guneysus
3/31/2015 - 1:01 PM
Downloaded from http://lathamcity.com/chess/chessboard.js
Downloaded from http://lathamcity.com/chess/chessboard.js
/*==========================*/
/* Piece class declaration */
/*==========================*/
function Piece(color, type, obj, square){
/* type is what kind of piece it is (a constant defined later), and color is white or black (also constants defined later) */
this.type = type;
this.color = color;
/* hasMoved is used, for instance, to check if the king and rook can castle. */
this.hasMoved = false;
/* square is the square it's on. square.piece is set in this constructor because square is defined before piece. */
this.square = square;
square.piece = this;
/* representation is the actual image on the board */
this.representation = obj;
/* epleft and epright are true if the piece is a pawn that can capture via en passant on its left or right */
this.epleft = false;
this.epright = false;
/* the available array holds a key value on each of the 64 squares indicating how the piece relates to that square.
* these relations are defined in constants later on.
* updateMoves is a huge function that sets up this array properly.
*/
this.updateMoves = function(){
/* By default, the piece can not go anywhere. If it can go to some squares, or interacts with them in an abnormal way,
* that will be defined below.
*/
for (var i = 0; i < 8; i++){
for (var j = 0; j < 8; j++){
this.available[i][j] = Piece.NO_MOVE;
}
}
switch (this.type){
case Piece.PAWN:
for (var i = 0; i < 8; i++){
for (var j = 0; j < 8; j++){
var testSquare = squares[i][j];
var row = j + 1; //Row is the actual row it's on, not the array index. Same for column.
var col = i + 1; //This is for readability. Also, column and row on square are this way.
if (this.color == Piece.WHITE){
if (this.square.row == 2){ //If the pawn is on the second rank, then it can go up two squares on its first move.
if (row == 3 || (row == 4 && squares[i][j - 1].piece == null)) //It can only go up two if the square up one is clear.
if (this.square.column == col)
if (testSquare.piece == null )
this.available[i][j] = Piece.MOVE_ONLY;
else
this.available[i][j] = Piece.NO_MOVE;
else
if (Math.abs(this.square.column - col) == 1 //Check captures/protections on the second rank.
&& testSquare.piece != null && row == 3) //These are only valid for pieces on the third row.
if (testSquare.piece.color != this.color)
this.available[i][j] = Piece.CAPTURE;
else
this.available[i][j] = Piece.FRIENDLY_PIECE;
else
this.available[i][j] = Piece.NO_MOVE;
else
this.available[i][j] = Piece.NO_MOVE;
}
else{
if (row == this.square.row + 1) //If it is on any other rank, it can only move one space up.
if (this.square.column == col)
if (testSquare.piece == null)
this.available[i][j] = Piece.MOVE_ONLY;
else
this.available[i][j] = Piece.NO_MOVE;
else //Check captures on the adjacent ranks.
if (Math.abs(this.square.column - col) == 1
&& testSquare.piece != null)
if (testSquare.piece.color != this.color)
this.available[i][j] = Piece.CAPTURE;
else
this.available[i][j] = Piece.FRIENDLY_PIECE;
else
this.available[i][j] = Piece.NO_MOVE;
else
this.available[i][j] = Piece.NO_MOVE;
}
}
else{ //Black pawn
if (this.square.row == 7){ //Seventh rank: One or two down
if (row == 6 || (row == 5 && squares[i][j + 1].piece == null))
if (this.square.column == col)
if (testSquare.piece == null)
this.available[i][j] = Piece.MOVE_ONLY;
else
this.available[i][j] = Piece.NO_MOVE;
else
if (Math.abs(this.square.column - col) == 1 //Check seventh rank captures
&& testSquare.piece != null && row == 6)
if (testSquare.piece.color != this.color)
this.available[i][j] = Piece.CAPTURE;
else
this.available[i][j] = Piece.FRIENDLY_PIECE;
else
this.available[i][j] = Piece.NO_MOVE;
else
this.available[i][j] = Piece.NO_MOVE;
}
else{
if (row == this.square.row - 1) //Other rank: One down
if (this.square.column == col)
if (testSquare.piece == null)
this.available[i][j] = Piece.MOVE_ONLY;
else
this.available[i][j] = Piece.NO_MOVE;
else //Check other rank caps
if (Math.abs(this.square.column - col) == 1
&& testSquare.piece != null)
if (testSquare.piece.color != this.color)
this.available[i][j] = Piece.CAPTURE;
else
this.available[i][j] = Piece.FRIENDLY_PIECE;
else
this.available[i][j] = Piece.NO_MOVE;
else
this.available[i][j] = Piece.NO_MOVE;
}
}
}
}
/* Now check for en passant. */
if (this.epleft && this.square.column != 1){ //The != is there because this gets run through when possible moves
if (this.color == Piece.WHITE) //are calculated. So EP will still be true, but the piece will hypothetically
this.available[this.square.column - 2][this.square.row] = Piece.EN_PASSANT; //be on the ep-ing square.
else
this.available[this.square.column - 2][this.square.row - 2] = Piece.EN_PASSANT;
}
if (this.epright && this.square.column != 8)
if (this.color == Piece.WHITE)
this.available[this.square.column][this.square.row] = Piece.EN_PASSANT;
else
this.available[this.square.column][this.square.row - 2] = Piece.EN_PASSANT;
break;
/* For knights, the rule is that if a square is three squares away but not in a straight line,
* they can go to it (I made this up and it's a confusing way to think about it but it works).
* Knights can jump over other pieces so we don't need to worry about checking if there is a piece
* in the way.
*/
case Piece.KNIGHT:
for (var i = 1; i <= 8; i++){
for (var j = 1; j <= 8; j++){
var testSquare = squares[i - 1][j - 1];
if ((Math.abs(this.square.row - j)
+ Math.abs(this.square.column - i) == 3)
&& this.square.row != j
&& this.square.column != i)
if ((testSquare.piece != null) && (testSquare.piece.color == this.color))
this.available[i - 1][j - 1] = Piece.FRIENDLY_PIECE;
else
this.available[i - 1][j - 1] = Piece.CAPTURE;
else
this.available[i - 1][j - 1] = Piece.NO_MOVE;
}
}
break;
/* For bishops, rooks and queens, check along the straight line. After running into a piece, go to the next line.
* This is tedious but I think it has to be the best way to do it.
