4 * Version of this script. If the server returns a version larger than
5 * this, it is a sign we should reload to upgrade ourselves.
10 var SCRIPT_VERSION = 2015062104;
13 * The current backend URL.
18 var backend_url = "/analysis.pl";
20 /** @type {window.ChessBoard} @private */
24 * The most recent analysis data we have from the server
25 * (about the most recent position).
29 var current_analysis_data = null;
32 * If we are displaying previous analysis, this is non-null,
33 * and will override most of current_analysis_data.
38 var displayed_analysis_data = null;
53 /** @type {Array.<Array.<boolean>>} */
54 var occupied_by_arrows = [];
56 var refutation_lines = [];
58 /** @type {!number} @private */
61 /** @type {!string} @private */
64 /** @type {number} @private */
67 /** @type {boolean} @private */
68 var sort_refutation_lines_by_score = true;
70 /** @type {boolean} @private */
71 var truncate_display_history = true;
73 /** @type {!string|undefined} @private */
74 var highlight_from = undefined;
76 /** @type {!string|undefined} @private */
77 var highlight_to = undefined;
79 /** @type {?jQuery} @private */
80 var highlighted_move = null;
82 /** @type {?number} @private */
85 /** @type {boolean} @private */
86 var enable_sound = false;
89 * Our best estimate of how many milliseconds we need to add to
90 * new Date() to get the true UTC time. Calibrated against the
96 var client_clock_offset_ms = null;
98 var clock_timer = null;
100 /** The current position on the board, represented as a FEN string.
108 * uci_pv: Array.<string>,
109 * pretty_pv: Array.<string>,
114 /** @type {Array.<DisplayLine>}
117 var display_lines = [];
119 /** @type {?DisplayLine} @private */
120 var current_display_line = null;
122 /** @type {boolean} @private */
123 var current_display_line_is_history = false;
125 /** @type {?number} @private */
126 var current_display_move = null;
129 * The current backend request to get main analysis (not history), if any,
130 * so that we can abort it.
135 var current_analysis_xhr = null;
138 * The current timer to fire off a request to get main analysis (not history),
139 * if any, so that we can abort it.
144 var current_analysis_request_timer = null;
147 * The current backend request to get historic data, if any.
152 var current_historic_xhr = null;
154 var supports_html5_storage = function() {
156 return 'localStorage' in window && window['localStorage'] !== null;
162 // Make the unique token persistent so people refreshing the page won't count twice.
163 // Of course, you can never fully protect against people deliberately wanting to spam.
164 var get_unique = function() {
165 var use_local_storage = supports_html5_storage();
166 if (use_local_storage && localStorage['unique']) {
167 return localStorage['unique'];
169 var unique = Math.random();
170 if (use_local_storage) {
171 localStorage['unique'] = unique;
176 var request_update = function() {
177 current_analysis_request_timer = null;
179 current_analysis_xhr = $.ajax({
180 url: backend_url + "?ims=" + ims + "&unique=" + unique
181 }).done(function(data, textstatus, xhr) {
182 sync_server_clock(xhr.getResponseHeader('Date'));
183 ims = xhr.getResponseHeader('X-RGLM');
184 var num_viewers = xhr.getResponseHeader('X-RGNV');
186 if (Array.isArray(data)) {
187 new_data = JSON.parse(JSON.stringify(current_analysis_data));
188 JSON_delta.patch(new_data, data);
193 var minimum_version = xhr.getResponseHeader('X-RGMV');
194 if (minimum_version && minimum_version > SCRIPT_VERSION) {
195 // Upgrade to latest version with a force-reload.
196 location.reload(true);
199 possibly_play_sound(current_analysis_data, new_data);
200 current_analysis_data = new_data;
201 update_board(current_analysis_data, displayed_analysis_data);
202 update_num_viewers(num_viewers);
205 current_analysis_request_timer = setTimeout(function() { request_update(); }, 100);
206 }).fail(function(jqXHR, textStatus, errorThrown) {
207 if (textStatus === "abort") {
208 // Aborted because we are switching backends. Abandon and don't retry,
209 // because another one is already started for us.
211 // Backend error or similar. Wait ten seconds, then try again.
212 current_analysis_request_timer = setTimeout(function() { request_update(); }, 10000);
217 var possibly_play_sound = function(old_data, new_data) {
221 if (old_data === null) {
224 var ding = document.getElementById('ding');
225 if (ding && ding.play) {
226 if (old_data['position'] && old_data['position']['fen'] &&
227 new_data['position'] && new_data['position']['fen'] &&
228 (old_data['position']['fen'] !== new_data['position']['fen'] ||
229 old_data['position']['move_num'] !== new_data['position']['move_num'])) {
236 * @type {!string} server_date_string
238 var sync_server_clock = function(server_date_string) {
239 var server_time_ms = new Date(server_date_string).getTime();
240 var client_time_ms = new Date().getTime();
241 var estimated_offset_ms = server_time_ms - client_time_ms;
243 // In order not to let the noise move us too much back and forth
244 // (the server only has one-second resolution anyway), we only
245 // change an existing skew if we are at least five seconds off.
