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chess002.html
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<body>
<script>
var startingFen = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"
var each = function (o, cb) {
if (o instanceof Array) {
for (var i = 0; i < o.length; i++) {
if (cb(o[i], i, o) == false)
return false
}
} else {
for (var k in o) {
if (o.hasOwnProperty(k)) {
if (cb(o[k], k, o) == false)
return false
}
}
}
return true
}
function getPos(obj) {
var x = y = 0
do {
x += obj.offsetLeft
y += obj.offsetTop
} while (obj = obj.offsetParent)
return {x : x, y : y}
}
function makeDraggable(d, onDrop) {
d.onmousedown = function (e) {
e.preventDefault()
var pos = getPos(d.offsetParent)
var offset = {
x : e.pageX - pos.x,
y : e.pageY - pos.y
}
var oldZ = d.style.zIndex
var oldMove = document.onmousemove
var oldUp = document.onmouseup
d.style.zIndex = 1000000
document.onmousemove = function (e) {
d.style.left = e.pageX - offset.x - pos.x
d.style.top = e.pageY - offset.y - pos.y
}
document.onmouseup = function (e) {
document.onmousemove = oldMove
document.onmouseup = oldUp
d.style.zIndex = oldZ
onDrop(e.pageX, e.pageY)
}
}
d.ontouchstart = function (e) {
e.preventDefault()
var pos = getPos(d.offsetParent)
var last_pageX = e.touches[0].pageX
var last_pageY = e.touches[0].pageY
var offset = {
x : last_pageX - pos.x,
y : last_pageY - pos.y
}
var oldZ = d.style.zIndex
var oldMove = document.ontouchmove
var oldEnd = document.ontouchend
var oldCancel = document.ontouchcancel
d.style.zIndex = 1000000
document.ontouchmove = function (e) {
last_pageX = e.touches[0].pageX
last_pageY = e.touches[0].pageY
d.style.left = last_pageX - offset.x - pos.x
d.style.top = last_pageY - offset.y - pos.y
}
document.ontouchcancel = function (e) {
document.ontouchmove = oldMove
document.ontouchend = oldEnd
document.ontouchcancel = oldCancel
d.style.zIndex = oldZ
}
document.ontouchend = function (e) {
document.ontouchcancel(e)
onDrop(last_pageX, last_pageY)
}
}
}
function drawChessBoard(fen, size, onMove, suggestedMove) {
fen = fen || "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w"
var s = fen.split(/ /)
var whitesMove = s[1] == 'w'
fen = s[0]
fen = fen.replace(/\d/g, function (x) { return new Array(1 * x + 1).join(' ') }).replace(/\//g, '')
size = size || 400
var squareSize = size / 8
var blackSquareColor = 'rgb(0,230,255)' // 'rgb(230,230,255)'
var whiteSquareColor = 'rgb(230,230,255)' // 'rgb(230,255,255)'
var blackPieceColor = 'black'
var whitePieceColorBottom = 'white'
var whitePieceColorTop = 'black'
var d = document.createElement('div')
d.style.position = 'relative'
d.style.width = size
d.style.height = size
function makeSquare() {
var d = document.createElement('div')
d.style.width = squareSize
d.style.height = squareSize
d.style.textAlign = 'center'
d.style.verticalAlign = 'top'
// d.style.fontFamily = '"cases"'
// d.style.fontSize = squareSize * .9
d.style.font = squareSize * .5 + 'px "cases", serif'
d.style.cursor = 'default'
return d
}
for (var yy = 0; yy < 8; yy++) {
var y = whitesMove ? yy : 7 - yy
for (var xx = 0; xx < 8; xx++) {
var x = whitesMove ? xx : 7 - xx
var square = makeSquare()
square.style.float = 'left'
square.style.position = 'relative'