*/
case Piece.BISHOP:
var bi = this.square.column;
var bj = this.square.row;
outerloop:
while (bi <= 8 && bj <= 8){
var testSquare = squares[bi - 1][bj - 1];
if (testSquare.piece == null)
this.available[bi - 1][bj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[bi - 1][bj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[bi - 1][bj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[bi - 1][bj - 1] = Piece.CAPTURE;
break outerloop;
}
}
bi++;
bj++;
}
bi = this.square.column;
bj = this.square.row;
outerloop:
while (bi <= 8 && bj >= 1){
var testSquare = squares[bi - 1][bj - 1];
if (testSquare.piece == null)
this.available[bi - 1][bj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[bi - 1][bj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[bi - 1][bj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[bi - 1][bj - 1] = Piece.CAPTURE;
break outerloop;
}
}
bi++;
bj--;
}
bi = this.square.column;
bj = this.square.row;
outerloop:
while (bi >= 1 && bj <= 8){
var testSquare = squares[bi - 1][bj - 1];
if (testSquare.piece == null)
this.available[bi - 1][bj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[bi - 1][bj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[bi - 1][bj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[bi - 1][bj - 1] = Piece.CAPTURE;
break outerloop;
}
}
bi--;
bj++;
}
bi = this.square.column;
bj = this.square.row;
outerloop:
while (bi >= 1 && bj >= 1){
var testSquare = squares[bi - 1][bj - 1];
if (testSquare.piece == null)
this.available[bi - 1][bj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[bi - 1][bj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[bi - 1][bj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[bi - 1][bj - 1] = Piece.CAPTURE;
break outerloop;
}
}
bi--;
bj--;
}
break;
case Piece.ROOK:
var ri = this.square.column;
var rj = this.square.row;
outerloop:
while (ri <= 8){
var testSquare = squares[ri - 1][rj - 1];
if (testSquare.piece == null)
this.available[ri - 1][rj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[ri - 1][rj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[ri - 1][rj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[ri - 1][rj - 1] = Piece.CAPTURE;
break outerloop;
}
}
ri++;
}
ri = this.square.column;
outerloop:
while (ri >= 1){
var testSquare = squares[ri - 1][rj - 1];
if (testSquare.piece == null)
this.available[ri - 1][rj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[ri - 1][rj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[ri - 1][rj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[ri - 1][rj - 1] = Piece.CAPTURE;
break outerloop;
}
}
ri--;
}
ri = this.square.column;
rj = this.square.row;
outerloop:
while (rj <= 8){
var testSquare = squares[ri - 1][rj - 1];
if (testSquare.piece == null)
this.available[ri - 1][rj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[ri - 1][rj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[ri - 1][rj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[ri - 1][rj - 1] = Piece.CAPTURE;
break outerloop;
}
}
rj++;
}
rj = this.square.row;
outerloop:
while (rj >= 1){
var testSquare = squares[ri - 1][rj - 1];
if (testSquare.piece == null)
this.available[ri - 1][rj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[ri - 1][rj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[ri - 1][rj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[ri - 1][rj - 1] = Piece.CAPTURE;
break outerloop;
}
}
rj--;
}
break;
case Piece.QUEEN:
var qi = this.square.column;
var qj = this.square.row;
outerloop:
while (qi <= 8 && qj <= 8){
var testSquare = squares[qi - 1][qj - 1];
if (testSquare.piece == null)
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[qi - 1][qj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[qi - 1][qj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
break outerloop;
}
}
qi++;
qj++;
}
qi = this.square.column;
qj = this.square.row;
outerloop:
while (qi <= 8 && qj >= 1){
var testSquare = squares[qi - 1][qj - 1];
if (testSquare.piece == null)
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[qi - 1][qj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[qi - 1][qj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
break outerloop;
}
}
qi++;
qj--;
}
qi = this.square.column;
qj = this.square.row;
outerloop:
while (qi >= 1 && qj <= 8){
var testSquare = squares[qi - 1][qj - 1];
if (testSquare.piece == null)
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[qi - 1][qj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[qi - 1][qj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
break outerloop;
}
}
qi--;
qj++;
}
qi = this.square.column;
qj = this.square.row;
outerloop:
while (qi >= 1 && qj >= 1){
var testSquare = squares[qi - 1][qj - 1];
if (testSquare.piece == null)
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[qi - 1][qj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[qi - 1][qj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
break outerloop;
}
}
qi--;
qj--;
}
qi = this.square.column;
qj = this.square.row;
outerloop:
while (qi <= 8){
var testSquare = squares[qi - 1][qj - 1];
if (testSquare.piece == null)
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[qi - 1][qj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[qi - 1][qj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
break outerloop;
}
}
qi++;
}
qi = this.square.column;
outerloop:
while (qi >= 1){
var testSquare = squares[qi - 1][qj - 1];
if (testSquare.piece == null)
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[qi - 1][qj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[qi - 1][qj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
break outerloop;
}
}
qi--;
}
qi = this.square.column;
qj = this.square.row;
outerloop:
while (qj <= 8){
var testSquare = squares[qi - 1][qj - 1];
if (testSquare.piece == null)
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[qi - 1][qj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[qi - 1][qj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
break outerloop;
}
}
qj++;
}
qj = this.square.row;
outerloop:
while (qj >= 1){
var testSquare = squares[qi - 1][qj - 1];
if (testSquare.piece == null)
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
else{
if (testSquare.piece.color == this.color){
this.available[qi - 1][qj - 1] = Piece.NO_MOVE;
if (testSquare.piece != this){
this.available[qi - 1][qj - 1] = Piece.FRIENDLY_PIECE;
break outerloop;
}
}
else{
this.available[qi - 1][qj - 1] = Piece.CAPTURE;
break outerloop;
}
}
qj--;
}
break;
/* For the king, we're checking all the squares in the 3 x 3 box that surrounds it.
* This results in the king "protecting" itself, but saves space.
* We also check for castling by seeing if both the king and rook have not moved and the squares are clear.
* At this point, we don't look to see if the squares are not in check, but that comes into play later.
*/
case Piece.KING:
for (var i = -1; i <= 1; i++){
for (var j = -1; j <= 1; j++){
var col = this.square.column + i;
var row = this.square.row + j;
if ((1 <= col) && (col <= 8)
&& (1 <= row) && (row <= 8)){
if (squares[col - 1][row - 1].piece == null
|| squares[col - 1][row - 1].piece.color != this.color)
this.available[col - 1][row - 1] = Piece.CAPTURE;
else
this.available[col - 1][row - 1] = Piece.FRIENDLY_PIECE;
}
}
}
if (this.color == Piece.WHITE && !wk.hasMoved){
if (!wr2.hasMoved && squares[5][0].piece == null && squares[6][0].piece == null)
this.available[6][0] = Piece.KINGSIDE_CASTLE;
if (!wr1.hasMoved && squares[3][0].piece == null && squares[2][0].piece == null && squares[1][0].piece == null)
this.available[2][0] = Piece.QUEENSIDE_CASTLE;
} else if (this.color == Piece.BLACK && !bk.hasMoved){
if (!br2.hasMoved && squares[5][7].piece == null && squares[6][7].piece == null)
this.available[6][7] = Piece.KINGSIDE_CASTLE;
if (!br1.hasMoved && squares[3][7].piece == null && squares[2][7].piece == null && squares[1][0].piece == null)
this.available[2][7] = Piece.QUEENSIDE_CASTLE;
}
}
};
/* This is the best way to declare an 8 x 8 2d array. */
this.available = (function(a){
while(a.push([]) < 9);
return a;
})([]);
}
/* A bunch of constants */
Piece.WHITE = 0;
Piece.BLACK = 1;
Piece.PAWN = 0;
Piece.KNIGHT = 1;
Piece.BISHOP = 2;
Piece.ROOK = 3;
Piece.QUEEN = 4;
Piece.KING = 5;
Piece.FRIENDLY_PIECE = -1;
Piece.NO_MOVE = 0;
Piece.MOVE_ONLY = 1;
Piece.CAPTURE = 2;
Piece.KINGSIDE_CASTLE = 3;
Piece.QUEENSIDE_CASTLE = 4;
Piece.EN_PASSANT = 5;
/*===========================*/
/* Square class declaration */
/*===========================*/
function Square(column, row){
this.column = column;
this.row = row;
this.piece = null;
this.coordinates = {
x : (column - 1) * 50,
y : (8 - row) * 50
};
}
/*======================*/
/* A doubly linked list */
/*======================*/
function LLNode(prev, contents, next){
this.prev = prev;
this.contents = contents;
this.next = next;
}
function LinkedList(){
this.head = null;
this.tail = null;
this.length = 0;
this.add = function(piece){
node = new LLNode(null, piece, null);
if (this.length == 0){
this.head = node;
this.tail = node;
}
else{
this.tail.next = node;
node.prev = this.tail;
this.tail = node;
}
this.length++;
};
this.remove = function(piece){
node = this.head;
if (node != null){
do{
if (node.contents == piece){
if (node.prev != null)
node.prev.next = node.next;
else
this.head = node.next;
if (node.next != null)
node.next.prev = node.prev;
else
this.tail = node.prev;
this.length--;
}
node = node.next;
} while (node != null)
}
};
}
/*===========================================*/
/* Code for drag-and-dropping pieces around */
/*===========================================*/
var pickedUp = false;
var pickedUpPiece = null;
document.onmousedown = function(e){
var x = e.pageX;
var y = e.pageY;
var column = (Math.floor(x / 50) + 1);
var row = 8 - (Math.floor(y / 50));
if (0 < column && column <= 8 && 0 < row && row <= 8){
var sq = squares[(column - 1)][(row - 1)];
var pc = sq.piece;
document.body.focus();
if (pc != null && ((turn == true && pc.color == Piece.WHITE) || (turn == false && pc.color == Piece.BLACK))){
pickedUp = true;
pickedUpPiece = pc;
document.onmouseup = function(e){
var x = e.pageX;
var y = e.pageY;
var column = (Math.floor(x / 50) + 1);
var row = 8 - (Math.floor(y / 50));
if ((0 < row) && (row <= 8) && (0 < column) && (column <= 8)){
var sq = squares[(column - 1)][(row - 1)];