246 if (client_clock_offset_ms === null ||
247 Math.abs(estimated_offset_ms - client_clock_offset_ms) > 5000) {
248 client_clock_offset_ms = estimated_offset_ms;
252 var clear_arrows = function() {
253 for (var i = 0; i < arrows.length; ++i) {
255 if (arrows[i].svg.parentElement) {
256 arrows[i].svg.parentElement.removeChild(arrows[i].svg);
258 delete arrows[i].svg;
263 occupied_by_arrows = [];
264 for (var y = 0; y < 8; ++y) {
265 occupied_by_arrows.push([false, false, false, false, false, false, false, false]);
269 var redraw_arrows = function() {
270 for (var i = 0; i < arrows.length; ++i) {
271 position_arrow(arrows[i]);
275 /** @param {!number} x
278 var sign = function(x) {
288 /** See if drawing this arrow on the board would cause unduly amount of confusion.
289 * @param {!string} from The square the arrow is from (e.g. e4).
290 * @param {!string} to The square the arrow is to (e.g. e4).
293 var interfering_arrow = function(from, to) {
294 var from_col = from.charCodeAt(0) - "a1".charCodeAt(0);
295 var from_row = from.charCodeAt(1) - "a1".charCodeAt(1);
296 var to_col = to.charCodeAt(0) - "a1".charCodeAt(0);
297 var to_row = to.charCodeAt(1) - "a1".charCodeAt(1);
299 occupied_by_arrows[from_row][from_col] = true;
301 // Knight move: Just check that we haven't been at the destination before.
302 if ((Math.abs(to_col - from_col) == 2 && Math.abs(to_row - from_row) == 1) ||
303 (Math.abs(to_col - from_col) == 1 && Math.abs(to_row - from_row) == 2)) {
304 return occupied_by_arrows[to_row][to_col];
307 // Sliding piece: Check if anything except the from-square is seen before.
308 var dx = sign(to_col - from_col);
309 var dy = sign(to_row - from_row);
315 if (occupied_by_arrows[y][x]) {
318 occupied_by_arrows[y][x] = true;
319 } while (x != to_col || y != to_row);
324 /** Find a point along the coordinate system given by the given line,
325 * <t> units forward from the start of the line, <u> units to the right of it.
326 * @param {!number} x1
327 * @param {!number} x2
328 * @param {!number} y1
329 * @param {!number} y2
332 * @return {!string} The point in "x y" form, suitable for SVG paths.
334 var point_from_start = function(x1, y1, x2, y2, t, u) {
338 var norm = 1.0 / Math.sqrt(dx * dx + dy * dy);
342 var x = x1 + dx * t + dy * u;
343 var y = y1 + dy * t - dx * u;
347 /** Find a point along the coordinate system given by the given line,
348 * <t> units forward from the end of the line, <u> units to the right of it.
349 * @param {!number} x1
350 * @param {!number} x2
351 * @param {!number} y1
352 * @param {!number} y2
355 * @return {!string} The point in "x y" form, suitable for SVG paths.
357 var point_from_end = function(x1, y1, x2, y2, t, u) {
361 var norm = 1.0 / Math.sqrt(dx * dx + dy * dy);
365 var x = x2 + dx * t + dy * u;
366 var y = y2 + dy * t - dx * u;
370 var position_arrow = function(arrow) {
372 if (arrow.svg.parentElement) {
373 arrow.svg.parentElement.removeChild(arrow.svg);
377 if (current_display_line !== null && !current_display_line_is_history) {
381 var pos = $(".square-a8").position();
383 var zoom_factor = $("#board").width() / 400.0;
384 var line_width = arrow.line_width * zoom_factor;
385 var arrow_size = arrow.arrow_size * zoom_factor;
387 var square_width = $(".square-a8").width();
388 var from_y = (7 - arrow.from_row + 0.5)*square_width;
389 var to_y = (7 - arrow.to_row + 0.5)*square_width;
390 var from_x = (arrow.from_col + 0.5)*square_width;
391 var to_x = (arrow.to_col + 0.5)*square_width;
393 var SVG_NS = "http://www.w3.org/2000/svg";
394 var XHTML_NS = "http://www.w3.org/1999/xhtml";
395 var svg = document.createElementNS(SVG_NS, "svg");
396 svg.setAttribute("width", /** @type{number} */ ($("#board").width()));
397 svg.setAttribute("height", /** @type{number} */ ($("#board").height()));
398 svg.setAttribute("style", "position: absolute");
399 svg.setAttribute("position", "absolute");
400 svg.setAttribute("version", "1.1");
401 svg.setAttribute("class", "c1");
402 svg.setAttribute("xmlns", XHTML_NS);
410 var outline = document.createElementNS(SVG_NS, "path");
411 outline.setAttribute("d", "M " + point_from_start(x1, y1, x2, y2, arrow_size / 2, 0) + " L " + point_from_end(x1, y1, x2, y2, -arrow_size / 2, 0));
412 outline.setAttribute("xmlns", XHTML_NS);
413 outline.setAttribute("stroke", "#666");
414 outline.setAttribute("stroke-width", line_width + 2);
415 outline.setAttribute("fill", "none");
416 svg.appendChild(outline);
418 var path = document.createElementNS(SVG_NS, "path");
419 path.setAttribute("d", "M " + point_from_start(x1, y1, x2, y2, arrow_size / 2, 0) + " L " + point_from_end(x1, y1, x2, y2, -arrow_size / 2, 0));
420 path.setAttribute("xmlns", XHTML_NS);
421 path.setAttribute("stroke", arrow.fg_color);
422 path.setAttribute("stroke-width", line_width);
423 path.setAttribute("fill", "none");
424 svg.appendChild(path);
426 // Then the arrow head.