square.style.background = (x + y) % 2 == 0 ? whiteSquareColor : blackSquareColor
// if (suggestedMove && suggestedMove.indexOf(String.fromCharCode('a'.charCodeAt(0) + x) + (8 - y)) >= 0) {
// square.css({ background : 'red' })
// }
var piece = get_fresh_piece(fen[y * 8 + x])
if (piece) {
var pieceDiv = makeSquare()
pieceDiv.style.position = 'relative'
pieceDiv.appendChild(piece)
;(function () {
function getBoardPos(x, y) {
if (x < 0 || x > 7 || y < 0 || y > 7)
return 'offboard'
return String.fromCharCode('a'.charCodeAt(0) + x) + (8 - y)
}
var from = getBoardPos(x, y)
makeDraggable(pieceDiv, function (x, y) {
var pos = getPos(d)
x = Math.floor((x - pos.x) / squareSize)
y = Math.floor((y - pos.y) / squareSize)
if (!whitesMove) {
x = 7 - x
y = 7 - y
}
if (onMove)
onMove(from + getBoardPos(x, y))
})
})();
square.appendChild(pieceDiv)
}
d.appendChild(square)
var loc = document.createElement('div')
loc.style.position = 'absolute'
loc.style.bottom = '0px'
loc.style.left = '0px'
loc.style.color = 'black'
loc.style.fontSize = 'small'
loc.innerHTML = ' ' + String.fromCharCode('a'.charCodeAt(0) + x) + ((7 - y) + 1)
square.appendChild(loc)
}
}
return d
}
function drawChessGame(fen) {
var d = document.createElement('div')
var fens = [fen]
function redrawBoard() {
while (d.firstChild) { d.removeChild(d.firstChild) }
d.appendChild(drawChessBoard(fens.slice(-1)[0], window.innerWidth, function (move) {
var newFen = applyMove(fens.slice(-1)[0], move)
if (newFen) {
fens.push(newFen)
}
redrawBoard()
}))
var b = document.createElement('div')
b.style.background = 'rgb(255, 255, 200)'
b.style.height = window.innerWidth / 4
b.innerHTML = '<'
var f = function () {
if (fens.length > 1)
fens.pop()
redrawBoard()
}
if (b.ontouchstart != undefined)
b.ontouchstart = f
else
b.onmousedown = f
d.appendChild(b)
}
redrawBoard()
return d
}
var piece_pics = {}
function get_fresh_piece(x) {
var old_c = piece_pics[x]
if (!old_c) { return }
var c = document.createElement('canvas')
c.width = old_c.width
c.height = old_c.height
var g = c.getContext('2d')
g.drawImage(old_c, 0, 0)
return c
}
function main() {
var w = window.innerWidth
var h = window.innerHeight
var size = Math.min(w, h)
var peice_size = Math.floor(size / 8)
console.log('stuff:')
console.log(size)
console.log(peice_size)
var pieces = {P: 'wp', R: 'wr', N: 'wn', B: 'wb', K: 'wk', Q: 'wq', p: 'bp', r: 'br', n: 'bn', b: 'bb', k: 'bk', q: 'bq'}
var count = 0
each(pieces, function (p, pp) {
count++
var img = new Image()
img.onload = function () {
var c = document.createElement('canvas')
c.width = peice_size
c.height = peice_size
var g = c.getContext('2d')
g.drawImage(img, 0, 0, peice_size, peice_size)
piece_pics[pp] = c
next235()
}
img.src = 'https://dglittle.github.io/cdn/' + p + '001.png'
})
var done_count = 0
function next235() {
done_count++
if (done_count == count) {
document.body.style.padding = 0
document.body.style.margin = 0
document.body.appendChild(drawChessGame(startingFen))
}
}
}
// adapted from https://raw.github.com/glinscott/Garbochess-JS/master/js/garbochess.js
var myMap = function (o, func) {
if (o instanceof Array) {
var accum = []
for (var i = 0; i < o.length; i++)
accum[i] = func(o[i], i, o)
return accum
} else {
var accum = {}
for (var k in o)
if (o.hasOwnProperty(k))