movePiece(sq);
pickedUp = false;
pickedUpPiece = null;
}
else{
movePiece(pickedUpPiece.square);
pickedUp = false;
pickedUpPiece = null;
}
document.onmouseup = function(){return false;};
};
document.onmousemove = function(e){
if (pickedUpPiece != null){
pickedUpPiece.representation.style.left = (e.pageX - 25) + "px";
pickedUpPiece.representation.style.top = (e.pageY - 25) + "px";
}
};
return false;
}
else
return false;
}
};
/*===========================================*/
/* Code for what happens when a piece moves */
/*===========================================*/
var turn = true; //true is white
var check = false;
var checkmate = false;
var stalemate = false;
var draw = false;
var gameOn = true;
var totalMoves = 0;
var totalGames = 0;
var totalCheckmates = 0;
var totalStalemates = 0;
var totalDraws = 0;
var totalBalance = 0;
var move = 1;
var computerPlaysBlack = true;
var computerPlaysWhite = false;
function movePiece(square){
oldPiece = square.piece;
oldSquare = pickedUpPiece.square;
var ep = (pickedUpPiece.available[square.column - 1][square.row - 1] == Piece.EN_PASSANT);
promoted = false;
if (pickedUpPiece.type == Piece.PAWN
&& ((pickedUpPiece.square.column == square.column) ? square.piece == null : square.piece != null) //Pawn moves != queen moves
&& ((pickedUpPiece.color == Piece.WHITE) ? square.row == 8 : square.row == 1)){ //Promotion
promoted = true;
pickedUpPiece.type = 4;
if (pickedUpPiece.color == Piece.WHITE)
pickedUpPiece.representation.setAttribute("src", "images/wqueen.png");
else
pickedUpPiece.representation.setAttribute("src", "images/bqueen.png");
}
if (checkValidMove(pickedUpPiece, square, true) == true){
pickedUpPiece.square = oldSquare;
square.piece = oldPiece;
pickedUpPiece.square.piece = null;
pickedUpPiece.square = square;
if ((pickedUpPiece.square.piece != null) || ep){
if (pickedUpPiece.square.piece != null && pickedUpPiece.square.piece.color == pickedUpPiece.color){
pickedUpPiece.square = oldSquare;
pickedUpPiece.square.piece = pickedUpPiece;
pickedUpPiece.representation.style.left = pickedUpPiece.square.coordinates.x + "px";
pickedUpPiece.representation.style.top = pickedUpPiece.square.coordinates.y + "px";
if (promoted){
pickedUpPiece.type = 0;
if (pickedUpPiece.color == Piece.WHITE)
pickedUpPiece.representation.setAttribute("src", "images/wpawn.png");
else
pickedUpPiece.representation.setAttribute("src", "images/bpawn.png");
}
}
else if (ep)
capture(pickedUpPiece, squares[pickedUpPiece.square.column - 1][pickedUpPiece.square.row - ((pickedUpPiece.color == Piece.WHITE) ? 2 : 0)].piece, oldSquare, true);
else
capture(pickedUpPiece, pickedUpPiece.square.piece, oldSquare, false);
}
else{
var newMoveString = "";
if (pickedUpPiece.color == Piece.WHITE)
newMoveString += (move + ". ");
else
newMoveString += "   ";
pickedUpPiece.square.piece = pickedUpPiece;
pickedUpPiece.representation.style.left = pickedUpPiece.square.coordinates.x + "px";
pickedUpPiece.representation.style.top = pickedUpPiece.square.coordinates.y + "px";
turn = (turn) ? false : true;
if (!pickedUpPiece.hasMoved && pickedUpPiece.type == Piece.KING && (pickedUpPiece.square.column == 7 || pickedUpPiece.square.column == 3)){
if (pickedUpPiece.square.column == 3){ //Queenside Castle
if (pickedUpPiece.color == Piece.WHITE){
wr1.square.piece = null;
wr1.square = squares[3][0];
wr1.square.piece = wr1;
wr1.hasMoved = true;
wr1.representation.style.left = wr1.square.coordinates.x + "px";
wr1.representation.style.top = wr1.square.coordinates.y + "px";
newMoveString += "0-0-0";
}
else if (pickedUpPiece.color == Piece.BLACK){
br1.square.piece = null;
br1.square = squares[3][7];
br1.square.piece = br1;
br1.hasMoved = true;
br1.representation.style.left = br1.square.coordinates.x + "px";
br1.representation.style.top = br1.square.coordinates.y + "px";
newMoveString += "0-0-0";
}
}
if (pickedUpPiece.square.column == 7){ //Kingside Castle
if (pickedUpPiece.color == Piece.WHITE){
wr2.square.piece = null;
wr2.square = squares[5][0];
wr2.square.piece = wr2;
wr2.hasMoved = true;
wr2.representation.style.left = wr2.square.coordinates.x + "px";
wr2.representation.style.top = wr2.square.coordinates.y + "px";
newMoveString += "0-0";
}
else if (pickedUpPiece.color == Piece.BLACK){
br2.square.piece = null;
br2.square = squares[5][7];
br2.square.piece = br2;
br2.hasMoved = true;
br2.representation.style.left = br2.square.coordinates.x + "px";
br2.representation.style.top = br2.square.coordinates.y + "px";
newMoveString += "0-0";
}
}
}
else{
switch (pickedUpPiece.type){
case 0:
newMoveString += "";
break;
case 1:
newMoveString += "N";
break;
case 2:
newMoveString += "B";
break;
case 3:
newMoveString += "R";
break;
case 4:
newMoveString += "Q";
break;
case 5:
newMoveString += "K";
break;
}
newMoveString += String.fromCharCode(96 + pickedUpPiece.square.column);
newMoveString += pickedUpPiece.square.row;
}
if (pickedUpPiece.type == Piece.PAWN && Math.abs(pickedUpPiece.square.row - oldSquare.row) != 1){
if ((pickedUpPiece.square.column > 1)
&& squares[pickedUpPiece.square.column - 2][pickedUpPiece.square.row - 1].piece != null
&& squares[pickedUpPiece.square.column - 2][pickedUpPiece.square.row - 1].piece.color != pickedUpPiece.color
&& squares[pickedUpPiece.square.column - 2][pickedUpPiece.square.row - 1].piece.type == Piece.PAWN)
squares[pickedUpPiece.square.column - 2][pickedUpPiece.square.row - 1].piece.epright = true;
if ((pickedUpPiece.square.column < 7)
&& squares[pickedUpPiece.square.column][pickedUpPiece.square.row - 1].piece != null
&& squares[pickedUpPiece.square.column][pickedUpPiece.square.row - 1].piece.color != pickedUpPiece.color
&& squares[pickedUpPiece.square.column][pickedUpPiece.square.row - 1].piece.type == Piece.PAWN)
squares[pickedUpPiece.square.column][pickedUpPiece.square.row - 1].piece.epleft = true;
}
pickedUpPiece.hasMoved = true;
checkEnd(Math.abs(pickedUpPiece.color - 1));
if (checkmate)
newMoveString += "#";
else if (check)
newMoveString += "+";
if (pickedUpPiece.color == Piece.BLACK) newMoveString += "<br />";
if (pickedUpPiece.color == Piece.WHITE){
var node = whitePieces.head;
while (node != null){
if (node.contents != null){
node.contents.epleft = false;
node.contents.epright = false;
}
node = node.next;
}
}
else{
node = blackPieces.head;
while (node != null){
if (node.contents != null){
node.contents.epleft = false;
node.contents.epright = false;
}
node = node.next;
}
}
if (ep) pickedUpPiece.updateMoves();
listValidMoves(Piece.WHITE);
listValidMoves(Piece.BLACK);
moveList.innerHTML += newMoveString;
if (pickedUpPiece.color == Piece.BLACK) move++;
if (computerPlaysBlack && pickedUpPiece.color == Piece.WHITE)
computerMove();
else if (computerPlaysWhite && pickedUpPiece.color == Piece.BLACK)
computerMove();
}
}
else{
pickedUpPiece.square = oldSquare;
pickedUpPiece.square.piece = pickedUpPiece;
pickedUpPiece.representation.style.left = pickedUpPiece.square.coordinates.x + "px";
pickedUpPiece.representation.style.top = pickedUpPiece.square.coordinates.y + "px";
if (promoted){
pickedUpPiece.type = 0;
if (pickedUpPiece.color == Piece.WHITE)
pickedUpPiece.representation.setAttribute("src", "images/wpawn.png");
else
pickedUpPiece.representation.setAttribute("src", "images/bpawn.png");
}
}
}
function capture(winner, loser, from, ep){
var newMoveString = "";
if (pickedUpPiece.color == Piece.WHITE)
newMoveString += (move + ". ");
else
newMoveString += "   ";
switch (winner.type){
case 0:
newMoveString += String.fromCharCode(96 + from.column);
newMoveString += from.row;
break;
case 1:
newMoveString += "N";
break;
case 2:
newMoveString += "B";
break;
case 3:
newMoveString += "R";
break;
case 4:
newMoveString += "Q";
break;
case 5:
newMoveString += "K";
break;
}
newMoveString += "x";
newMoveString += String.fromCharCode(96 + loser.square.column);
newMoveString += loser.square.row;
if (ep)
newMoveString += " e.p.";
loser.square.piece = null;
loser.square = null;
document.body.removeChild(loser.representation);
loser.representation = null;
if (loser.color == Piece.WHITE)
whitePieces.remove(loser);
else
blackPieces.remove(loser);
winner.square.piece = winner;
winner.representation.style.left = winner.square.coordinates.x + "px";
winner.representation.style.top = winner.square.coordinates.y + "px";
winner.hasMoved = true;
turn = (turn) ? false : true;
listValidMoves(Piece.WHITE);
listValidMoves(Piece.BLACK);
checkEnd(Math.abs(winner.color - 1));
if (checkmate)
newMoveString += "#";
else if (check)
newMoveString += "+";
if (pickedUpPiece.color == Piece.BLACK) newMoveString += "<br />";
if (pickedUpPiece.color == Piece.WHITE){
var node = whitePieces.head;
while (node != null){
if (node.contents != null){
node.contents.epleft = false;
node.contents.epright = false;
}
node = node.next;
}
}
else{
node = blackPieces.head;
while (node != null){
if (node.contents != null){
node.contents.epleft = false;
node.contents.epright = false;
}
node = node.next;
}
}
if (ep) pickedUpPiece.updateMoves();
moveList.innerHTML += newMoveString;
if (pickedUpPiece.color == Piece.BLACK) move++;
if (computerPlaysBlack && pickedUpPiece.color == Piece.WHITE)
computerMove();
else if (computerPlaysWhite && pickedUpPiece.color == Piece.BLACK)
computerMove();
}
function checkValidMove(piece, square, tryCheck){
piece.updateMoves();
if (piece.available[square.column - 1][square.row - 1] > 0){
var oldSquare = piece.square;
var oldPiece = square.piece;
piece.square = square;
square.piece = piece;
oldSquare.piece = null;
if (finalize(piece.color, tryCheck))
return true;
else{
piece.square.piece = oldPiece;
piece.square = oldSquare;
oldSquare.piece = piece;
finalize(piece.color, false);
return false;
}
}
else
return false;
}
function finalize(color, tryCheck){
wkavail = wk.available[wk.square.column - 1][wk.square.row - 1];
bkavail = bk.available[bk.square.column - 1][bk.square.row - 1];
/* Figure out all the squares available to all the pieces now that the move has been made */
var node = whitePieces.head;
while (node != null){
node.contents.updateMoves();
node = node.next;
}
node = blackPieces.head;
while (node != null){
node.contents.updateMoves();
node = node.next;
}
if (tryCheck){
check = false;
checkmate = false;
}
/* Check all the squares available to all the enemy pieces. If any of them matches the king's square, it's an illegal move.
