// Cloned by Mathias Bazin on 1 Aug 2018 from World "Chess : Mind vs Random" by Mathias Bazin
// Please leave this clone trail here.
AB.runReady = false;
AB.clockTick = 60;
let s = document.createElement("script");
s.src = "https://cdnjs.cloudflare.com/ajax/libs/chess.js/0.10.2/chess.js";
s.onload = function() {
console.log("chess loaded");
AB.runReady = true;
}; // function to be called when JS is loaded
document.head.appendChild(s);
function World()
{
let chess;
let scl = 40;
let xoff = 100;
let yoff = $(document).height()/2;
let turn = 0;
let ctx;
let self = this;
let bk, bq, bn, br, bb, bp, wk, wq, wn, wr, wb, wp, board;
function drawBoard(board)
{
let square = 0;
for(let cur of board)
{
switch(cur)
{
case "r":
ctx.drawImage(br, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "n":
ctx.drawImage(bn, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "b":
ctx.drawImage(bb, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "q":
ctx.drawImage(bq, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "k":
ctx.drawImage(bk, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "p":
ctx.drawImage(bp, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "R":
ctx.drawImage(wr, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "N":
ctx.drawImage(wn, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "B":
ctx.drawImage(wb, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "Q":
ctx.drawImage(wq, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "K":
ctx.drawImage(wk, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "P":
ctx.drawImage(wp, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
// text(cur, xoff + scl*(square%8), yoff + scl*(Math.floor(square/8)));
square++;
break;
case "/":
break;
case " ":
return;
case "1":
case "2":
case "3":
case "4":
case "5":
case "6":
case "7":
case "8":
square += +cur;
break;
default:
console.log("Error in drawBoard");
}
}
}
function drawGrid()
{
ctx.drawImage(board,xoff,yoff);
}
this.newRun = function()
{
threeworld.init ( "white" );
ctx = threeworld.getContext ( "2d" );
chess = new Chess();
bk = new Image();
bk.src = '/uploads/mathias/bk.png';
bq = new Image();
bq.src = '/uploads/mathias/bq.png';
bn = new Image();
bn.src = '/uploads/mathias/bn.png';
br = new Image();
br.src = '/uploads/mathias/br.png';
bb = new Image();
bb.src = '/uploads/mathias/bb.png';
bp = new Image();
bp.src = '/uploads/mathias/bp.png';
wk = new Image();
wk.src = '/uploads/mathias/wk.png';
wq = new Image();
wq.src = '/uploads/mathias/wq.png';
wn = new Image();
wn.src = '/uploads/mathias/wn.png';
wr = new Image();
wr.src = '/uploads/mathias/wr.png';
wb = new Image();
wb.src = '/uploads/mathias/wb.png';
wp = new Image();
wp.src = '/uploads/mathias/wp.png';
board = new Image();
board.src = '/uploads/mathias/board.png'
drawBoard(chess.fen());
};
this.takeAction = function ( action )
{
if (!chess.game_over())
{
turn++;
if(chess.turn() == 'w')
{
$("#user_span1").html("<p>Turn " + turn + "</p> <p>White has to make a move</p>");
chess.move(action);
}
else //Black player makes his move
{
$("#user_span1").html("<p>Turn " + turn + "</p> <p>Black has to make a move</p>");
let move = minimaxRoot(1, chess, true);
chess.move(move);
}
drawGrid();
drawBoard(chess.fen());
console.log(chess.ascii());
}
else
{
ABRun.abortRun = true;
}
};
this.getState = function()
{
return chess.fen();
};
this.getScore = function()
{
let score = 200; //base score
let fen = chess.fen();
let i = 0;
//points for the pieces
while (fen[i] != " ")
{
switch(fen[i])
{
case 'r':
score -= 5;
break;
case 'n':
