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 = 2021021300;
13 * The current backend URL.
18 var backend_url = "/analysis.pl";
19 var backend_hash_url = "/hash";
21 /** @type {window.ChessBoard} @private */
24 /** @type {boolean} @private */
25 var board_is_animating = false;
28 * The most recent analysis data we have from the server
29 * (about the most recent position).
33 var current_analysis_data = null;
36 * If we are displaying previous analysis or from hash, this is non-null,
37 * and will override most of current_analysis_data.
42 var displayed_analysis_data = null;
45 * Games currently in progress, if any.
57 var current_games = null;
72 /** @type {Array.<Array.<boolean>>} */
73 var occupied_by_arrows = [];
75 /** Currently displayed refutation lines (on-screen).
76 * Can either come from the current_analysis_data, displayed_analysis_data,
77 * or hash_refutation_lines.
79 var refutation_lines = [];
81 /** Refutation lines from current hash probe.
83 * If non-null, will override refutation lines from the base position.
84 * Note that these are relative to display_fen, not base_fen.
86 var hash_refutation_lines = null;
88 /** @type {!number} @private */
91 /** @type {!string} @private */
94 /** @type {number} @private */
97 /** @type {boolean} @private */
98 var truncate_display_history = true;
100 /** @type {!string|undefined} @private */
101 var highlight_from = undefined;
103 /** @type {!string|undefined} @private */
104 var highlight_to = undefined;
106 /** The HTML object of the move currently being highlighted (in red).
109 var highlighted_move = null;
111 /** Currently suggested/recommended move when dragging.
112 * @type {?{from: !string, to: !string}}
115 var recommended_move = null;
117 /** If reverse-dragging (dragging from the destination square to the
118 * source square), the destination square.
122 var reverse_dragging_from = null;
124 /** @type {?number} @private */
127 /** @type {boolean} @private */
128 var enable_sound = false;
130 /** @type {!number} @private */
134 * Our best estimate of how many milliseconds we need to add to
135 * new Date() to get the true UTC time. Calibrated against the
141 var client_clock_offset_ms = null;
143 var clock_timer = null;
145 /** The current position being analyzed, represented as a FEN string.
146 * Note that this is not necessarily the same as display_fen.
152 /** The current position on the board, represented as a FEN string.
153 * Note that board.fen() does not contain e.g. who is to play.
157 var display_fen = null;
161 * pv: Array.<string>,
164 * scores: Array<{first_move: number, score: Object}>,
165 * start_display_move_num: number
168 * "start_display_move_num" is the (half-)move number to start displaying the PV at.
169 * "score" is also evaluated at this point.
172 /** All PVs that we currently know of.
174 * Element 0 is history (or null if no history).
175 * Element 1 is current main PV, or explored line if nowhere else on the screen.
176 * All remaining elements are refutation lines (multi-PV).
178 * @type {Array.<DisplayLine>}
181 var display_lines = [];
183 /** @type {?DisplayLine} @private */
184 var current_display_line = null;
186 /** @type {boolean} @private */
187 var current_display_line_is_history = false;
189 /** @type {?number} @private */
190 var current_display_move = null;
193 * The current backend request to get main analysis (not history), if any,
194 * so that we can abort it.
199 var current_analysis_xhr = null;
202 * The current timer to fire off a request to get main analysis (not history),
203 * if any, so that we can abort it.
208 var current_analysis_request_timer = null;
211 * The current backend request to get historic data, if any.
216 var current_historic_xhr = null;
219 * The current backend request to get hash probes, if any, so that we can abort it.
224 var current_hash_xhr = null;
227 * The current timer to display hash probe information (it could be waiting on the
228 * board to stop animating), if any, so that we can abort it.
233 var current_hash_display_timer = null;
235 var supports_html5_storage = function() {
237 return 'localStorage' in window && window['localStorage'] !== null;
243 // Make the unique token persistent so people refreshing the page won't count twice.
244 // Of course, you can never fully protect against people deliberately wanting to spam.