* Also, if the player is trying to castle, check the blank square as well as the square he/she is trying to move the king to.*/
var node = blackPieces.head;
while (node != null){
if (((node.contents.available[wk.square.column - 1][wk.square.row - 1] == 2 || node.contents.available[wk.square.column - 1][wk.square.row - 1] == -1) && node.contents.square.piece == node.contents)
|| ((wkavail == 3) && node.contents.available[5][0] == 2)
|| ((wkavail == 4) && node.contents.available[3][0] == 2)){
if (color == Piece.WHITE){
if (tryCheck)
console.log("Illegal move: Check");
return false;
}
else if (tryCheck){
check = true;
}
}
node = node.next;
}
var node = whitePieces.head;
while (node != null){
if (((node.contents.available[bk.square.column - 1][bk.square.row - 1] == 2 || node.contents.available[bk.square.column - 1][bk.square.row - 1] == -1) && node.contents.square.piece == node.contents)
|| ((bkavail == 3) && node.contents.available[5][7] == 2)
|| ((bkavail == 4) && node.contents.available[3][7] == 2)){
if (color == Piece.BLACK){
if (tryCheck)
console.log("Illegal move: Check");
return false;
}
else if (tryCheck){
check = true;
}
}
node = node.next;
}
return true;
}
var move = 1;
function checkEnd(color){
if (color == Piece.WHITE){
listValidMoves(Piece.WHITE);
if (whiteMoves.head == null){
if (check)
checkmate = true;
else
stalemate = true;
}
}
else{
listValidMoves(Piece.BLACK);
if (blackMoves.head == null){
if (check)
checkmate = true;
else
stalemate = true;
}
}
if (whitePieces.length <= 2 && blackPieces.length <= 2){
var whitePiece1 = whitePieces.head.contents.type;
var blackPiece1 = blackPieces.head.contents.type;
if (whitePieces.length == 1){
if (blackPieces.length == 1) //Both players have one piece
draw = true;
else{
var blackPiece2 = blackPieces.head.next.contents.type; //White has one piece and black has 2
if ((blackPiece1 == Piece.KNIGHT || blackPiece1 == Piece.BISHOP) || (blackPiece2 == Piece.KNIGHT || blackPiece2 == Piece.BISHOP))
draw = true;
}
}
else{
if (blackPieces.length == 1){ //Black has one piece and white has 2
var whitePiece2 = whitePieces.head.next.contents.type;
if ((whitePiece1 == Piece.KNIGHT || whitePiece1 == Piece.BISHOP) || (whitePiece2 == Piece.KNIGHT || whitePiece2 == Piece.BISHOP))
draw = true;
}
else{ //Both players have two pieces
var whitePiece2 = whitePieces.head.next.contents.type;
var blackPiece2 = blackPieces.head.next.contents.type;
if (((blackPiece1 == Piece.KNIGHT || blackPiece1 == Piece.BISHOP) || (blackPiece2 == Piece.KNIGHT || blackPiece2 == Piece.BISHOP))
&& ((whitePiece1 == Piece.KNIGHT || whitePiece1 == Piece.BISHOP) || (whitePiece2 == Piece.KNIGHT || whitePiece2 == Piece.BISHOP)))
draw = true;
}
}
}
if (checkmate || stalemate || draw){
computerPlaysBlack = false;
computerPlaysWhite = false;
gameOn = false;
totalMoves += move;
totalGames++;
totalBalance += getBoardValue();
if (checkmate)
totalCheckmates++;
if (stalemate)
totalStalemates++;
if (draw)
totalDraws++;
infoP.innerHTML = "So far " + totalGames + " games have been played.<br />The average game lasted " + (totalMoves / totalGames).toFixed(3) +
" moves<br />The average material balance at the end was " + (totalBalance / totalGames).toFixed(3) + "<br />" +
"There have been " + totalCheckmates + " decisive games and " + (totalStalemates + totalDraws) + " draws.<br />" +
"Of the draws, " + totalStalemates + " were stalemates, and " + totalDraws + " were from insufficient material.";
}
}
function printTestTable(piece){
for (var i = 7; i >= 0; i--){
console.log(piece.available[0][i] + " " + piece.available[1][i] + " " + piece.available[2][i] + " " + piece.available[3][i] + " " + piece.available[4][i] + " " + piece.available[5][i] + " " + piece.available[6][i] + " " + piece.available[7][i]);
}
}
function printBoard(){
for (var i = 7; i >= 0; i--){
console.log( ((squares[0][i].piece != null) ? squares[0][i].piece.type : "_") +
" " + ((squares[1][i].piece != null) ? squares[1][i].piece.type : "_") +
" " + ((squares[2][i].piece != null) ? squares[2][i].piece.type : "_") +
" " + ((squares[3][i].piece != null) ? squares[3][i].piece.type : "_") +
" " + ((squares[4][i].piece != null) ? squares[4][i].piece.type : "_") +
" " + ((squares[5][i].piece != null) ? squares[5][i].piece.type : "_") +
" " + ((squares[6][i].piece != null) ? squares[6][i].piece.type : "_") +
" " + ((squares[7][i].piece != null) ? squares[7][i].piece.type : "_"));
}
}
function debugEPs(){
var node = blackPieces.head;
while (node != null){
console.log(String.fromCharCode(96 + node.contents.square.column) + node.contents.square.row + " " + node.contents.epleft + " " + node.contents.epright);
node = node.next;
}
var node = whitePieces.head;
while (node != null){
console.log(String.fromCharCode(96 + node.contents.square.column) + node.contents.square.row + " " + node.contents.epleft + " " + node.contents.epright);
node = node.next;
}
}
function computerMove(){
if (!posGen || move <= movesToPlay){
if (!turn){
listValidMoves(Piece.BLACK);
var randomMoveSteps = Math.floor(Math.random() * blackMoves.length);
var node = blackMoves.head;
if (node != null){
while (randomMoveSteps != 0){
node = node.next;
randomMoveSteps--;
}
pickedUpPiece = node.contents.piece;
movePiece(node.contents.square);
pickedUp = false;
pickedUpPiece = null;
}
}
else{
listValidMoves(Piece.WHITE);
var randomMoveSteps = Math.floor(Math.random() * whiteMoves.length);
var node = whiteMoves.head;
if (node != null){
while (randomMoveSteps != 0){
node = node.next;
randomMoveSteps--;
}
pickedUpPiece = node.contents.piece;
movePiece(node.contents.square);
pickedUp = false;
pickedUpPiece = null;
}
}
}
}
/* Draw the board in the browser */
var board = document.createElement("table");
board.setAttribute("width", "400px");
board.setAttribute("height", "400px");
board.style.borderSpacing = 0;
board.style.borderCollapse = true;
for (var i = 1; i <= 8; i++){
var row = document.createElement("tr");
board.appendChild(row);
for (var j = 1; j <= 8; j++){
var cell = document.createElement("td");
row.appendChild(cell);
cell.style.borderWidth = "0px";
if ((i + j) % 2 == 0)
cell.style.backgroundColor = "rgb(245, 245, 245)";
else
cell.style.backgroundColor = "rgb(200, 200, 200)";
}
}
board.style.position = "absolute";
board.style.left = "0px";
board.style.top = "0px";
document.body.appendChild(board);
var moveListDiv = document.createElement("div");
moveListDiv.setAttribute("width", "200px");
moveListDiv.style.position = "absolute";
moveListDiv.style.left = "410px";
document.body.appendChild(moveListDiv);
var moveList = document.createElement("p");
moveList.style.top = "0px";
moveList.style.font = "14px 'American Typewriter Condensed Light', Tacoma, Arial, sans-serif";
moveListDiv.appendChild(moveList);
var instrDiv = document.createElement("div");
instrDiv.style.width = "630px";
instrDiv.style.height = "200px";
instrDiv.style.position = "absolute";
instrDiv.style.left = "620px";
document.body.appendChild(instrDiv);
var instrP = document.createElement("p");
instrP.style.width = "630px";
instrP.style.font = "11px 'American Typewriter Condensed Light', Tacoma, Arial, sans-serif";