427 var head = document.createElementNS(SVG_NS, "path");
428 head.setAttribute("d",
429 "M " + point_from_end(x1, y1, x2, y2, 0, 0) +
430 " L " + point_from_end(x1, y1, x2, y2, -arrow_size, -arrow_size / 2) +
431 " L " + point_from_end(x1, y1, x2, y2, -arrow_size * .623, 0.0) +
432 " L " + point_from_end(x1, y1, x2, y2, -arrow_size, arrow_size / 2) +
433 " L " + point_from_end(x1, y1, x2, y2, 0, 0));
434 head.setAttribute("xmlns", XHTML_NS);
435 head.setAttribute("stroke", "#000");
436 head.setAttribute("stroke-width", "1");
437 head.setAttribute("fill", arrow.fg_color);
438 svg.appendChild(head);
440 $(svg).css({ top: pos.top, left: pos.left });
441 document.body.appendChild(svg);
446 * @param {!string} from_square
447 * @param {!string} to_square
448 * @param {!string} fg_color
449 * @param {number} line_width
450 * @param {number} arrow_size
452 var create_arrow = function(from_square, to_square, fg_color, line_width, arrow_size) {
453 var from_col = from_square.charCodeAt(0) - "a1".charCodeAt(0);
454 var from_row = from_square.charCodeAt(1) - "a1".charCodeAt(1);
455 var to_col = to_square.charCodeAt(0) - "a1".charCodeAt(0);
456 var to_row = to_square.charCodeAt(1) - "a1".charCodeAt(1);
464 line_width: line_width,
465 arrow_size: arrow_size,
469 position_arrow(arrow);
473 var compare_by_sort_key = function(refutation_lines, a, b) {
474 var ska = refutation_lines[a]['sort_key'];
475 var skb = refutation_lines[b]['sort_key'];
476 if (ska < skb) return -1;
477 if (ska > skb) return 1;
481 var compare_by_score = function(refutation_lines, a, b) {
482 var sa = parseInt(refutation_lines[b]['score_sort_key'], 10);
483 var sb = parseInt(refutation_lines[a]['score_sort_key'], 10);
488 * Fake multi-PV using the refutation lines. Find all “relevant” moves,
489 * sorted by quality, descending.
491 * @param {!Object} data
492 * @param {number} margin The maximum number of centipawns worse than the
493 * best move can be and still be included.
494 * @return {Array.<string>} The UCI representation (e.g. e1g1) of all
495 * moves, in score order.
497 var find_nonstupid_moves = function(data, margin) {
498 // First of all, if there are any moves that are more than 0.5 ahead of
499 // the primary move, the refutation lines are probably bunk, so just
501 var best_score = undefined;
502 var pv_score = undefined;
503 for (var move in data['refutation_lines']) {
504 var score = parseInt(data['refutation_lines'][move]['score_sort_key'], 10);
505 if (move == data['pv_uci'][0]) {
508 if (best_score === undefined || score > best_score) {
511 if (!(data['refutation_lines'][move]['depth'] >= 8)) {
516 if (best_score - pv_score > 50) {
520 // Now find all moves that are within “margin” of the best score.
521 // The PV move will always be first.
523 for (var move in data['refutation_lines']) {
524 var score = parseInt(data['refutation_lines'][move]['score_sort_key'], 10);
525 if (move != data['pv_uci'][0] && best_score - score <= margin) {
529 moves = moves.sort(function(a, b) { return compare_by_score(data['refutation_lines'], a, b) });
530 moves.unshift(data['pv_uci'][0]);
539 var thousands = function(x) {
540 return String(x).split('').reverse().join('').replace(/(\d{3}\B)/g, '$1,').split('').reverse().join('');
544 * @param {!string} fen
545 * @param {Array.<string>} pretty_pv
546 * @param {number} move_num
547 * @param {!string} toplay
548 * @param {number=} opt_limit
549 * @param {boolean=} opt_showlast
551 var add_pv = function(fen, pretty_pv, move_num, toplay, opt_limit, opt_showlast) {
554 pretty_pv: pretty_pv,
555 line_number: display_lines.length
557 return print_pv(display_lines.length - 1, pretty_pv, move_num, toplay, opt_limit, opt_showlast);
561 * @param {number} line_num
562 * @param {Array.<string>} pretty_pv
563 * @param {number} move_num
564 * @param {!string} toplay
565 * @param {number=} opt_limit
566 * @param {boolean=} opt_showlast
568 var print_pv = function(line_num, pretty_pv, move_num, toplay, opt_limit, opt_showlast) {
571 if (opt_limit && opt_showlast && pretty_pv.length > opt_limit) {
572 // Truncate the PV at the beginning (instead of at the end).
573 // We assume here that toplay is 'W'. We also assume that if
574 // opt_showlast is set, then it is the history, and thus,
575 // the UI should be to expand the history.