accum[k] = func(o[k], k, o)
return accum
}
}
var mySort = function (a, func, desc) {
return myMap(myMap(a, function (e, i) {
return {
v : e,
f : func(e, i)
}
}).sort(function (a, b) {
if (a.f < b.f) return desc ? 1 : -1
if (a.f > b.f) return desc ? -1 : 1
return 0
}), function (e) { return e.v })
}
var unPairs = function (a, b) {
var accum = {}
if (b) {
each(a, function (k, i) {
accum[k] = b[i]
})
} else {
each(a, function (e) {
accum[e[0]] = e[1]
})
}
return accum
}
function applyMove(fen, move) {
ResetGame()
InitializeFromFen(fen)
var moves = unPairs(myMap(GenerateValidMoves(), function (m) { return [FormatMove(m), m] }))
move = moves[move] || moves[move + 'q']
if (move) {
MakeMove(move)
return GetFen()
}
}
function suggestMoves(fen, time) {
ResetGame()
InitializeFromFen(fen)
g_timeout = time || 40
return Search(function (bestMove, score) {
console.log("bestMove: " + FormatMove(bestMove))
console.log("score: " + score)
}, 99, function () {})
}
function GetFen(){
var result = "";
for (var row = 0; row < 8; row++) {
if (row != 0)
result += '/';
var empty = 0;
for (var col = 0; col < 8; col++) {
var piece = g_board[((row + 2) << 4) + col + 4];
if (piece == 0) {
empty++;
}
else {
if (empty != 0)
result += empty;
empty = 0;
var pieceChar = [" ", "p", "n", "b", "r", "q", "k", " "][(piece & 0x7)];
result += ((piece & colorWhite) != 0) ? pieceChar.toUpperCase() : pieceChar;
}
}
if (empty != 0) {
result += empty;
}
}
result += g_toMove == colorWhite ? " w" : " b";
result += " ";
if (g_castleRights == 0) {
result += "-";
}
else {
if ((g_castleRights & 1) != 0)
result += "K";
if ((g_castleRights & 2) != 0)
result += "Q";
if ((g_castleRights & 4) != 0)
result += "k";
if ((g_castleRights & 8) != 0)
result += "q";
}
result += " ";
if (g_enPassentSquare == -1) {
result += '-';
}
else {
result += FormatSquare(g_enPassentSquare);
}
return result;
}
function GetMoveSAN(move, validMoves) {
var from = move & 0xFF;
var to = (move >> 8) & 0xFF;
if (move & moveflagCastleKing) return "O-O";
if (move & moveflagCastleQueen) return "O-O-O";
var pieceType = g_board[from] & 0x7;
var result = ["", "", "N", "B", "R", "Q", "K", ""][pieceType];
var dupe = false, rowDiff = true, colDiff = true;
if (validMoves == null) {
validMoves = GenerateValidMoves();
}
for (var i = 0; i < validMoves.length; i++) {
var moveFrom = validMoves[i] & 0xFF;
var moveTo = (validMoves[i] >> 8) & 0xFF;
if (moveFrom != from &&
moveTo == to &&
(g_board[moveFrom] & 0x7) == pieceType) {
dupe = true;
if ((moveFrom & 0xF0) == (from & 0xF0)) {
rowDiff = false;
}
if ((moveFrom & 0x0F) == (from & 0x0F)) {
colDiff = false;
}
}
}
if (dupe) {
if (colDiff) {
result += FormatSquare(from).charAt(0);
} else if (rowDiff) {
result += FormatSquare(from).charAt(1);
} else {
result += FormatSquare(from);
}
} else if (pieceType == piecePawn && (g_board[to] != 0 || (move & moveflagEPC))) {
result += FormatSquare(from).charAt(0);
}
if (g_board[to] != 0 || (move & moveflagEPC)) {
result += "x";
}
result += FormatSquare(to);
if (move & moveflagPromotion) {
if (move & moveflagPromoteBishop) result += "=B";
else if (move & moveflagPromoteKnight) result += "=N";
else if (move & moveflagPromoteQueen) result += "=Q";
else result += "=R";
}
MakeMove(move);