instrP.style.textShadow = "0px 0px 0px #555";
instrDiv.appendChild(instrP);
instrP.innerHTML = "INSTRUCTIONS<br />" +
"This board can be used to play against a friend or to set up a position by turning both computers off.<br />" +
"The computers make random moves, so turn one on to play against a random-move-making opponent.<br />" +
"Press 'Full Game' (or turn both computers on) to make the computers generate a completely random chess game.<br />" +
"<br />This web page can be used to generate random positions for chess games, creating a fun way to avoid opening theory.<br />" +
"Set the number of random moves for each side to be played to generate the starting position and press 'New Position' to generate.<br />" +
"To limit the advantage that one side can have, use the two counters at the bottom and the checkboxes.<br />" +
"For example, if white can have at most a pawn advantage, set that counter to 1. To not care, turn it off or set it to 40.<br />" +
"These counters can go negative to force one side to have a disadvantage.<br />" +
"For example, set black's counter to -3 to state that black must have a disadvantage of at least three pawns.<br />" +
"The chess engine on this web page does not respect the 50 move rule or threefold repetition, and always promotes to a queen.<br />" +
"<br />By Andrew Latham, May 2012";
var gameDiv = document.createElement("div");
gameDiv.style.width = "300px";
gameDiv.style.height = "250px";
gameDiv.style.border = "3px solid black";
gameDiv.style.position = "absolute";
gameDiv.style.left = "620px";
gameDiv.style.top = "250px";
document.body.appendChild(gameDiv);
var blackButton = document.createElement("button");
blackButton.innerHTML = "Black computer is on";
blackButton.onclick = function(){
if (computerPlaysBlack){
blackButton.innerHTML = "Black computer is off";
computerPlaysBlack = false;
}
else{
blackButton.innerHTML = "Black computer is on";
computerPlaysBlack = true;
if (!turn) computerMove();
}
};
blackButton.style.position = "absolute";
blackButton.setAttribute("width", "200px");
blackButton.style.left = "5px";
blackButton.style.top = "5px";
gameDiv.appendChild(blackButton);
var whiteButton = document.createElement("button");
whiteButton.innerHTML = "White computer is off";
whiteButton.onclick = function(){
if (computerPlaysWhite){
whiteButton.innerHTML = "White computer is off";
computerPlaysWhite = false;
}
else{
whiteButton.innerHTML = "White computer is on";
computerPlaysWhite = true;
if (turn) computerMove();
}
};
whiteButton.style.position = "absolute";
whiteButton.setAttribute("width", "200px");
whiteButton.style.left = "5px";
whiteButton.style.top = "35px";
gameDiv.appendChild(whiteButton);
var resetButton = document.createElement("button");
resetButton.innerHTML = "Reset";
resetButton.onclick = function(){
computerPlaysBlack = false;
computerPlaysWhite = false;
whiteButton.innerHTML = "White computer is off";
blackButton.innerHTML = "Black computer is off";
moveList.innerHTML = "";
turn = true;
for (var i = 0; i < 8; i++)
for (var j = 0; j < 8; j++){
squares[i][j].piece = null;
}
if (wp1.representation != null) document.body.removeChild(img_wp1);
if (wp2.representation != null) document.body.removeChild(img_wp2);
if (wp3.representation != null) document.body.removeChild(img_wp3);
if (wp4.representation != null) document.body.removeChild(img_wp4);
if (wp5.representation != null) document.body.removeChild(img_wp5);
if (wp6.representation != null) document.body.removeChild(img_wp6);
if (wp7.representation != null) document.body.removeChild(img_wp7);
if (wp8.representation != null) document.body.removeChild(img_wp8);
if (wn1.representation != null) document.body.removeChild(img_wn1);
if (wn2.representation != null) document.body.removeChild(img_wn2);
if (wb1.representation != null) document.body.removeChild(img_wb1);
if (wb2.representation != null) document.body.removeChild(img_wb2);
if (wr1.representation != null) document.body.removeChild(img_wr1);
if (wr2.representation != null) document.body.removeChild(img_wr2);
if (wq.representation != null) document.body.removeChild(img_wq);
if (wk.representation != null) document.body.removeChild(img_wk);
if (bp1.representation != null) document.body.removeChild(img_bp1);
if (bp2.representation != null) document.body.removeChild(img_bp2);
if (bp3.representation != null) document.body.removeChild(img_bp3);
if (bp4.representation != null) document.body.removeChild(img_bp4);
if (bp5.representation != null) document.body.removeChild(img_bp5);
if (bp6.representation != null) document.body.removeChild(img_bp6);
if (bp7.representation != null) document.body.removeChild(img_bp7);
if (bp8.representation != null) document.body.removeChild(img_bp8);
if (bn1.representation != null) document.body.removeChild(img_bn1);
if (bn2.representation != null) document.body.removeChild(img_bn2);
if (bb1.representation != null) document.body.removeChild(img_bb1);
if (bb2.representation != null) document.body.removeChild(img_bb2);
if (br1.representation != null) document.body.removeChild(img_br1);
if (br2.representation != null) document.body.removeChild(img_br2);
if (bq.representation != null) document.body.removeChild(img_bq);
if (bk.representation != null) document.body.removeChild(img_bk);
pieceImages = [];
img_wp1 = document.createElement("img");
img_wp2 = document.createElement("img");
img_wp3 = document.createElement("img");
img_wp4 = document.createElement("img");
img_wp5 = document.createElement("img");
img_wp6 = document.createElement("img");
img_wp7 = document.createElement("img");
img_wp8 = document.createElement("img");
img_wn1 = document.createElement("img");
img_wn2 = document.createElement("img");
img_wb1 = document.createElement("img");
img_wb2 = document.createElement("img");
img_wr1 = document.createElement("img");
img_wr2 = document.createElement("img");
img_wq = document.createElement("img");
img_wk = document.createElement("img");
img_bp1 = document.createElement("img");
img_bp2 = document.createElement("img");
img_bp3 = document.createElement("img");
img_bp4 = document.createElement("img");
img_bp5 = document.createElement("img");
img_bp6 = document.createElement("img");
img_bp7 = document.createElement("img");
img_bp8 = document.createElement("img");
img_bn1 = document.createElement("img");
img_bn2 = document.createElement("img");
img_bb1 = document.createElement("img");
img_bb2 = document.createElement("img");
img_br1 = document.createElement("img");
img_br2 = document.createElement("img");
img_bq = document.createElement("img");
img_bk = document.createElement("img");
pieceImages.push(img_wp1, img_wp2, img_wp3, img_wp4, img_wp5, img_wp6, img_wp7, img_wp8,
img_wn1, img_wn2, img_wb1, img_wb2, img_wr1, img_wr2, img_wq, img_wk,
img_bp1, img_bp2, img_bp3, img_bp4, img_bp5, img_bp6, img_bp7, img_bp8,
img_bn1, img_bn2, img_bb1, img_bb2, img_br1, img_br2, img_bq, img_bk);
for (var i = 0; i < 32; i++){
if (i < 8)
pieceImages[i].setAttribute("src", "images/wpawn.png");
else if (i < 10)
pieceImages[i].setAttribute("src", "images/wknight.png");
else if (i < 12)