576 pv = '(<a class="move" href="javascript:collapse_history(false)">…</a>) ';
577 i = pretty_pv.length - opt_limit;
582 } else if (toplay == 'B' && pretty_pv.length > 0) {
583 var move = "<a class=\"move\" id=\"automove" + line_num + "-0\" href=\"javascript:show_line(" + line_num + ", " + 0 + ");\">" + pretty_pv[0] + "</a>";
584 pv = move_num + '. … ' + move;
589 for ( ; i < pretty_pv.length; ++i) {
590 var move = "<a class=\"move\" id=\"automove" + line_num + "-" + i + "\" href=\"javascript:show_line(" + line_num + ", " + i + ");\">" + pretty_pv[i] + "</a>";
593 if (i > opt_limit && !opt_showlast) {
599 pv += move_num + '. ' + move;
610 var update_highlight = function() {
611 $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
612 if ((current_display_line === null || current_display_line_is_history) &&
613 highlight_from !== undefined && highlight_to !== undefined) {
614 $("#board").find('.square-' + highlight_from).addClass('nonuglyhighlight');
615 $("#board").find('.square-' + highlight_to).addClass('nonuglyhighlight');
619 var update_history = function() {
620 if (display_lines[0] === null || display_lines[0].pretty_pv.length == 0) {
621 $("#history").html("No history");
622 } else if (truncate_display_history) {
623 $("#history").html(print_pv(0, display_lines[0].pretty_pv, 1, 'W', 8, true));
626 '(<a class="move" href="javascript:collapse_history(true)">collapse</a>) ' +
627 print_pv(0, display_lines[0].pretty_pv, 1, 'W'));
632 * @param {!boolean} truncate_history
634 var collapse_history = function(truncate_history) {
635 truncate_display_history = truncate_history;
638 window['collapse_history'] = collapse_history;
640 var update_refutation_lines = function() {
644 if (display_lines.length > 2) {
645 display_lines = [ display_lines[0], display_lines[1] ];
648 var tbl = $("#refutationlines");
652 for (var move in refutation_lines) {
655 var compare = sort_refutation_lines_by_score ? compare_by_score : compare_by_sort_key;
656 moves = moves.sort(function(a, b) { return compare(refutation_lines, a, b) });
657 for (var i = 0; i < moves.length; ++i) {
658 var line = refutation_lines[moves[i]];
660 var tr = document.createElement("tr");
662 var move_td = document.createElement("td");
663 tr.appendChild(move_td);
664 $(move_td).addClass("move");
665 if (line['pv_pretty'].length == 0) {
666 $(move_td).text(line['pretty_move']);
668 var move = "<a class=\"move\" href=\"javascript:show_line(" + display_lines.length + ", " + 0 + ");\">" + line['pretty_move'] + "</a>";
669 $(move_td).html(move);
672 var score_td = document.createElement("td");
673 tr.appendChild(score_td);
674 $(score_td).addClass("score");
675 $(score_td).text(line['pretty_score']);
677 var depth_td = document.createElement("td");
678 tr.appendChild(depth_td);
679 $(depth_td).addClass("depth");
680 $(depth_td).text("d" + line['depth']);
682 var pv_td = document.createElement("td");
683 tr.appendChild(pv_td);
684 $(pv_td).addClass("pv");
685 $(pv_td).html(add_pv(fen, line['pv_pretty'], move_num, toplay, 10));
690 // Make one of the links clickable and the other nonclickable.
691 if (sort_refutation_lines_by_score) {
692 $("#sortbyscore0").html("<a href=\"javascript:resort_refutation_lines(false)\">Move</a>");
693 $("#sortbyscore1").html("<strong>Score</strong>");
695 $("#sortbyscore0").html("<strong>Move</strong>");
696 $("#sortbyscore1").html("<a href=\"javascript:resort_refutation_lines(true)\">Score</a>");
701 * @param {?string} fen
702 * @param {Array.<string>} moves
703 * @param {number} last_move
705 var chess_from = function(fen, moves, last_move) {
706 var hiddenboard = new Chess();
708 hiddenboard.load(fen);
710 for (var i = 0; i <= last_move; ++i) {
711 if (moves[i] === '0-0') {
712 hiddenboard.move('O-O');
713 } else if (moves[i] === '0-0-0') {
714 hiddenboard.move('O-O-O');
716 hiddenboard.move(moves[i]);
723 * @param {Object} data
724 * @param {?Object} display_data
726 var update_board = function(current_data, display_data) {
727 var data = display_data || current_data;
731 // Print the history. This is pretty much the only thing that's
732 // unconditionally taken from current_data (we're not interested in
733 // historic history).
734 if (current_data['position']['pretty_history']) {
735 add_pv('start', current_data['position']['pretty_history'], 1, 'W', 8, true);
737 display_lines.push(null);
741 // Games currently in progress, if any.
742 $("#games").text("");
743 if (current_data['games']) {
744 var games_div = document.getElementById('games');
745 for (var game_num = 0; game_num < current_data['games'].length; ++game_num) {
746 var game = current_data['games'][game_num];
747 var game_span = document.createElement("span");
748 game_span.setAttribute("class", "game");
750 var game_name = document.createTextNode(game['name']);
751 if (game['url'] === backend_url) {
752 game_span.appendChild(game_name);
754 var game_a = document.createElement("a");
755 game_a.setAttribute("href", "javascript:switch_backend('" + game['url'] + "')");
756 game_a.appendChild(game_name);
757 game_span.appendChild(game_a);
759 games_div.appendChild(game_span);
763 // The headline. Names are always fetched from current_data;
764 // the rest can depend a bit.
767 current_data['position']['player_w'] && current_data['position']['player_b']) {
768 headline = current_data['position']['player_w'] + '–' +
769 current_data['position']['player_b'] + ', analysis';
771 headline = 'Analysis';
774 // Credits, where applicable. Note that we don't want the footer to change a lot
775 // when e.g. viewing history, so if any of these changed during the game,
776 // use the current one still.
777 if (current_data['using_lomonosov']) {
778 $("#lomonosov").show();
780 $("#lomonosov").hide();
783 // Credits: The engine name/version.
784 if (current_data['engine'] && current_data['engine']['name'] !== null) {
785 $("#engineid").text(current_data['engine']['name']);
788 // Credits: The engine URL.