if (g_inCheck) {
result += GenerateValidMoves().length == 0 ? "#" : "+";
}
UnmakeMove(move);
return result;
}
function FormatSquare(square) {
var letters = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h'];
return letters[(square & 0xF) - 4] + ((9 - (square >> 4)) + 1);
}
function FormatMove(move) {
var result = FormatSquare(move & 0xFF) + FormatSquare((move >> 8) & 0xFF);
if (move & moveflagPromotion) {
if (move & moveflagPromoteBishop) result += "b";
else if (move & moveflagPromoteKnight) result += "n";
else if (move & moveflagPromoteQueen) result += "q";
else result += "r";
}
return result;
}
function GetMoveFromString(moveString) {
var moves = GenerateValidMoves();
for (var i = 0; i < moves.length; i++) {
if (FormatMove(moves[i]) == moveString) {
return moves[i];
}
}
alert("busted! ->" + moveString + " fen:" + GetFen());
}
function PVFromHash(move, ply) {
if (ply == 0)
return "";
if (move == 0) {
if (g_inCheck) return "checkmate";
return "stalemate";
}
var pvString = " " + GetMoveSAN(move);
MakeMove(move);
var hashNode = g_hashTable[g_hashKeyLow & g_hashMask];
if (hashNode != null && hashNode.lock == g_hashKeyHigh && hashNode.bestMove != null) {
pvString += PVFromHash(hashNode.bestMove, ply - 1);
}
UnmakeMove(move);
return pvString;
}
//
// Searching code
//
var g_startTime;
var g_nodeCount;
var g_qNodeCount;
var g_searchValid;
var g_globalPly = 0;
function Search(finishMoveCallback, maxPly, finishPlyCallback) {
var lastEval;
var alpha = minEval;
var beta = maxEval;
g_globalPly++;
g_nodeCount = 0;
g_qNodeCount = 0;
g_searchValid = true;
var bestMove = 0;
var value;
g_startTime = (new Date()).getTime();
var i;
var moveScores
for (i = 1; i <= maxPly && g_searchValid; i++) {
var newMoveScores = []
var tmp = AlphaBeta(i, 0, alpha, beta, newMoveScores);
if (!g_searchValid) break;
moveScores = newMoveScores
value = tmp;
if (value > alpha && value < beta) {
alpha = value - 500;
beta = value + 500;
if (alpha < minEval) alpha = minEval;
if (beta > maxEval) beta = maxEval;
} else if (alpha != minEval) {
alpha = minEval;
beta = maxEval;
i--;
}
if (g_hashTable[g_hashKeyLow & g_hashMask] != null) {
bestMove = g_hashTable[g_hashKeyLow & g_hashMask].bestMove;
}
if (finishPlyCallback != null) {
finishPlyCallback(bestMove, value, (new Date()).getTime() - g_startTime, i);
}
}
if (finishMoveCallback != null) {
finishMoveCallback(bestMove, value, (new Date()).getTime() - g_startTime, i - 1);
}
return mySort(moveScores, function (e) { return -e.score })
}
var minEval = -2000000;
var maxEval = +2000000;
var minMateBuffer = minEval + 2000;
var maxMateBuffer = maxEval - 2000;
var materialTable = [0, 800, 3350, 3450, 5000, 9750, 600000];
var pawnAdj =
[
0, 0, 0, 0, 0, 0, 0, 0,
-25, 105, 135, 270, 270, 135, 105, -25,
-80, 0, 30, 176, 176, 30, 0, -80,
-85, -5, 25, 175, 175, 25, -5, -85,
-90, -10, 20, 125, 125, 20, -10, -90,
-95, -15, 15, 75, 75, 15, -15, -95,
-100, -20, 10, 70, 70, 10, -20, -100,
0, 0, 0, 0, 0, 0, 0, 0
];
var knightAdj =
[-200, -100, -50, -50, -50, -50, -100, -200,
-100, 0, 0, 0, 0, 0, 0, -100,
-50, 0, 60, 60, 60, 60, 0, -50,
-50, 0, 30, 60, 60, 30, 0, -50,
-50, 0, 30, 60, 60, 30, 0, -50,
-50, 0, 30, 30, 30, 30, 0, -50,
-100, 0, 0, 0, 0, 0, 0, -100,
-200, -50, -25, -25, -25, -25, -50, -200
