.yPosition]++;
}
//if both pieces "saw" the square => add it to the pushMask
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
if (overlap[i, j] == 2)
{
pushMask[i, j] = true;
}
}
}
}
}
}
//now both the push mask and the capture mask is DONE
//TODO: pinned pieces
}