pieceImages[i].setAttribute("src", "images/wbishop.png");
else if (i < 14)
pieceImages[i].setAttribute("src", "images/wrook.png");
else if (i == 14)
pieceImages[i].setAttribute("src", "images/wqueen.png");
else if (i == 15)
pieceImages[i].setAttribute("src", "images/wking.png");
else if (i < 24)
pieceImages[i].setAttribute("src", "images/bpawn.png");
else if (i < 26)
pieceImages[i].setAttribute("src", "images/bknight.png");
else if (i < 28)
pieceImages[i].setAttribute("src", "images/bbishop.png");
else if (i < 30)
pieceImages[i].setAttribute("src", "images/brook.png");
else if (i == 30)
pieceImages[i].setAttribute("src", "images/bqueen.png");
else if (i == 31)
pieceImages[i].setAttribute("src", "images/bking.png");
pieceImages[i].setAttribute("width", "50px");
pieceImages[i].setAttribute("height", "50px");
pieceImages[i].style.position = "absolute";
if (Math.floor(i / 8) % 2 == 0)
pieceImages[i].style.left = 50 * (i % 8) + "px";
else
switch (i % 8){
case 0:
pieceImages[i].style.left = "50px";
break;
case 1:
pieceImages[i].style.left = "300px";
break;
case 2:
pieceImages[i].style.left = "100px";
break;
case 3:
pieceImages[i].style.left = "250px";
break;
case 4:
pieceImages[i].style.left = "0px";
break;
case 5:
pieceImages[i].style.left = "350px";
break;
case 6:
pieceImages[i].style.left = "150px";
break;
case 7:
pieceImages[i].style.left = "200px";
break;
}
if (i < 8)
pieceImages[i].style.top = "300px";
else if (i < 16)
pieceImages[i].style.top = "350px";
else if (i < 24)
pieceImages[i].style.top = "50px";
else
pieceImages[i].style.top = "0px";
document.body.appendChild(pieceImages[i]);
}
wp1 = new Piece(Piece.WHITE, Piece.PAWN, img_wp1, a2);
wp2 = new Piece(Piece.WHITE, Piece.PAWN, img_wp2, b2);
wp3 = new Piece(Piece.WHITE, Piece.PAWN, img_wp3, c2);
wp4 = new Piece(Piece.WHITE, Piece.PAWN, img_wp4, d2);
wp5 = new Piece(Piece.WHITE, Piece.PAWN, img_wp5, e2);
wp6 = new Piece(Piece.WHITE, Piece.PAWN, img_wp6, f2);
wp7 = new Piece(Piece.WHITE, Piece.PAWN, img_wp7, g2);
wp8 = new Piece(Piece.WHITE, Piece.PAWN, img_wp8, h2);
wr1 = new Piece(Piece.WHITE, Piece.ROOK, img_wr1, a1);
wn1 = new Piece(Piece.WHITE, Piece.KNIGHT, img_wn1, b1);
wb1 = new Piece(Piece.WHITE, Piece.BISHOP, img_wb1, c1);
wq = new Piece(Piece.WHITE, Piece.QUEEN, img_wq, d1);
wk = new Piece(Piece.WHITE, Piece.KING, img_wk, e1);
wb2 = new Piece(Piece.WHITE, Piece.BISHOP, img_wb2, f1);
wn2 = new Piece(Piece.WHITE, Piece.KNIGHT, img_wn2, g1);
wr2 = new Piece(Piece.WHITE, Piece.ROOK, img_wr2, h1);
bp1 = new Piece(Piece.BLACK, Piece.PAWN, img_bp1, a7);
bp2 = new Piece(Piece.BLACK, Piece.PAWN, img_bp2, b7);
bp3 = new Piece(Piece.BLACK, Piece.PAWN, img_bp3, c7);
bp4 = new Piece(Piece.BLACK, Piece.PAWN, img_bp4, d7);
bp5 = new Piece(Piece.BLACK, Piece.PAWN, img_bp5, e7);
bp6 = new Piece(Piece.BLACK, Piece.PAWN, img_bp6, f7);
bp7 = new Piece(Piece.BLACK, Piece.PAWN, img_bp7, g7);
bp8 = new Piece(Piece.BLACK, Piece.PAWN, img_bp8, h7);
br1 = new Piece(Piece.BLACK, Piece.ROOK, img_br1, a8);
bn1 = new Piece(Piece.BLACK, Piece.KNIGHT, img_bn1, b8);
bb1 = new Piece(Piece.BLACK, Piece.BISHOP, img_bb1, c8);
bq = new Piece(Piece.BLACK, Piece.QUEEN, img_bq, d8);
bk = new Piece(Piece.BLACK, Piece.KING, img_bk, e8);
bb2 = new Piece(Piece.BLACK, Piece.BISHOP, img_bb2, f8);
bn2 = new Piece(Piece.BLACK, Piece.KNIGHT, img_bn2, g8);
br2 = new Piece(Piece.BLACK, Piece.ROOK, img_br2, h8);
whitePieces = new LinkedList();
blackPieces = new LinkedList();
whitePieces.add(wp1);
whitePieces.add(wp2);
whitePieces.add(wp3);
whitePieces.add(wp4);
whitePieces.add(wp5);
whitePieces.add(wp6);
whitePieces.add(wp7);
whitePieces.add(wp8);
whitePieces.add(wr1);
whitePieces.add(wr2);
whitePieces.add(wn1);
whitePieces.add(wn2);
whitePieces.add(wb1);
whitePieces.add(wb2);
whitePieces.add(wq);
whitePieces.add(wk);
blackPieces.add(bp1);
blackPieces.add(bp2);
blackPieces.add(bp3);
blackPieces.add(bp4);
blackPieces.add(bp5);
blackPieces.add(bp6);
blackPieces.add(bp7);
blackPieces.add(bp8);
blackPieces.add(br1);
blackPieces.add(br2);
blackPieces.add(bn1);
blackPieces.add(bn2);
blackPieces.add(bb1);
blackPieces.add(bb2);
blackPieces.add(bq);
blackPieces.add(bk);
whiteMoves = new LinkedList(null);
blackMoves = new LinkedList(null);
listValidMoves(Piece.WHITE);
listValidMoves(Piece.BLACK);
pickedUp = false;
pickedUpPiece = null;
check = false;
checkmate = false;
stalemate = false;
draw = false;
gameOn = true;
move = 1;
};
resetButton.setAttribute("width", "100px");
resetButton.style.position = "absolute";
resetButton.style.left = "150px";
resetButton.style.top = "20px";
gameDiv.appendChild(resetButton);
var genGameButton = document.createElement("button");
genGameButton.setAttribute("width", "100px");
genGameButton.innerHTML = "Full Game";
genGameButton.style.position = "absolute";
genGameButton.style.left = "210px";
genGameButton.style.top = "20px";
genGameButton.onclick = function(){
resetButton.click();
blackButton.click();
whiteButton.click();
};
gameDiv.appendChild(genGameButton);
var movesToPlay = 10;
var posGen = false;
var whiteMaxAdv = 1;
var blackMaxAdv = 1;
var newGameButton = document.createElement("button");
newGameButton.setAttribute("width", "200px");
newGameButton.innerHTML = "New position after 10 moves";
newGameButton.style.position = "absolute";
newGameButton.style.left = "5px";
newGameButton.style.top = "100px";
newGameButton.onclick = function(){
do{
resetButton.click();
posGen = true;
computerPlaysWhite = true;
computerPlaysBlack = true;
computerMove();
computerPlaysWhite = false;
computerPlaysBlack = false;
posGen = false;
} while (((whiteMax.checked == true) && (getBoardValue() > whiteMaxAdv)) || ((blackMax.checked == true) && (getBoardValue() < (-1 * blackMaxAdv))))
};
gameDiv.appendChild(newGameButton);
function getBoardValue(){
var value = 0;
var node = whitePieces.head;
while (node != null){
var piece = node.contents.type;
switch(piece){
case Piece.PAWN:
value += 1;
break;
case Piece.KNIGHT:
value += 3;
break;
case Piece.BISHOP:
value += 3;
break;
case Piece.ROOK:
value += 5;
break;
case Piece.QUEEN:
value += 10;
break;
}
node = node.next;
}
var node = blackPieces.head;
while (node != null){
var piece = node.contents.type;
switch(piece){
case Piece.PAWN:
value -= 1;
break;
case Piece.KNIGHT:
value -= 3;
break;
case Piece.BISHOP:
value -= 3;
break;
case Piece.ROOK:
value -= 5;
break;
case Piece.QUEEN:
value -= 10;
break;
}
node = node.next;
}
return value;
}
var movesBox = document.createElement("input");
movesBox.setAttribute("type", "text");
movesBox.setAttribute("size", 3);
movesBox.setAttribute("maxlength", 3);
movesBox.setAttribute("value", "10");
movesBox.style.position = "absolute";
movesBox.style.left = "220px";
movesBox.style.top = "100px";
movesBox.onchange = function(){
if (isNumber(movesBox.value) && (0 < Math.floor(movesBox.value)) && (Math.floor(movesBox.value) <= 999)){
movesToPlay = Math.floor(movesBox.value);
newGameButton.innerHTML = "New position after " + movesToPlay + " moves";
movesBox.value = movesToPlay;
movesBox.blur();
}
else
movesBox.value = movesToPlay;
};
movesBox.onfocus = function(){movesBox.setAttribute("value", "");};