];
var bishopAdj =
[ -50,-50,-25,-10,-10,-25,-50,-50,
-50,-25,-10, 0, 0,-10,-25,-50,
-25,-10, 0, 25, 25, 0,-10,-25,
-10, 0, 25, 40, 40, 25, 0,-10,
-10, 0, 25, 40, 40, 25, 0,-10,
-25,-10, 0, 25, 25, 0,-10,-25,
-50,-25,-10, 0, 0,-10,-25,-50,
-50,-50,-25,-10,-10,-25,-50,-50
];
var rookAdj =
[ -60, -30, -10, 20, 20, -10, -30, -60,
40, 70, 90,120,120, 90, 70, 40,
-60, -30, -10, 20, 20, -10, -30, -60,
-60, -30, -10, 20, 20, -10, -30, -60,
-60, -30, -10, 20, 20, -10, -30, -60,
-60, -30, -10, 20, 20, -10, -30, -60,
-60, -30, -10, 20, 20, -10, -30, -60,
-60, -30, -10, 20, 20, -10, -30, -60
];
var kingAdj =
[ 50, 150, -25, -125, -125, -25, 150, 50,
50, 150, -25, -125, -125, -25, 150, 50,
50, 150, -25, -125, -125, -25, 150, 50,
50, 150, -25, -125, -125, -25, 150, 50,
50, 150, -25, -125, -125, -25, 150, 50,
50, 150, -25, -125, -125, -25, 150, 50,
50, 150, -25, -125, -125, -25, 150, 50,
150, 250, 75, -25, -25, 75, 250, 150
];
var emptyAdj =
[0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
];
var pieceSquareAdj = new Array(8);
// Returns the square flipped
var flipTable = new Array(256);
function PawnEval(color) {
var pieceIdx = (color | 1) << 4;
var from = g_pieceList[pieceIdx++];
while (from != 0) {
from = g_pieceList[pieceIdx++];
}
}
function Mobility(color) {
var result = 0;
var from, to, mob, pieceIdx;
var enemy = color == 8 ? 0x10 : 0x8
var mobUnit = color == 8 ? g_mobUnit[0] : g_mobUnit[1];
// Knight mobility
mob = -3;
pieceIdx = (color | 2) << 4;
from = g_pieceList[pieceIdx++];
while (from != 0) {
mob += mobUnit[g_board[from + 31]];
mob += mobUnit[g_board[from + 33]];
mob += mobUnit[g_board[from + 14]];
mob += mobUnit[g_board[from - 14]];
mob += mobUnit[g_board[from - 31]];
mob += mobUnit[g_board[from - 33]];
mob += mobUnit[g_board[from + 18]];
mob += mobUnit[g_board[from - 18]];
from = g_pieceList[pieceIdx++];
}
result += 65 * mob;
// Bishop mobility
mob = -4;
pieceIdx = (color | 3) << 4;
from = g_pieceList[pieceIdx++];
while (from != 0) {
to = from - 15; while (g_board[to] == 0) { to -= 15; mob++; }
if (g_board[to] & enemy) {
mob++;
if (!(g_board[to] & piecePawn)) {
to -= 15; while (g_board[to] == 0) to -= 15;
mob += mobUnit[g_board[to]] << 2;
}
}
to = from - 17; while (g_board[to] == 0) { to -= 17; mob++; }
if (g_board[to] & enemy) {
mob++;
if (!(g_board[to] & piecePawn)) {
to -= 17; while (g_board[to] == 0) to -= 17;
mob += mobUnit[g_board[to]] << 2;
}
}
to = from + 15; while (g_board[to] == 0) { to += 15; mob++; }
if (g_board[to] & enemy) {
mob++;
if (!(g_board[to] & piecePawn)) {
to += 15; while (g_board[to] == 0) to += 15;
mob += mobUnit[g_board[to]] << 2;
}
}
to = from + 17; while (g_board[to] == 0) { to += 17; mob++; }
if (g_board[to] & enemy) {
mob++;
if (!(g_board[to] & piecePawn)) {
to += 17; while (g_board[to] == 0) to += 17;
mob += mobUnit[g_board[to]] << 2;
}
}
from = g_pieceList[pieceIdx++];
}
result += 44 * mob;
// Rook mobility
mob = -4;
pieceIdx = (color | 4) << 4;
from = g_pieceList[pieceIdx++];
while (from != 0) {
to = from - 1; while (g_board[to] == 0) { to--; mob++;} if (g_board[to] & enemy) mob++;
to = from + 1; while (g_board[to] == 0) { to++; mob++; } if (g_board[to] & enemy) mob++;
to = from + 16; while (g_board[to] == 0) { to += 16; mob++; } if (g_board[to] & enemy) mob++;