789 if (current_data['engine'] && current_data['engine']['url']) {
790 $("#engineid").attr("href", current_data['engine']['url']);
792 $("#engineid").removeAttr("href");
795 // Credits: Engine details.
796 if (current_data['engine'] && current_data['engine']['details']) {
797 $("#enginedetails").text(" (" + current_data['engine']['details'] + ")");
799 $("#enginedetails").text("");
802 // Credits: Move source, possibly with URL.
803 if (current_data['move_source'] && current_data['move_source_url']) {
804 $("#movesource").text("Moves provided by ");
805 var movesource_a = document.createElement("a");
806 movesource_a.setAttribute("href", current_data['move_source_url']);
807 var movesource_text = document.createTextNode(current_data['move_source']);
808 movesource_a.appendChild(movesource_text);
809 var movesource_period = document.createTextNode(".");
810 document.getElementById("movesource").appendChild(movesource_a);
811 document.getElementById("movesource").appendChild(movesource_period);
812 } else if (current_data['move_source']) {
813 $("#movesource").text("Moves provided by " + current_data['move_source'] + ".");
815 $("#movesource").text("");
820 // Displaying some non-current position, pick out the last move
821 // from the history. This will work even if the fetch failed.
822 last_move = format_halfmove_with_number(
823 current_display_line.pretty_pv[current_display_move],
824 current_display_move + 1);
825 headline += ' after ' + last_move;
826 } else if (data['position']['last_move'] !== 'none') {
827 last_move = format_move_with_number(
828 data['position']['last_move'],
829 data['position']['move_num'],
830 data['position']['toplay'] == 'W');
831 headline += ' after ' + last_move;
835 $("#headline").text(headline);
837 // The <title> contains a very brief headline.
838 var title_elems = [];
839 if (data['short_score'] !== undefined && data['short_score'] !== null) {
840 title_elems.push(data['short_score'].replace(/^ /, ""));
842 if (last_move !== null) {
843 title_elems.push(last_move);
846 if (title_elems.length != 0) {
847 document.title = '(' + title_elems.join(', ') + ') analysis.sesse.net';
849 document.title = 'analysis.sesse.net';
852 // The last move (shown by highlighting the from and to squares).
853 if (data['position'] && data['position']['last_move_uci']) {
854 highlight_from = data['position']['last_move_uci'].substr(0, 2);
855 highlight_to = data['position']['last_move_uci'].substr(2, 2);
856 } else if (current_display_line_is_history && current_display_move >= 0) {
857 // We don't have historic analysis for this position, but we
858 // can reconstruct what the last move was by just replaying
860 var hiddenboard = chess_from(null, current_display_line.pretty_pv, current_display_move);
861 var moves = hiddenboard.history({ verbose: true });
862 var last_move = moves.pop();
863 highlight_from = last_move.from;
864 highlight_to = last_move.to;
866 highlight_from = highlight_to = undefined;
870 if (data['failed']) {
871 $("#score").text("No analysis for this move");
873 $("#searchstats").html(" ");
874 $("#refutationlines").empty();
875 $("#whiteclock").empty();
876 $("#blackclock").empty();
877 refutation_lines = [];
878 update_refutation_lines();
880 update_displayed_line();
887 if (data['score'] !== null) {
888 $("#score").text(data['score']);
892 if (data['tablebase'] == 1) {
893 $("#searchstats").text("Tablebase result");
894 } else if (data['nodes'] && data['nps'] && data['depth']) {
895 var stats = thousands(data['nodes']) + ' nodes, ' + thousands(data['nps']) + ' nodes/sec, depth ' + data['depth'] + ' ply';
896 if (data['seldepth']) {
897 stats += ' (' + data['seldepth'] + ' selective)';
899 if (data['tbhits'] && data['tbhits'] > 0) {
900 if (data['tbhits'] == 1) {
901 stats += ', one Syzygy hit';
903 stats += ', ' + thousands(data['tbhits']) + ' Syzygy hits';
907 $("#searchstats").text(stats);
909 $("#searchstats").text("");
912 // Update the board itself.
913 fen = data['position']['fen'];
914 update_displayed_line();
917 $("#pv").html(add_pv(data['position']['fen'], data['pv_pretty'], data['position']['move_num'], data['position']['toplay']));
919 // Update the PV arrow.
921 if (data['pv_uci'].length >= 1) {
922 // draw a continuation arrow as long as it's the same piece
923 for (var i = 0; i < data['pv_uci'].length; i += 2) {
924 var from = data['pv_uci'][i].substr(0, 2);
925 var to = data['pv_uci'][i].substr(2,4);
926 if ((i >= 2 && from != data['pv_uci'][i - 2].substr(2, 2)) ||
927 interfering_arrow(from, to)) {
930 create_arrow(from, to, '#f66', 6, 20);
933 var alt_moves = find_nonstupid_moves(data, 30);
934 for (var i = 1; i < alt_moves.length && i < 3; ++i) {
935 create_arrow(alt_moves[i].substr(0, 2),
936 alt_moves[i].substr(2, 2), '#f66', 1, 10);
940 // See if all semi-reasonable moves have only one possible response.
941 if (data['pv_uci'].length >= 2) {
942 var nonstupid_moves = find_nonstupid_moves(data, 300);
943 var response = data['pv_uci'][1];
944 for (var i = 0; i < nonstupid_moves.length; ++i) {
945 if (nonstupid_moves[i] == data['pv_uci'][0]) {
946 // ignore the PV move for refutation lines.