245 var get_unique = function() {
246 var use_local_storage = supports_html5_storage();
247 if (use_local_storage && localStorage['unique']) {
248 return localStorage['unique'];
250 var unique = Math.random();
251 if (use_local_storage) {
252 localStorage['unique'] = unique;
257 var request_update = function() {
258 current_analysis_request_timer = null;
260 current_analysis_xhr = $.ajax({
261 url: backend_url + "?ims=" + ims + "&unique=" + unique
262 }).done(function(data, textstatus, xhr) {
263 if (delay_ms === 0) {
264 process_update_response(data, textstatus, xhr);
266 setTimeout(function() { process_update_response(data, textstatus, xhr); }, delay_ms);
270 if (!backend_url.match(/history/)) {
272 current_analysis_request_timer = setTimeout(function() { request_update(); }, timeout);
274 }).fail(function(jqXHR, textStatus, errorThrown) {
275 document.body.style.opacity = null;
276 if (textStatus === "abort") {
277 // Aborted because we are switching backends. Abandon and don't retry,
278 // because another one is already started for us.
280 // Backend error or similar. Wait ten seconds, then try again.
281 current_analysis_request_timer = setTimeout(function() { request_update(); }, 10000);
286 var process_update_response = function(data, textstatus, xhr) {
287 sync_server_clock(xhr.getResponseHeader('Date'));
288 ims = xhr.getResponseHeader('X-RGLM');
289 var num_viewers = xhr.getResponseHeader('X-RGNV');
291 if (Array.isArray(data)) {
292 new_data = JSON.parse(JSON.stringify(current_analysis_data));
293 JSON_delta.patch(new_data, data);
298 var minimum_version = xhr.getResponseHeader('X-RGMV');
299 if (minimum_version && minimum_version > SCRIPT_VERSION) {
300 // Upgrade to latest version with a force-reload.
301 location.reload(true);
304 // Verify that the PV makes sense.
306 if (new_data['pv']) {
307 var hiddenboard = new Chess(new_data['position']['fen']);
308 for (var i = 0; i < new_data['pv'].length; ++i) {
309 if (hiddenboard.move(new_data['pv'][i]) === null) {
317 possibly_play_sound(current_analysis_data, new_data);
318 current_analysis_data = new_data;
320 update_num_viewers(num_viewers);
322 console.log("Received invalid update, waiting five seconds and trying again.");
323 setTimeout(function() { location.reload(true); }, 5000);
327 var possibly_play_sound = function(old_data, new_data) {
331 if (old_data === null) {
334 var ding = document.getElementById('ding');
335 if (ding && ding.play) {
336 if (old_data['position'] && old_data['position']['fen'] &&
337 new_data['position'] && new_data['position']['fen'] &&
338 (old_data['position']['fen'] !== new_data['position']['fen'] ||
339 old_data['position']['move_num'] !== new_data['position']['move_num'])) {
346 * @type {!string} server_date_string
348 var sync_server_clock = function(server_date_string) {
349 var server_time_ms = new Date(server_date_string).getTime();
350 var client_time_ms = new Date().getTime();
351 var estimated_offset_ms = server_time_ms - client_time_ms;
353 // In order not to let the noise move us too much back and forth
354 // (the server only has one-second resolution anyway), we only
355 // change an existing skew if we are at least five seconds off.
356 if (client_clock_offset_ms === null ||
357 Math.abs(estimated_offset_ms - client_clock_offset_ms) > 5000) {
358 client_clock_offset_ms = estimated_offset_ms;
362 var clear_arrows = function() {
363 for (var i = 0; i < arrows.length; ++i) {
365 if (arrows[i].svg.parentElement) {
366 arrows[i].svg.parentElement.removeChild(arrows[i].svg);
368 delete arrows[i].svg;
373 occupied_by_arrows = [];
374 for (var y = 0; y < 8; ++y) {
375 occupied_by_arrows.push([false, false, false, false, false, false, false, false]);
379 var redraw_arrows = function() {
380 for (var i = 0; i < arrows.length; ++i) {
381 position_arrow(arrows[i]);
385 /** @param {!number} x
388 var sign = function(x) {
398 /** See if drawing this arrow on the board would cause unduly amount of confusion.
399 * @param {!string} from The square the arrow is from (e.g. e4).
400 * @param {!string} to The square the arrow is to (e.g. e4).