gameDiv.appendChild(movesBox);
var whiteMax = document.createElement("input");
whiteMax.setAttribute("type", "checkbox");
whiteMax.setAttribute("checked", false);
whiteMax.style.position = "absolute";
whiteMax.style.left = "5px";
whiteMax.style.top = "150px";
gameDiv.appendChild(whiteMax);
var whiteMaxSpan = document.createElement("span");
whiteMaxSpan.innerHTML = "White is up at most 1 points in material";
whiteMaxSpan.style.position = "absolute";
whiteMaxSpan.style.left = "25px";
whiteMaxSpan.style.top = "152px";
whiteMaxSpan.style.fontShadow = "0px 0px 0px #555";
whiteMaxSpan.style.fontSize = "12px";
gameDiv.appendChild(whiteMaxSpan);
var whiteBox = document.createElement("input");
whiteBox.setAttribute("type", "text");
whiteBox.setAttribute("size", 3);
whiteBox.setAttribute("maxlength", 3);
whiteBox.setAttribute("value", "1");
whiteBox.style.position = "absolute";
whiteBox.style.left = "250px";
whiteBox.style.top = "150px";
whiteBox.onchange = function(){
if (isNumber(whiteBox.value) && (-40 < Math.floor(whiteBox.value)) && (Math.floor(whiteBox.value) <= 50)){
whiteMaxAdv = Math.floor(whiteBox.value);
whiteMaxSpan.innerHTML = "White is up at most " + whiteMaxAdv + " points in material";
whiteBox.value = whiteMaxAdv;
whiteBox.blur();
}
else
whiteBox.value = whiteMaxAdv;
};
whiteBox.onfocus = function(){whiteBox.setAttribute("value", "");};
gameDiv.appendChild(whiteBox);
var blackMax = document.createElement("input");
blackMax.setAttribute("type", "checkbox");
blackMax.setAttribute("checked", false);
blackMax.style.position = "absolute";
blackMax.style.left = "5px";
blackMax.style.top = "200px";
gameDiv.appendChild(blackMax);
var blackMaxSpan = document.createElement("span");
blackMaxSpan.innerHTML = "Black is up at most 1 points in material";
blackMaxSpan.style.position = "absolute";
blackMaxSpan.style.left = "25px";
blackMaxSpan.style.fontShadow = "0px 0px 0px #555";
blackMaxSpan.style.top = "202px";
blackMaxSpan.style.fontSize = "12px";
gameDiv.appendChild(blackMaxSpan);
var blackBox = document.createElement("input");
blackBox.setAttribute("type", "text");
blackBox.setAttribute("size", 3);
blackBox.setAttribute("maxlength", 3);
blackBox.setAttribute("value", "1");
blackBox.style.position = "absolute";
blackBox.style.left = "250px";
blackBox.style.top = "200px";
blackBox.onchange = function(){
if (isNumber(blackBox.value) && (-40 < Math.floor(blackBox.value)) && (Math.floor(blackBox.value) <= 50)){
blackMaxAdv = Math.floor(blackBox.value);
blackMaxSpan.innerHTML = "Black is up at most " + blackMaxAdv + " points in material";
blackBox.value = blackMaxAdv;
blackBox.blur();
}
else
blackBox.value = blackMaxAdv;
};
blackBox.onfocus = function(){blackBox.setAttribute("value", "");};
gameDiv.appendChild(blackBox);
var infoDiv = document.createElement("div");
infoDiv.setAttribute("width", "300px");
infoDiv.style.position = "absolute";
infoDiv.style.left = "620px";
infoDiv.style.top = "510px";
infoDiv.style.font = "18px Tacoma, Helvetica, Arial, sans-serif";
infoDiv.style.textShadow = "0px 1px 2px #555";
document.body.appendChild(infoDiv);
var infoP = document.createElement("p");
infoP.innerHTML = "So far 0 games have been played.<br />The average game lasted 0 moves<br />The average material balance at the end was 0<br />" +
"There have been 0 decisive games and 0 draws.<br />Of the draws, 0 were stalemates, and 0 were from insufficient material.";
infoDiv.appendChild(infoP);
function isNumber(n) { //Credit to "CMS" on StackOverflow
return !isNaN(parseFloat(n)) && isFinite(n);
}
/* Initialize all the image elements for the pieces, put the pieces in them, and set the board up properly */
var pieceImages = [];
var img_wp1 = document.createElement("img");
var img_wp2 = document.createElement("img");
var img_wp3 = document.createElement("img");
var img_wp4 = document.createElement("img");
var img_wp5 = document.createElement("img");
var img_wp6 = document.createElement("img");
var img_wp7 = document.createElement("img");
var img_wp8 = document.createElement("img");
var img_wn1 = document.createElement("img");
var img_wn2 = document.createElement("img");
var img_wb1 = document.createElement("img");
var img_wb2 = document.createElement("img");
var img_wr1 = document.createElement("img");
var img_wr2 = document.createElement("img");
var img_wq = document.createElement("img");
var img_wk = document.createElement("img");
var img_bp1 = document.createElement("img");
var img_bp2 = document.createElement("img");
var img_bp3 = document.createElement("img");
var img_bp4 = document.createElement("img");
var img_bp5 = document.createElement("img");
var img_bp6 = document.createElement("img");
var img_bp7 = document.createElement("img");
var img_bp8 = document.createElement("img");
var img_bn1 = document.createElement("img");
var img_bn2 = document.createElement("img");
var img_bb1 = document.createElement("img");
var img_bb2 = document.createElement("img");
var img_br1 = document.createElement("img");
var img_br2 = document.createElement("img");
var img_bq = document.createElement("img");
var img_bk = document.createElement("img");
pieceImages.push(img_wp1, img_wp2, img_wp3, img_wp4, img_wp5, img_wp6, img_wp7, img_wp8,
img_wn1, img_wn2, img_wb1, img_wb2, img_wr1, img_wr2, img_wq, img_wk,
img_bp1, img_bp2, img_bp3, img_bp4, img_bp5, img_bp6, img_bp7, img_bp8,
img_bn1, img_bn2, img_bb1, img_bb2, img_br1, img_br2, img_bq, img_bk);
for (var i = 0; i < 32; i++){
if (i < 8)
pieceImages[i].setAttribute("src", "images/wpawn.png");
else if (i < 10)
pieceImages[i].setAttribute("src", "images/wknight.png");
else if (i < 12)
pieceImages[i].setAttribute("src", "images/wbishop.png");
else if (i < 14)
pieceImages[i].setAttribute("src", "images/wrook.png");
else if (i == 14)
pieceImages[i].setAttribute("src", "images/wqueen.png");
else if (i == 15)
pieceImages[i].setAttribute("src", "images/wking.png");
else if (i < 24)
pieceImages[i].setAttribute("src", "images/bpawn.png");
else if (i < 26)
pieceImages[i].setAttribute("src", "images/bknight.png");
else if (i < 28)
pieceImages[i].setAttribute("src", "images/bbishop.png");
else if (i < 30)
pieceImages[i].setAttribute("src", "images/brook.png");
else if (i == 30)
pieceImages[i].setAttribute("src", "images/bqueen.png");
else if (i == 31)
pieceImages[i].setAttribute("src", "images/bking.png");
pieceImages[i].setAttribute("width", "50px");
pieceImages[i].setAttribute("height", "50px");
pieceImages[i].style.position = "absolute";
if (Math.floor(i / 8) % 2 == 0)
pieceImages[i].style.left = 50 * (i % 8) + "px";
else
switch (i % 8){
case 0:
pieceImages[i].style.left = "50px";
break;
case 1:
pieceImages[i].style.left = "300px";
break;
case 2:
pieceImages[i].style.left = "100px";
break;
case 3:
pieceImages[i].style.left = "250px";
break;
case 4:
pieceImages[i].style.left = "0px";
break;
case 5:
pieceImages[i].style.left = "350px";
break;
case 6:
pieceImages[i].style.left = "150px";
break;
case 7:
pieceImages[i].style.left = "200px";
break;
}
if (i < 8)
pieceImages[i].style.top = "300px";
else if (i < 16)
pieceImages[i].style.top = "350px";
