15 function escape_html(string) {
16 return String(string).replace(/[&<>"']/g, function (s) {
21 var get_game = function() {
22 var game = new Chess();
23 for (var i = 0; i < move_override; ++i) {
24 game.move(history[i]);
29 var update = function() {
30 var game = get_game();
31 board.position(game.fen());
35 var fetch_analysis = function() {
36 var game = get_game();
38 url: "/opening-stats.pl?fen=" + encodeURIComponent(game.fen())
39 }).done(function(data, textstatus, xhr) {
40 show_lines(data, game);
44 var add_td = function(tr, value) {
45 var td = document.createElement("td");
47 $(td).addClass("num");
57 [ "Move", TYPE_MOVE ],
58 [ "Games", TYPE_INTEGER ],
60 [ "Win%", TYPE_RATIO ],
61 [ "WWin", TYPE_INTEGER ],
62 [ "%WW", TYPE_RATIO ],
63 [ "Bwin", TYPE_INTEGER ],
64 [ "%BW", TYPE_RATIO ],
65 [ "Draw", TYPE_INTEGER ],
66 [ "Draw%", TYPE_RATIO ],
67 [ "AvWElo", TYPE_FLOAT ],
68 [ "AvBElo", TYPE_FLOAT ],
69 [ "EloVar", TYPE_FLOAT ],
70 [ "AWin%", TYPE_RATIO ],
75 var show_lines = function(data, game) {
76 var moves = data['moves'];
77 $('#numviewers').text(data['opening']);
79 if (data['root_game']) {
80 var text = escape_html(data['root_game']['white']);
81 if (data['root_game']['white_elo']) {
82 text += " (" + escape_html(data['root_game']['white_elo']) + ")";
84 text += " – " + escape_html(data['root_game']['black']);
85 if (data['root_game']['black_elo']) {
86 text += " (" + escape_html(data['root_game']['black_elo']) + ")";
88 text += " " + escape_html(data['root_game']['result']).replace(/-/, "–") + "<br />";
89 if (data['root_game']['eco']) {
90 text += "[" + escape_html(data['root_game']['eco']) + "] ";
92 text += "(" + data['root_game']['moves'] + ") ";
93 text += escape_html(data['root_game']['event']) + " " + escape_html(data['root_game']['date']);
94 $('#gamesummary').html(text);
98 for (var i = 0; i < moves.length; ++i) {
101 total_num += parseInt(move['white']);
102 total_num += parseInt(move['draw']);
103 total_num += parseInt(move['black']);
107 var headings_tr = $("#headings");
109 for (var i = 0; i < headings.length; ++i) {
110 var th = document.createElement("th");
111 headings_tr.append(th);
112 $(th).text(headings[i][0]);
113 (function(new_sort_by) {
114 $(th).click(function() {
115 if (sort_by == new_sort_by) {
116 direction = -direction;
118 sort_by = new_sort_by;
121 show_lines(data, game);
127 for (var i = 0; i < moves.length; ++i) {
131 var white = parseInt(move['white']);
132 var draw = parseInt(move['draw']);
133 var black = parseInt(move['black']);
135 line.push(move['move']); // Move.
136 var num = white + draw + black;
137 line.push(num); // N.
138 line.push(num / total_num); // %.
141 var white_win_ratio = (white + 0.5 * draw) / num;
142 var win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
143 line.push(win_ratio);
145 line.push(white); // WWin.
146 line.push(white / num); // %WW.
147 line.push(black); // BWin.
148 line.push(black / num); // %BW.
149 line.push(draw); // Draw.
150 line.push(draw / num); // %Draw.
152 if (move['num_elo'] >= 10) {
154 line.push(move['white_avg_elo']);
155 line.push(move['black_avg_elo']);
156 line.push(move['white_avg_elo'] - move['black_avg_elo']);
158 // Win% corrected for Elo.
159 var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
160 win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
161 white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
162 win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
163 line.push(win_ratio);
173 lines.sort(function(a, b) { return direction * ( b[sort_by] - a[sort_by]); });
175 var tbl = $("#lines");
178 for (var i = 0; i < moves.length; ++i) {
180 var tr = document.createElement("tr");
182 if (line[0] === undefined) {
183 $(tr).addClass("totals");
186 for (var j = 0; j < line.length; ++j) {
187 if (line[j] === null) {
189 } else if (headings[j][1] == TYPE_MOVE) {
190 var td = document.createElement("td");
192 $(td).addClass("move");
193 if (line[j] !== undefined) {
194 if (move_override % 2 == 0) {
195 $(td).text(((move_override / 2) + 1) + ". ");
197 $(td).text(((move_override / 2) + 0.5) + ". …");
201 var move_a = document.createElement("a");
202 move_a.href = "javascript:make_move('" + line[j] + "')";
203 td.appendChild(move_a);
204 $(move_a).text(line[j]);
205 } else if (headings[j][1] == TYPE_INTEGER) {
207 } else if (headings[j][1] == TYPE_FLOAT) {
208 add_td(tr, line[j].toFixed(1));
210 add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
218 var make_move = function(move) {
219 if (move_override < history.length && history[move_override] == move) {
220 // User effectively only moved forward in history.
224 move_override = history.length;
228 window['make_move'] = make_move;
230 var prev_move = function() {
231 if (move_override > 0) {
236 window['prev_move'] = prev_move;
238 var next_move = function() {
239 if (move_override < history.length) {
244 window['next_move'] = next_move;
246 // almost all of this stuff comes from the chessboard.js example page
247 var onDragStart = function(source, piece, position, orientation) {
248 var game = get_game();
249 if (game.game_over() === true ||
250 (game.turn() === 'w' && piece.search(/^b/) !== -1) ||
251 (game.turn() === 'b' && piece.search(/^w/) !== -1)) {
256 var onDrop = function(source, target) {
257 // see if the move is legal
258 var game = get_game();
259 var move = game.move({
262 promotion: 'q' // NOTE: always promote to a queen for example simplicity
266 if (move === null) return 'snapback';
268 history = game.history({ verbose: true });
269 move_override = history.length;
272 // update the board position after the piece snap
273 // for castling, en passant, pawn promotion
274 var onSnapEnd = function() {
275 var game = get_game();
276 board.position(game.fen());
280 var init = function() {
282 board = new window.ChessBoard('board', {
285 onDragStart: onDragStart,
291 $(window).keyup(function(event) {
292 if (event.which == 39) {
294 } else if (event.which == 37) {
301 $(document).ready(init);