to = from - 16; while (g_board[to] == 0) { to -= 16; mob++; } if (g_board[to] & enemy) mob++;
from = g_pieceList[pieceIdx++];
}
result += 25 * mob;
// Queen mobility
mob = -2;
pieceIdx = (color | 5) << 4;
from = g_pieceList[pieceIdx++];
while (from != 0) {
to = from - 15; while (g_board[to] == 0) { to -= 15; mob++; } if (g_board[to] & enemy) mob++;
to = from - 17; while (g_board[to] == 0) { to -= 17; mob++; } if (g_board[to] & enemy) mob++;
to = from + 15; while (g_board[to] == 0) { to += 15; mob++; } if (g_board[to] & enemy) mob++;
to = from + 17; while (g_board[to] == 0) { to += 17; mob++; } if (g_board[to] & enemy) mob++;
to = from - 1; while (g_board[to] == 0) { to--; mob++; } if (g_board[to] & enemy) mob++;
to = from + 1; while (g_board[to] == 0) { to++; mob++; } if (g_board[to] & enemy) mob++;
to = from + 16; while (g_board[to] == 0) { to += 16; mob++; } if (g_board[to] & enemy) mob++;
to = from - 16; while (g_board[to] == 0) { to -= 16; mob++; } if (g_board[to] & enemy) mob++;
from = g_pieceList[pieceIdx++];
}
result += 22 * mob;
return result;
}
function Evaluate() {
var curEval = g_baseEval;
var evalAdjust = 0;
// Black queen gone, then cancel white's penalty for king movement
if (g_pieceList[pieceQueen << 4] == 0)
evalAdjust -= pieceSquareAdj[pieceKing][g_pieceList[(colorWhite | pieceKing) << 4]];
// White queen gone, then cancel black's penalty for king movement
if (g_pieceList[(colorWhite | pieceQueen) << 4] == 0)
evalAdjust += pieceSquareAdj[pieceKing][flipTable[g_pieceList[pieceKing << 4]]];
// Black bishop pair
if (g_pieceCount[pieceBishop] >= 2)
evalAdjust -= 500;
// White bishop pair
if (g_pieceCount[pieceBishop | colorWhite] >= 2)
evalAdjust += 500;
var mobility = Mobility(8) - Mobility(0);
if (g_toMove == 0) {
// Black
curEval -= mobility;
curEval -= evalAdjust;
}
else {
curEval += mobility;
curEval += evalAdjust;
}
return curEval;
}
function ScoreMove(move){
var moveTo = (move >> 8) & 0xFF;
var captured = g_board[moveTo] & 0x7;
var piece = g_board[move & 0xFF];
var score;
if (captured != 0) {
var pieceType = piece & 0x7;
score = (captured << 5) - pieceType;
} else {
score = historyTable[piece & 0xF][moveTo];
}
return score;
}
function QSearch(alpha, beta, ply) {
g_qNodeCount++;
var realEval = g_inCheck ? (minEval + 1) : Evaluate();
if (realEval >= beta)
return realEval;
if (realEval > alpha)
alpha = realEval;
var moves = new Array();
var moveScores = new Array();
var wasInCheck = g_inCheck;
if (wasInCheck) {
// TODO: Fast check escape generator and fast checking moves generator
GenerateCaptureMoves(moves, null);
GenerateAllMoves(moves);
for (var i = 0; i < moves.length; i++) {
moveScores[i] = ScoreMove(moves[i]);
}
} else {
GenerateCaptureMoves(moves, null);
for (var i = 0; i < moves.length; i++) {
var captured = g_board[(moves[i] >> 8) & 0xFF] & 0x7;
var pieceType = g_board[moves[i] & 0xFF] & 0x7;
moveScores[i] = (captured << 5) - pieceType;
}
}
for (var i = 0; i < moves.length; i++) {
var bestMove = i;
for (var j = moves.length - 1; j > i; j--) {
if (moveScores[j] > moveScores[bestMove]) {
bestMove = j;
}
}
{
var tmpMove = moves[i];
moves[i] = moves[bestMove];
moves[bestMove] = tmpMove;
var tmpScore = moveScores[i];
moveScores[i] = moveScores[bestMove];