403 var interfering_arrow = function(from, to) {
404 var from_col = from.charCodeAt(0) - "a1".charCodeAt(0);
405 var from_row = from.charCodeAt(1) - "a1".charCodeAt(1);
406 var to_col = to.charCodeAt(0) - "a1".charCodeAt(0);
407 var to_row = to.charCodeAt(1) - "a1".charCodeAt(1);
409 occupied_by_arrows[from_row][from_col] = true;
411 // Knight move: Just check that we haven't been at the destination before.
412 if ((Math.abs(to_col - from_col) == 2 && Math.abs(to_row - from_row) == 1) ||
413 (Math.abs(to_col - from_col) == 1 && Math.abs(to_row - from_row) == 2)) {
414 return occupied_by_arrows[to_row][to_col];
417 // Sliding piece: Check if anything except the from-square is seen before.
418 var dx = sign(to_col - from_col);
419 var dy = sign(to_row - from_row);
425 if (occupied_by_arrows[y][x]) {
428 occupied_by_arrows[y][x] = true;
429 } while (x != to_col || y != to_row);
434 /** Find a point along the coordinate system given by the given line,
435 * <t> units forward from the start of the line, <u> units to the right of it.
436 * @param {!number} x1
437 * @param {!number} x2
438 * @param {!number} y1
439 * @param {!number} y2
442 * @return {!string} The point in "x y" form, suitable for SVG paths.
444 var point_from_start = function(x1, y1, x2, y2, t, u) {
448 var norm = 1.0 / Math.sqrt(dx * dx + dy * dy);
452 var x = x1 + dx * t + dy * u;
453 var y = y1 + dy * t - dx * u;
457 /** Find a point along the coordinate system given by the given line,
458 * <t> units forward from the end of the line, <u> units to the right of it.
459 * @param {!number} x1
460 * @param {!number} x2
461 * @param {!number} y1
462 * @param {!number} y2
465 * @return {!string} The point in "x y" form, suitable for SVG paths.
467 var point_from_end = function(x1, y1, x2, y2, t, u) {
471 var norm = 1.0 / Math.sqrt(dx * dx + dy * dy);
475 var x = x2 + dx * t + dy * u;
476 var y = y2 + dy * t - dx * u;
480 var position_arrow = function(arrow) {
482 if (arrow.svg.parentElement) {
483 arrow.svg.parentElement.removeChild(arrow.svg);
487 if (current_display_line !== null && !current_display_line_is_history) {
491 var zoom_factor = $("#board").width() / 400.0;
492 var line_width = arrow.line_width * zoom_factor;
493 var arrow_size = arrow.arrow_size * zoom_factor;
495 var square_width = $(".square-a8").width();
496 var pos, from_y, to_y, from_x, to_x;
497 if (board.orientation() === 'black') {
498 pos = $(".square-h1").position();
499 from_y = (arrow.from_row + 0.5)*square_width;
500 to_y = (arrow.to_row + 0.5)*square_width;
501 from_x = (7 - arrow.from_col + 0.5)*square_width;
502 to_x = (7 - arrow.to_col + 0.5)*square_width;
504 pos = $(".square-a8").position();
505 from_y = (7 - arrow.from_row + 0.5)*square_width;
506 to_y = (7 - arrow.to_row + 0.5)*square_width;
507 from_x = (arrow.from_col + 0.5)*square_width;
508 to_x = (arrow.to_col + 0.5)*square_width;
511 var SVG_NS = "http://www.w3.org/2000/svg";
512 var XHTML_NS = "http://www.w3.org/1999/xhtml";
513 var svg = document.createElementNS(SVG_NS, "svg");
514 svg.setAttribute("width", /** @type{number} */ ($("#board").width()));
515 svg.setAttribute("height", /** @type{number} */ ($("#board").height()));
516 svg.setAttribute("style", "position: absolute");
517 svg.setAttribute("position", "absolute");
518 svg.setAttribute("version", "1.1");
519 svg.setAttribute("class", "c1");
520 svg.setAttribute("xmlns", XHTML_NS);
528 var outline = document.createElementNS(SVG_NS, "path");
529 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));
530 outline.setAttribute("xmlns", XHTML_NS);
531 outline.setAttribute("stroke", "#666");
532 outline.setAttribute("stroke-width", line_width + 2);
533 outline.setAttribute("fill", "none");
534 svg.appendChild(outline);
536 var path = document.createElementNS(SVG_NS, "path");
537 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));
538 path.setAttribute("xmlns", XHTML_NS);
539 path.setAttribute("stroke", arrow.fg_color);
540 path.setAttribute("stroke-width", line_width);
541 path.setAttribute("fill", "none");
542 svg.appendChild(path);
544 // Then the arrow head.