949 if (!data['refutation_lines'] ||
950 !data['refutation_lines'][nonstupid_moves[i]] ||
951 !data['refutation_lines'][nonstupid_moves[i]]['pv_uci'] ||
952 data['refutation_lines'][nonstupid_moves[i]]['pv_uci'].length < 1) {
953 // Incomplete PV, abort.
954 response = undefined;
957 var this_response = data['refutation_lines'][nonstupid_moves[i]]['pv_uci'][1];
958 if (response !== this_response) {
959 // Different response depending on lines, abort.
960 response = undefined;
965 if (nonstupid_moves.length > 0 && response !== undefined) {
966 create_arrow(response.substr(0, 2),
967 response.substr(2, 2), '#66f', 6, 20);
971 // Update the refutation lines.
972 fen = data['position']['fen'];
973 move_num = data['position']['move_num'];
974 toplay = data['position']['toplay'];
975 refutation_lines = data['refutation_lines'];
976 update_refutation_lines();
978 // Update the sparkline last, since its size depends on how everything else reflowed.
979 update_sparkline(data);
982 var update_sparkline = function(data) {
983 if (data && data['score_history']) {
984 var first_move_num = undefined;
985 for (var halfmove_num in data['score_history']) {
986 halfmove_num = parseInt(halfmove_num);
987 if (first_move_num === undefined || halfmove_num < first_move_num) {
988 first_move_num = halfmove_num;
991 if (first_move_num !== undefined) {
992 var last_move_num = data['position']['move_num'] * 2 - 3;
993 if (data['position']['toplay'] === 'B') {
997 // Possibly truncate some moves if we don't have enough width.
998 // FIXME: Sometimes width() for #scorecontainer (and by extent,
999 // #scoresparkcontainer) on Chrome for mobile seems to start off
1000 // at something very small, and then suddenly snap back into place.
1002 var max_moves = Math.floor($("#scoresparkcontainer").width() / 5) - 5;
1003 if (last_move_num - first_move_num > max_moves) {
1004 first_move_num = last_move_num - max_moves;
1007 var min_score = -100;
1008 var max_score = 100;
1009 var last_score = null;
1011 for (var halfmove_num = first_move_num; halfmove_num <= last_move_num; ++halfmove_num) {
1012 if (data['score_history'][halfmove_num]) {
1013 var score = data['score_history'][halfmove_num][0];
1014 if (score < min_score) min_score = score;
1015 if (score > max_score) max_score = score;
1016 last_score = data['score_history'][halfmove_num][0];
1018 scores.push(last_score);
1020 if (data['plot_score']) {
1021 scores.push(data['plot_score']);
1023 // FIXME: at some widths, calling sparkline() seems to push
1024 // #scorecontainer under the board.
1025 $("#scorespark").sparkline(scores, {
1028 chartRangeMin: min_score,
1029 chartRangeMax: max_score,
1030 tooltipFormatter: function(sparkline, options, fields) {
1031 return format_tooltip(data, fields[0].offset + first_move_num);
1035 $("#scorespark").text("");
1038 $("#scorespark").text("");
1043 * @param {number} num_viewers
1045 var update_num_viewers = function(num_viewers) {
1046 if (num_viewers === null) {
1047 $("#numviewers").text("");
1048 } else if (num_viewers == 1) {
1049 $("#numviewers").text("You are the only current viewer");
1051 $("#numviewers").text(num_viewers + " current viewers");
1055 var update_clock = function() {
1056 clearTimeout(clock_timer);
1058 var data = displayed_analysis_data || current_analysis_data;
1059 if (data['position']) {
1060 var result = data['position']['result'];
1061 if (result === '1-0') {
1062 $("#whiteclock").text("1");
1063 $("#blackclock").text("0");
1064 $("#whiteclock").removeClass("running-clock");
1065 $("#blackclock").removeClass("running-clock");
1068 if (result === '1/2-1/2') {
1069 $("#whiteclock").text("1/2");
1070 $("#blackclock").text("1/2");
1071 $("#whiteclock").removeClass("running-clock");
1072 $("#blackclock").removeClass("running-clock");
1075 if (result === '0-1') {
1076 $("#whiteclock").text("0");
1077 $("#blackclock").text("1");
1078 $("#whiteclock").removeClass("running-clock");
1079 $("#blackclock").removeClass("running-clock");
1084 var white_clock_ms = null;
1085 var black_clock_ms = null;
1086 var show_seconds = false;
1089 if (data['position'] &&
1090 data['position']['white_clock'] &&
1091 data['position']['black_clock']) {
1092 white_clock_ms = data['position']['white_clock'] * 1000;
1093 black_clock_ms = data['position']['black_clock'] * 1000;
1096 // Dynamic clock (only one, obviously).
1098 if (data['position']['white_clock_target']) {
1100 $("#whiteclock").addClass("running-clock");
1101 $("#blackclock").removeClass("running-clock");
1102 } else if (data['position']['black_clock_target']) {
1104 $("#whiteclock").removeClass("running-clock");
1105 $("#blackclock").addClass("running-clock");
1107 $("#whiteclock").removeClass("running-clock");
1108 $("#blackclock").removeClass("running-clock");
1112 var now = new Date().getTime() + client_clock_offset_ms;
1113 remaining_ms = data['position'][color + '_clock_target'] * 1000 - now;
1114 if (color === "white") {
1115 white_clock_ms = remaining_ms;
1117 black_clock_ms = remaining_ms;
1121 if (white_clock_ms === null || black_clock_ms === null) {
1122 $("#whiteclock").empty();
1123 $("#blackclock").empty();
1127 // If either player has ten minutes or less left, add the second counters.