case 'b':
score -= 3;
break;
case 'p':
score -= 1;
break;
case 'q':
score -= 9;
break;
case 'R':
score += 5;
break;
case 'N':
case 'B':
score += 3;
break;
case 'P':
score += 1;
break;
case 'Q':
score += 9;
break;
}
i++;
}
console.log("pieces points : ", score);
//points for the win/lose and time
if(chess.in_checkmate())
{
let timePoints = 100 - turn;
if (timePoints < 0) timePoints = 0;
console.log("time points", timePoints);
if (chess.turn() == 'b')
{
console.log("win ponts : ", 100);
score += 100;
score += timePoints;
}
else
{
console.log("lose ponts : ", -100);
score -= 100;
score -= timePoints;
}
}
return score;
}
this.endRun = function()
{
let s = "Game Over";
if (chess.in_draw())
{
s += " : Draw";
if (chess.insufficient_material()) s += " (insufficient material)";
if (chess.in_stalemate()) s += " (stalemate)";
// if (chess.in_threefold_repetition()()) s += " (threefold repetition)";
}
else if(chess.in_checkmate())
{
if (chess.turn() == 'b') s+= " : White wins (Black has been ckeckmated)";
else s+= " : Black wins (White has been ckeckmated)";
}
console.log(s);
$("#user_span2").html("<p>" + s + "</p>");
ctx.font = "20px Arial";
ctx.fillText(s,xoff,yoff - 20);
$("#user_span2").html("<p>Score : " + self.getScore() + "</p>");
}
/*=========================The "AI" part starts here *====================*/
let positionCount;
let minimaxRoot =function(depth, game, isMaximisingPlayer) {
let newGameMoves = game.moves();
let bestMove = -9999;
let bestMoveFound;
for(let i = 0; i < newGameMoves.length; i++) {
let newGameMove = newGameMoves[i]
game.move(newGameMove);
let value = minimax(depth - 1, game, -10000, 10000, !isMaximisingPlayer);
game.undo();
if(value >= bestMove) {
bestMove = value;
bestMoveFound = newGameMove;
}
}
return bestMoveFound;
};
let minimax = function (depth, game, alpha, beta, isMaximisingPlayer) {
positionCount++;
if (depth === 0) {
return -evaluateBoard(toBoard(game));
}
let newGameMoves = game.moves();
if (isMaximisingPlayer) {
let bestMove = -9999;
for (let i = 0; i < newGameMoves.length; i++) {
game.move(newGameMoves[i]);
bestMove = Math.max(bestMove, minimax(depth - 1, game, alpha, beta, !isMaximisingPlayer));
game.undo();
alpha = Math.max(alpha, bestMove);
if (beta <= alpha) {
return bestMove;
}
}
return bestMove;
} else {
let bestMove = 9999;
for (let i = 0; i < newGameMoves.length; i++) {
game.move(newGameMoves[i]);
bestMove = Math.min(bestMove, minimax(depth - 1, game, alpha, beta, !isMaximisingPlayer));
game.undo();
beta = Math.min(beta, bestMove);
if (beta <= alpha) {
return bestMove;
}
}
return bestMove;
}
};
let evaluateBoard = function (board) {
let totalEvaluation = 0;
for (let i = 0; i < 8; i++) {
for (let j = 0; j < 8; j++) {
totalEvaluation = totalEvaluation + getPieceValue(board[i][j], i ,j);
}
}
return totalEvaluation;
};
let reverseArray = function(array) {
return array.slice().reverse();
};
let pawnEvalWhite =
[
[0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
[5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0],
[1.0, 1.0, 2.0, 3.0, 3.0, 2.0, 1.0, 1.0],
[0.5, 0.5, 1.0, 2.5, 2.5, 1.0, 0.5, 0.5],
[0.0, 0.0, 0.0, 2.0, 2.0, 0.0, 0.0, 0.0],
[0.5, -0.5, -1.0, 0.0, 0.0, -1.0, -0.5, 0.5],
[0.5, 1.0, 1.0, -2.0, -2.0, 1.0, 1.0, 0.5],
[0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
];
let pawnEvalBlack = reverseArray(pawnEvalWhite);
let knightEval =
[
[-5.0, -4.0, -3.0, -3.0, -3.0, -3.0, -4.0, -5.0],
[-4.0, -2.0, 0.0, 0.0, 0.0, 0.0, -2.0, -4.0],
[-3.0, 0.0, 1.0, 1.5, 1.5, 1.0, 0.0, -3.0],
[-3.0, 0.5, 1.5, 2.0, 2.0, 1.5, 0.5, -3.0],