else if (i < 24)
pieceImages[i].style.top = "50px";
else
pieceImages[i].style.top = "0px";
document.body.appendChild(pieceImages[i]);
}
/* Define all the squares */
var a1 = new Square(1, 1);
var a2 = new Square(1, 2);
var a3 = new Square(1, 3);
var a4 = new Square(1, 4);
var a5 = new Square(1, 5);
var a6 = new Square(1, 6);
var a7 = new Square(1, 7);
var a8 = new Square(1, 8);
var b1 = new Square(2, 1);
var b2 = new Square(2, 2);
var b3 = new Square(2, 3);
var b4 = new Square(2, 4);
var b5 = new Square(2, 5);
var b6 = new Square(2, 6);
var b7 = new Square(2, 7);
var b8 = new Square(2, 8);
var c1 = new Square(3, 1);
var c2 = new Square(3, 2);
var c3 = new Square(3, 3);
var c4 = new Square(3, 4);
var c5 = new Square(3, 5);
var c6 = new Square(3, 6);
var c7 = new Square(3, 7);
var c8 = new Square(3, 8);
var d1 = new Square(4, 1);
var d2 = new Square(4, 2);
var d3 = new Square(4, 3);
var d4 = new Square(4, 4);
var d5 = new Square(4, 5);
var d6 = new Square(4, 6);
var d7 = new Square(4, 7);
var d8 = new Square(4, 8);
var e1 = new Square(5, 1);
var e2 = new Square(5, 2);
var e3 = new Square(5, 3);
var e4 = new Square(5, 4);
var e5 = new Square(5, 5);
var e6 = new Square(5, 6);
var e7 = new Square(5, 7);
var e8 = new Square(5, 8);
var f1 = new Square(6, 1);
var f2 = new Square(6, 2);
var f3 = new Square(6, 3);
var f4 = new Square(6, 4);
var f5 = new Square(6, 5);
var f6 = new Square(6, 6);
var f7 = new Square(6, 7);
var f8 = new Square(6, 8);
var g1 = new Square(7, 1);
var g2 = new Square(7, 2);
var g3 = new Square(7, 3);
var g4 = new Square(7, 4);
var g5 = new Square(7, 5);
var g6 = new Square(7, 6);
var g7 = new Square(7, 7);
var g8 = new Square(7, 8);
var h1 = new Square(8, 1);
var h2 = new Square(8, 2);
var h3 = new Square(8, 3);
var h4 = new Square(8, 4);
var h5 = new Square(8, 5);
var h6 = new Square(8, 6);
var h7 = new Square(8, 7);
var h8 = new Square(8, 8);
var squares = [
[a1, a2, a3, a4, a5, a6, a7, a8],
[b1, b2, b3, b4, b5, b6 ,b7, b8],
[c1, c2, c3, c4, c5, c6, c7, c8],
[d1, d2, d3, d4, d5, d6, d7, d8],
[e1, e2, e3, e4, e5, e6, e7, e8],
[f1, f2, f3, f4, f5, f6, f7, f8],
[g1, g2, g3, g4, g5, g6, g7, g8],
[h1, h2, h3, h4, h5, h6, h7, h8]
];
var wp1 = new Piece(Piece.WHITE, Piece.PAWN, img_wp1, a2);
a2.piece = wp1;
var wp2 = new Piece(Piece.WHITE, Piece.PAWN, img_wp2, b2);
b2.piece = wp2;
var wp3 = new Piece(Piece.WHITE, Piece.PAWN, img_wp3, c2);
c2.piece = wp3;
var wp4 = new Piece(Piece.WHITE, Piece.PAWN, img_wp4, d2);
d2.piece = wp4;
var wp5 = new Piece(Piece.WHITE, Piece.PAWN, img_wp5, e2);
e2.piece = wp5;
var wp6 = new Piece(Piece.WHITE, Piece.PAWN, img_wp6, f2);
f2.piece = wp6;
var wp7 = new Piece(Piece.WHITE, Piece.PAWN, img_wp7, g2);
g2.piece = wp7;
var wp8 = new Piece(Piece.WHITE, Piece.PAWN, img_wp8, h2);
h2.piece = wp8;
var wr1 = new Piece(Piece.WHITE, Piece.ROOK, img_wr1, a1);
a1.piece = wr1;
var wn1 = new Piece(Piece.WHITE, Piece.KNIGHT, img_wn1, b1);
b1.piece = wn1;
var wb1 = new Piece(Piece.WHITE, Piece.BISHOP, img_wb1, c1);
c1.piece = wb1;
var wq = new Piece(Piece.WHITE, Piece.QUEEN, img_wq, d1);
d1.piece = wq;
var wk = new Piece(Piece.WHITE, Piece.KING, img_wk, e1);
e1.piece = wk;
var wb2 = new Piece(Piece.WHITE, Piece.BISHOP, img_wb2, f1);
f1.piece = wb2;
var wn2 = new Piece(Piece.WHITE, Piece.KNIGHT, img_wn2, g1);
g1.piece = wn2;
var wr2 = new Piece(Piece.WHITE, Piece.ROOK, img_wr2, h1);
h1.piece = wr2;
var bp1 = new Piece(Piece.BLACK, Piece.PAWN, img_bp1, a7);
a7.piece = bp1;
var bp2 = new Piece(Piece.BLACK, Piece.PAWN, img_bp2, b7);
b7.piece = bp2;
var bp3 = new Piece(Piece.BLACK, Piece.PAWN, img_bp3, c7);
c7.piece = bp3;
var bp4 = new Piece(Piece.BLACK, Piece.PAWN, img_bp4, d7);
d7.piece = bp4;
var bp5 = new Piece(Piece.BLACK, Piece.PAWN, img_bp5, e7);
e7.piece = bp5;
var bp6 = new Piece(Piece.BLACK, Piece.PAWN, img_bp6, f7);
f7.piece = bp6;
var bp7 = new Piece(Piece.BLACK, Piece.PAWN, img_bp7, g7);
g7.piece = bp7;
var bp8 = new Piece(Piece.BLACK, Piece.PAWN, img_bp8, h7);
h7.piece = bp8;
var br1 = new Piece(Piece.BLACK, Piece.ROOK, img_br1, a8);
a8.piece = br1;
var bn1 = new Piece(Piece.BLACK, Piece.KNIGHT, img_bn1, b8);
b8.piece = bn1;
var bb1 = new Piece(Piece.BLACK, Piece.BISHOP, img_bb1, c8);
c8.piece = bb1;
var bq = new Piece(Piece.BLACK, Piece.QUEEN, img_bq, d8);
d8.piece = bq;
var bk = new Piece(Piece.BLACK, Piece.KING, img_bk, e8);
e8.piece = bk;
var bb2 = new Piece(Piece.BLACK, Piece.BISHOP, img_bb2, f8);
f8.piece = bb2;
var bn2 = new Piece(Piece.BLACK, Piece.KNIGHT, img_bn2, g8);
g8.piece = bn2;
var br2 = new Piece(Piece.BLACK, Piece.ROOK, img_br2, h8);
h8.piece = br2;
var whitePieces = new LinkedList();
var blackPieces = new LinkedList();
whitePieces.add(wp1);
whitePieces.add(wp2);
whitePieces.add(wp3);
whitePieces.add(wp4);
whitePieces.add(wp5);
whitePieces.add(wp6);
whitePieces.add(wp7);
whitePieces.add(wp8);
whitePieces.add(wr1);
whitePieces.add(wr2);
whitePieces.add(wn1);
whitePieces.add(wn2);
whitePieces.add(wb1);
whitePieces.add(wb2);
whitePieces.add(wq);
whitePieces.add(wk);
blackPieces.add(bp1);
blackPieces.add(bp2);
blackPieces.add(bp3);
blackPieces.add(bp4);
blackPieces.add(bp5);
blackPieces.add(bp6);
blackPieces.add(bp7);
blackPieces.add(bp8);
blackPieces.add(br1);
blackPieces.add(br2);
blackPieces.add(bn1);
blackPieces.add(bn2);
blackPieces.add(bb1);
blackPieces.add(bb2);
blackPieces.add(bq);
blackPieces.add(bk);
var whiteMoves = new LinkedList(null);
var blackMoves = new LinkedList(null);
listValidMoves(Piece.WHITE);
listValidMoves(Piece.BLACK);
function listValidMoves(color){
if (color == Piece.WHITE){
window.whiteMoves = new LinkedList(null);
pieceNode = whitePieces.head;
while (pieceNode != null){
for (var i = 0; i < 8; i++){
for (var j = 0; j < 8; j++){
oldPiece = squares[i][j].piece;
oldSquare = pieceNode.contents.square;
if (checkValidMove(pieceNode.contents, squares[i][j], false)){
if (window.whiteMoves.head == null){
window.whiteMoves.head = new LLNode(null, {piece: pieceNode.contents, square: squares[i][j]}, null);
window.whiteMoves.tail = window.whiteMoves.head;
window.whiteMoves.length = 1;
}
else
window.whiteMoves.add({piece: pieceNode.contents, square: squares[i][j]});
}
squares[i][j].piece = oldPiece;
pieceNode.contents.square = oldSquare;
pieceNode.contents.square.piece = pieceNode.contents;
}
}
pieceNode = pieceNode.next;
}
}
else if (color == Piece.BLACK){
window.blackMoves = new LinkedList(null);
pieceNode = blackPieces.head;
while (pieceNode != null){
for (var i = 0; i < 8; i++){
for (var j = 0; j < 8; j++){
oldPiece = squares[i][j].piece;
oldSquare = pieceNode.contents.square;
if (checkValidMove(pieceNode.contents, squares[i][j], false)){
if (window.blackMoves.head == null){
window.blackMoves.head = new LLNode(null, {piece: pieceNode.contents, square: squares[i][j]}, null);
window.blackMoves.tail = window.blackMoves.head;
window.blackMoves.length = 1;
}
else
window.blackMoves.add({piece: pieceNode.contents, square: squares[i][j]});
}
squares[i][j].piece = oldPiece;
pieceNode.contents.square = oldSquare;
pieceNode.contents.square.piece = pieceNode.contents;
}
}
pieceNode = pieceNode.next;
}
}
}