1128 var show_seconds = (white_clock_ms < 60 * 10 * 1000 || black_clock_ms < 60 * 10 * 1000);
1131 // See when the clock will change next, and update right after that.
1134 next_update_ms = remaining_ms % 1000 + 100;
1136 next_update_ms = remaining_ms % 60000 + 100;
1138 clock_timer = setTimeout(update_clock, next_update_ms);
1141 $("#whiteclock").text(format_clock(white_clock_ms, show_seconds));
1142 $("#blackclock").text(format_clock(black_clock_ms, show_seconds));
1146 * @param {Number} remaining_ms
1147 * @param {boolean} show_seconds
1149 var format_clock = function(remaining_ms, show_seconds) {
1150 if (remaining_ms <= 0) {
1158 var remaining = Math.floor(remaining_ms / 1000);
1159 var seconds = remaining % 60;
1160 remaining = (remaining - seconds) / 60;
1161 var minutes = remaining % 60;
1162 remaining = (remaining - minutes) / 60;
1163 var hours = remaining;
1165 return format_2d(hours) + ":" + format_2d(minutes) + ":" + format_2d(seconds);
1167 return format_2d(hours) + ":" + format_2d(minutes);
1174 var format_2d = function(x) {
1183 * @param {string} move
1184 * @param {Number} move_num
1185 * @param {boolean} white_to_play
1187 var format_move_with_number = function(move, move_num, white_to_play) {
1189 if (white_to_play) {
1190 ret = (move_num - 1) + '… ';
1192 ret = move_num + '. ';
1199 * @param {string} move
1200 * @param {Number} halfmove_num
1202 var format_halfmove_with_number = function(move, halfmove_num) {
1203 return format_move_with_number(
1205 Math.floor(halfmove_num / 2) + 1,
1206 halfmove_num % 2 == 0);
1210 * @param {Object} data
1211 * @param {Number} halfmove_num
1213 var format_tooltip = function(data, halfmove_num) {
1214 if (data['score_history'][halfmove_num] ||
1215 halfmove_num === data['position']['pretty_history'].length) {
1218 if (halfmove_num === data['position']['pretty_history'].length) {
1219 move = data['position']['last_move'];
1220 short_score = data['short_score'];
1222 move = data['position']['pretty_history'][halfmove_num];
1223 short_score = data['score_history'][halfmove_num][1];
1225 var move_with_number = format_halfmove_with_number(move, halfmove_num);
1227 return "After " + move_with_number + ": " + short_score;
1229 for (var i = halfmove_num; i --> 0; ) {
1230 if (data['score_history'][i]) {
1231 var move = data['position']['pretty_history'][i];
1232 return "[Analysis kept from " + format_halfmove_with_number(move, i) + "]";
1239 * @param {boolean} sort_by_score
1241 var resort_refutation_lines = function(sort_by_score) {
1242 sort_refutation_lines_by_score = sort_by_score;
1243 if (supports_html5_storage()) {
1244 localStorage['sort_refutation_lines_by_score'] = sort_by_score ? 1 : 0;
1246 update_refutation_lines();
1248 window['resort_refutation_lines'] = resort_refutation_lines;
1251 * @param {boolean} truncate_history
1253 var set_truncate_history = function(truncate_history) {
1254 truncate_display_history = truncate_history;
1255 update_refutation_lines();
1257 window['set_truncate_history'] = set_truncate_history;
1260 * @param {number} line_num
1261 * @param {number} move_num
1263 var show_line = function(line_num, move_num) {
1264 if (line_num == -1) {
1265 current_display_line = null;
1266 current_display_move = null;
1267 if (displayed_analysis_data) {
1268 // TODO: Support exiting to history position if we are in an
1269 // analysis line of a history position.
1270 displayed_analysis_data = null;
1271 update_board(current_analysis_data, displayed_analysis_data);
1274 current_display_line = display_lines[line_num];
1275 current_display_move = move_num;
1277 current_display_line_is_history = (line_num == 0);
1279 update_historic_analysis();
1280 update_displayed_line();
1284 window['show_line'] = show_line;
1286 var prev_move = function() {
1287 if (current_display_move > -1) {
1288 --current_display_move;
1290 update_historic_analysis();
1291 update_displayed_line();
1293 window['prev_move'] = prev_move;
1295 var next_move = function() {
1296 if (current_display_line && current_display_move < current_display_line.pretty_pv.length - 1) {
1297 ++current_display_move;
1299 update_historic_analysis();
1300 update_displayed_line();
1302 window['next_move'] = next_move;
1304 var update_historic_analysis = function() {
1305 if (!current_display_line_is_history) {
1308 if (current_display_move == current_display_line.pretty_pv.length - 1) {
1309 displayed_analysis_data = null;
1310 update_board(current_analysis_data, displayed_analysis_data);
1313 // Fetch old analysis for this line if it exists.
1314 var hiddenboard = chess_from(null, current_display_line.pretty_pv, current_display_move);
1315 var filename = "/history/move" + (current_display_move + 1) + "-" +
1316 hiddenboard.fen().replace(/ /g, '_').replace(/\//g, '-') + ".json";
1318 current_historic_xhr = $.ajax({
1320 }).done(function(data, textstatus, xhr) {
1321 displayed_analysis_data = data;
1322 update_board(current_analysis_data, displayed_analysis_data);
1323 }).fail(function(jqXHR, textStatus, errorThrown) {
1324 if (textStatus === "abort") {
1325 // Aborted because we are switching backends. Don't do anything;
1326 // we will already have been cleared.