moveScores[bestMove] = tmpScore;
}
if (!wasInCheck && !See(moves[i])) {
continue;
}
if (!MakeMove(moves[i])) {
continue;
}
var value = -QSearch(-beta, -alpha, ply - 1);
UnmakeMove(moves[i]);
if (value > realEval) {
if (value >= beta)
return value;
if (value > alpha)
alpha = value;
realEval = value;
}
}
/* Disable checks... Too slow currently
if (ply == 0 && !wasInCheck) {
moves = new Array();
GenerateAllMoves(moves);
for (var i = 0; i < moves.length; i++) {
moveScores[i] = ScoreMove(moves[i]);
}
for (var i = 0; i < moves.length; i++) {
var bestMove = i;
for (var j = moves.length - 1; j > i; j--) {
if (moveScores[j] > moveScores[bestMove]) {
bestMove = j;
}
}
{
var tmpMove = moves[i];
moves[i] = moves[bestMove];
moves[bestMove] = tmpMove;
var tmpScore = moveScores[i];
moveScores[i] = moveScores[bestMove];
moveScores[bestMove] = tmpScore;
}
if (!MakeMove(moves[i])) {
continue;
}
var checking = g_inCheck;
UnmakeMove(moves[i]);
if (!checking) {
continue;
}
if (!See(moves[i])) {
continue;
}
MakeMove(moves[i]);
var value = -QSearch(-beta, -alpha, ply - 1);
UnmakeMove(moves[i]);
if (value > realEval) {
if (value >= beta)
return value;
if (value > alpha)
alpha = value;
realEval = value;
}
}
}
*/
return realEval;
}
function StoreHash(value, flags, ply, move, depth) {
if (value >= maxMateBuffer)
value += depth;
else if (value <= minMateBuffer)
value -= depth;
g_hashTable[g_hashKeyLow & g_hashMask] = new HashEntry(g_hashKeyHigh, value, flags, ply, move);
}
function IsHashMoveValid(hashMove) {
var from = hashMove & 0xFF;
var to = (hashMove >> 8) & 0xFF;
var ourPiece = g_board[from];
var pieceType = ourPiece & 0x7;
if (pieceType < piecePawn || pieceType > pieceKing) return false;
// Can't move a piece we don't control
if (g_toMove != (ourPiece & 0x8))
return false;
// Can't move to a square that has something of the same color
if (g_board[to] != 0 && (g_toMove == (g_board[to] & 0x8)))
return false;
if (pieceType == piecePawn) {
if (hashMove & moveflagEPC) {
return false;
}
// Valid moves are push, capture, double push, promotions
var dir = to - from;
if ((g_toMove == colorWhite) != (dir < 0)) {
// Pawns have to move in the right direction
return false;
}
var row = to & 0xF0;
if (((row == 0x90 && !g_toMove) ||
(row == 0x20 && g_toMove)) != (hashMove & moveflagPromotion)) {
// Handle promotions
return false;
}
if (dir == -16 || dir == 16) {
// White/Black push
return g_board[to] == 0;
} else if (dir == -15 || dir == -17 || dir == 15 || dir == 17) {
// White/Black capture
return g_board[to] != 0;
} else if (dir == -32) {
// Double white push
if (row != 0x60) return false;
if (g_board[to] != 0) return false;
if (g_board[from - 16] != 0) return false;
} else if (dir == 32) {
// Double black push
if (row != 0x50) return false;
if (g_board[to] != 0) return false;
if (g_board[from + 16] != 0) return false;
} else {
return false;
}
return true;
} else {
// This validates that this piece type can actually make the attack
if (hashMove >> 16) return false;
return IsSquareAttackableFrom(to, from);
}
}
function IsRepDraw() {
var stop = g_moveCount - 1 - g_move50;
stop = stop < 0 ? 0 : stop;
for (var i = g_moveCount - 5; i >= stop; i -= 2) {
if (g_repMoveStack[i] == g_hashKeyLow)
return true;