[-3.0, 0.0, 1.5, 2.0, 2.0, 1.5, 0.0, -3.0],
[-3.0, 0.5, 1.0, 1.5, 1.5, 1.0, 0.5, -3.0],
[-4.0, -2.0, 0.0, 0.5, 0.5, 0.0, -2.0, -4.0],
[-5.0, -4.0, -3.0, -3.0, -3.0, -3.0, -4.0, -5.0]
];
let bishopEvalWhite = [
[ -2.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -2.0],
[ -1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -1.0],
[ -1.0, 0.0, 0.5, 1.0, 1.0, 0.5, 0.0, -1.0],
[ -1.0, 0.5, 0.5, 1.0, 1.0, 0.5, 0.5, -1.0],
[ -1.0, 0.0, 1.0, 1.0, 1.0, 1.0, 0.0, -1.0],
[ -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0],
[ -1.0, 0.5, 0.0, 0.0, 0.0, 0.0, 0.5, -1.0],
[ -2.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -2.0]
];
let bishopEvalBlack = reverseArray(bishopEvalWhite);
let rookEvalWhite = [
[ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
[ 0.5, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 0.5],
[ -0.5, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -0.5],
[ -0.5, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -0.5],
[ -0.5, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -0.5],
[ -0.5, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -0.5],
[ -0.5, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -0.5],
[ 0.0, 0.0, 0.0, 0.5, 0.5, 0.0, 0.0, 0.0]
];
let rookEvalBlack = reverseArray(rookEvalWhite);
let evalQueen = [
[ -2.0, -1.0, -1.0, -0.5, -0.5, -1.0, -1.0, -2.0],
[ -1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, -1.0],
[ -1.0, 0.0, 0.5, 0.5, 0.5, 0.5, 0.0, -1.0],
[ -0.5, 0.0, 0.5, 0.5, 0.5, 0.5, 0.0, -0.5],
[ 0.0, 0.0, 0.5, 0.5, 0.5, 0.5, 0.0, -0.5],
[ -1.0, 0.5, 0.5, 0.5, 0.5, 0.5, 0.0, -1.0],
[ -1.0, 0.0, 0.5, 0.0, 0.0, 0.0, 0.0, -1.0],
[ -2.0, -1.0, -1.0, -0.5, -0.5, -1.0, -1.0, -2.0]
];
let kingEvalWhite = [
[ -3.0, -4.0, -4.0, -5.0, -5.0, -4.0, -4.0, -3.0],
[ -3.0, -4.0, -4.0, -5.0, -5.0, -4.0, -4.0, -3.0],
[ -3.0, -4.0, -4.0, -5.0, -5.0, -4.0, -4.0, -3.0],
[ -3.0, -4.0, -4.0, -5.0, -5.0, -4.0, -4.0, -3.0],
[ -2.0, -3.0, -3.0, -4.0, -4.0, -3.0, -3.0, -2.0],
[ -1.0, -2.0, -2.0, -2.0, -2.0, -2.0, -2.0, -1.0],
[ 2.0, 2.0, 0.0, 0.0, 0.0, 0.0, 2.0, 2.0 ],
[ 2.0, 3.0, 1.0, 0.0, 0.0, 1.0, 3.0, 2.0 ]
];
let kingEvalBlack = reverseArray(kingEvalWhite);
let getPieceValue = function (piece, x, y) {
if (piece === null) {
return 0;
}
let getAbsoluteValue = function (piece, isWhite, x ,y) {
if (piece.type === 'p') {
return 10 + ( isWhite ? pawnEvalWhite[y][x] : pawnEvalBlack[y][x] );
} else if (piece.type === 'r') {
return 50 + ( isWhite ? rookEvalWhite[y][x] : rookEvalBlack[y][x] );
} else if (piece.type === 'n') {
return 30 + knightEval[y][x];
} else if (piece.type === 'b') {
return 30 + ( isWhite ? bishopEvalWhite[y][x] : bishopEvalBlack[y][x] );
} else if (piece.type === 'q') {
return 90 + evalQueen[y][x];
} else if (piece.type === 'k') {
return 900 + ( isWhite ? kingEvalWhite[y][x] : kingEvalBlack[y][x] );
}
throw "Unknown piece type: " + piece.type;
};
let absoluteValue = getAbsoluteValue(piece, piece.color === 'w', x ,y);
return piece.color === 'w' ? absoluteValue : -absoluteValue;
};
function toBoard(game)
{
let letters = ['a','b','c','d','e','f','g','h'];
let nbs = ['8','7','6','5','4','3','2','1'];
let b = new Array(8);
for (let i =0; i<8; i++)
{
b[i] = new Array(8);
for (let j = 0; j <8; j++)
{
let square = letters[j] + nbs[i];
b[i][j] = game.get(square);
}
}
return b;
}
function boardToString(b)
{
let s = "";
for (let i = 0; i<8; i++)
{
for (let j = 0; j<8; j++)
{
if (b[i][j] === null) s += " ";
else
{
if (b[i][j].color == 'b') s += b[i][j].type;
else s += b[i][j].type.toUpperCase();
}
}
s += "\n";
}
return s;
}
}