545 var head = document.createElementNS(SVG_NS, "path");
546 head.setAttribute("d",
547 "M " + point_from_end(x1, y1, x2, y2, 0, 0) +
548 " L " + point_from_end(x1, y1, x2, y2, -arrow_size, -arrow_size / 2) +
549 " L " + point_from_end(x1, y1, x2, y2, -arrow_size * .623, 0.0) +
550 " L " + point_from_end(x1, y1, x2, y2, -arrow_size, arrow_size / 2) +
551 " L " + point_from_end(x1, y1, x2, y2, 0, 0));
552 head.setAttribute("xmlns", XHTML_NS);
553 head.setAttribute("stroke", "#000");
554 head.setAttribute("stroke-width", "1");
555 head.setAttribute("fill", arrow.fg_color);
556 svg.appendChild(head);
558 $(svg).css({ top: pos.top, left: pos.left, 'pointer-events': 'none' });
559 document.body.appendChild(svg);
564 * @param {!string} from_square
565 * @param {!string} to_square
566 * @param {!string} fg_color
567 * @param {number} line_width
568 * @param {number} arrow_size
570 var create_arrow = function(from_square, to_square, fg_color, line_width, arrow_size) {
571 var from_col = from_square.charCodeAt(0) - "a1".charCodeAt(0);
572 var from_row = from_square.charCodeAt(1) - "a1".charCodeAt(1);
573 var to_col = to_square.charCodeAt(0) - "a1".charCodeAt(0);
574 var to_row = to_square.charCodeAt(1) - "a1".charCodeAt(1);
582 line_width: line_width,
583 arrow_size: arrow_size,
587 position_arrow(arrow);
591 var compare_by_score = function(refutation_lines, invert, a, b) {
592 var sa = compute_score_sort_key(refutation_lines[b]['score'], refutation_lines[b]['depth'], invert);
593 var sb = compute_score_sort_key(refutation_lines[a]['score'], refutation_lines[a]['depth'], invert);
598 * Fake multi-PV using the refutation lines. Find all “relevant” moves,
599 * sorted by quality, descending.
601 * @param {!Object} data
602 * @param {number} margin The maximum number of centipawns worse than the
603 * best move can be and still be included.
604 * @param {boolean} invert Whether black is to play.
605 * @return {Array.<string>} The FEN representation (e.g. Ne4) of all
606 * moves, in score order.
608 var find_nonstupid_moves = function(data, margin, invert) {
609 // First of all, if there are any moves that are more than 0.5 ahead of
610 // the primary move, the refutation lines are probably bunk, so just
612 var best_score = undefined;
613 var pv_score = undefined;
614 for (var move in data['refutation_lines']) {
615 var line = data['refutation_lines'][move];
616 var score = compute_score_sort_key(line['score'], line['depth'], invert, false);
617 if (move == data['pv'][0]) {
620 if (best_score === undefined || score > best_score) {
623 if (line['depth'] < 8) {
628 if (best_score - pv_score > 50) {
632 // Now find all moves that are within “margin” of the best score.
633 // The PV move will always be first.
635 for (var move in data['refutation_lines']) {
636 var line = data['refutation_lines'][move];
637 var score = compute_score_sort_key(line['score'], line['depth'], invert);
638 if (move != data['pv'][0] && best_score - score <= margin) {
642 moves = moves.sort(function(a, b) { return compare_by_score(data['refutation_lines'], data['position']['toplay'] === 'B', a, b) });
643 moves.unshift(data['pv'][0]);
652 var thousands = function(x) {
653 return String(x).split('').reverse().join('').replace(/(\d{3}\B)/g, '$1,').split('').reverse().join('');
657 * @param {!string} start_fen
658 * @param {Array.<string>} pv
659 * @param {number} move_num
660 * @param {!string} toplay
661 * @param {Array<{ first_move: integer, score: Object }>} scores
662 * @param {number} start_display_move_num
663 * @param {number=} opt_limit
664 * @param {boolean=} opt_showlast
666 var add_pv = function(start_fen, pv, move_num, toplay, scores, start_display_move_num, opt_limit, opt_showlast) {
668 start_fen: start_fen,
670 move_num: parseInt(move_num),
673 start_display_move_num: start_display_move_num
675 var splicepos = null;
676 if (scores !== null && scores.length >= 1 &&
677 scores[scores.length - 1].score !== undefined &&
678 scores[scores.length - 1].score !== null &&
679 (scores[scores.length - 1].score[0] === 'T' ||
680 scores[scores.length - 1].score[0] === 't')) {
681 splicepos = scores[scores.length - 1].score[1];
683 return print_pv(display_lines.length - 1, splicepos, opt_limit, opt_showlast);
687 * @param {number} line_num
688 * @param {?number} splicepos If non-null, where the tablebase-spliced portion of the TB starts.