1328 displayed_analysis_data = {'failed': true};
1329 update_board(current_analysis_data, displayed_analysis_data);
1335 * @param {string} fen
1337 var update_imbalance = function(fen) {
1338 var hiddenboard = new Chess(fen);
1339 var imbalance = {'k': 0, 'q': 0, 'r': 0, 'b': 0, 'n': 0, 'p': 0};
1340 for (var row = 0; row < 8; ++row) {
1341 for (var col = 0; col < 8; ++col) {
1342 var col_text = String.fromCharCode('a1'.charCodeAt(0) + col);
1343 var row_text = String.fromCharCode('a1'.charCodeAt(1) + row);
1344 var square = col_text + row_text;
1345 var contents = hiddenboard.get(square);
1346 if (contents !== null) {
1347 if (contents.color === 'w') {
1348 ++imbalance[contents.type];
1350 --imbalance[contents.type];
1355 var white_imbalance = '';
1356 var black_imbalance = '';
1357 for (var piece in imbalance) {
1358 for (var i = 0; i < imbalance[piece]; ++i) {
1359 white_imbalance += '<img src="img/chesspieces/wikipedia/w' + piece.toUpperCase() + '.png" alt="" style="width: 15px;height: 15px;">';
1361 for (var i = 0; i < -imbalance[piece]; ++i) {
1362 black_imbalance += '<img src="img/chesspieces/wikipedia/b' + piece.toUpperCase() + '.png" alt="" style="width: 15px;height: 15px;">';
1365 $('#whiteimbalance').html(white_imbalance);
1366 $('#blackimbalance').html(black_imbalance);
1369 var update_displayed_line = function() {
1370 if (highlighted_move !== null) {
1371 highlighted_move.removeClass('highlight');
1373 if (current_display_line === null) {
1374 $("#linenav").hide();
1375 $("#linemsg").show();
1376 board.position(fen);
1377 update_imbalance(fen);
1381 $("#linenav").show();
1382 $("#linemsg").hide();
1384 if (current_display_move <= 0) {
1385 $("#prevmove").html("Previous");
1387 $("#prevmove").html("<a href=\"javascript:prev_move();\">Previous</a></span>");
1389 if (current_display_move == current_display_line.pretty_pv.length - 1) {
1390 $("#nextmove").html("Next");
1392 $("#nextmove").html("<a href=\"javascript:next_move();\">Next</a></span>");
1395 highlighted_move = $("#automove" + current_display_line.line_number + "-" + current_display_move);
1396 highlighted_move.addClass('highlight');
1398 var hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pretty_pv, current_display_move);
1399 board.position(hiddenboard.fen());
1400 update_imbalance(hiddenboard.fen());
1404 * @param {boolean} param_enable_sound
1406 var set_sound = function(param_enable_sound) {
1407 enable_sound = param_enable_sound;
1409 $("#soundon").html("<strong>On</strong>");
1410 $("#soundoff").html("<a href=\"javascript:set_sound(false)\">Off</a>");
1412 // Seemingly at least Firefox prefers MP3 over Opus; tell it otherwise,
1413 // and also preload the file since the user has selected audio.
1414 var ding = document.getElementById('ding');
1415 if (ding && ding.canPlayType && ding.canPlayType('audio/ogg; codecs="opus"') === 'probably') {
1416 ding.src = 'ding.opus';
1420 $("#soundon").html("<a href=\"javascript:set_sound(true)\">On</a>");
1421 $("#soundoff").html("<strong>Off</strong>");
1423 if (supports_html5_storage()) {
1424 localStorage['enable_sound'] = enable_sound ? 1 : 0;
1427 window['set_sound'] = set_sound;
1430 * @param {string} new_backend_url
1432 var switch_backend = function(new_backend_url) {
1433 // Stop looking at historic data.
1434 current_display_line = null;
1435 current_display_move = null;
1436 displayed_analysis_data = null;
1437 if (current_historic_xhr) {
1438 current_historic_xhr.abort();
1441 // If we already have a backend response going, abort it.
1442 if (current_analysis_xhr) {
1443 current_analysis_xhr.abort();
1446 // Otherwise, we should have a timer going to start a new one.
1448 if (current_analysis_request_timer) {
1449 clearTimeout(current_analysis_request_timer);
1450 current_analysis_request_timer = null;
1453 // Request an immediate fetch with the new backend.
1454 backend_url = new_backend_url;
1455 current_analysis_data = null;
1459 window['switch_backend'] = switch_backend;
1461 var init = function() {
1462 unique = get_unique();
1464 // Load settings from HTML5 local storage if available.
1465 if (supports_html5_storage() && localStorage['enable_sound']) {
1466 set_sound(parseInt(localStorage['enable_sound']));
1470 if (supports_html5_storage() && localStorage['sort_refutation_lines_by_score']) {
1471 sort_refutation_lines_by_score = parseInt(localStorage['sort_refutation_lines_by_score']);
1473 sort_refutation_lines_by_score = true;
1477 board = new window.ChessBoard('board', 'start');
1480 $(window).resize(function() {
1482 update_sparkline(displayed_analysis_data || current_analysis_data);
1486 $(window).keyup(function(event) {
1487 if (event.which == 39) {
1489 } else if (event.which == 37) {
1494 $(document).ready(init);