689 * @param {number=} opt_limit If set, show at most this number of moves.
690 * @param {boolean=} opt_showlast If limit is set, show the last moves instead of the first ones.
692 var print_pv = function(line_num, splicepos, opt_limit, opt_showlast) {
693 var display_line = display_lines[line_num];
694 var pv = display_line.pv;
695 var move_num = display_line.move_num;
696 var toplay = display_line.toplay;
698 // Truncate PV at the start if needed.
699 var start_display_move_num = display_line.start_display_move_num;
700 if (start_display_move_num > 0) {
701 pv = pv.slice(start_display_move_num);
702 var to_add = start_display_move_num;
703 if (toplay === 'B') {
708 if (to_add % 2 == 1) {
712 move_num += to_add / 2;
713 if (splicepos !== null && splicepos > 0) {
721 if (opt_limit && opt_showlast && pv.length > opt_limit) {
722 // Truncate the PV at the beginning (instead of at the end).
723 // We assume here that toplay is 'W'. We also assume that if
724 // opt_showlast is set, then it is the history, and thus,
725 // the UI should be to expand the history.
726 ret = '(<a class="move" href="javascript:collapse_history(false)">…</a>) ';
727 i = pv.length - opt_limit;
732 } else if (toplay == 'B' && pv.length > 0) {
734 if (splicepos === 0) {
738 move += "<a class=\"move\" id=\"automove" + line_num + "-0\" href=\"javascript:show_line(" + line_num + ", " + 0 + ");\">" + pv[0] + "</a>";
739 ret = move_num + '. … ' + move;
744 for ( ; i < pv.length; ++i) {
745 var move = "<a class=\"move\" id=\"automove" + line_num + "-" + i + "\" href=\"javascript:show_line(" + line_num + ", " + i + ");\">" + pv[i] + "</a>";
746 if (splicepos === i) {
752 if (i > opt_limit && !opt_showlast) {
761 ret += move_num + '. ' + move;
775 /** Update the highlighted to/from squares on the board.
776 * Based on the global "highlight_from" and "highlight_to" variables.
778 var update_board_highlight = function() {
779 $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
780 if ((current_display_line === null || current_display_line_is_history) &&
781 highlight_from !== undefined && highlight_to !== undefined) {
782 $("#board").find('.square-' + highlight_from).addClass('nonuglyhighlight');
783 $("#board").find('.square-' + highlight_to).addClass('nonuglyhighlight');
787 var update_history = function() {
788 if (display_lines[0] === null || display_lines[0].pv.length == 0) {
789 $("#history").html("No history");
790 } else if (truncate_display_history) {
791 $("#history").html(print_pv(0, null, 8, true));
794 '(<a class="move" href="javascript:collapse_history(true)">collapse</a>) ' +
800 * @param {!boolean} truncate_history
802 var collapse_history = function(truncate_history) {
803 truncate_display_history = truncate_history;
806 window['collapse_history'] = collapse_history;
808 /** Update the HTML display of multi-PV from the global "refutation_lines".
810 * Also recreates the global "display_lines".
812 var update_refutation_lines = function() {
813 if (base_fen === null) {
816 if (display_lines.length > 2) {
817 // Truncate so that only the history and PV is left.
818 display_lines = [ display_lines[0], display_lines[1] ];
820 var tbl = $("#refutationlines");
823 if (display_lines.length < 2) {
827 // Find out where the lines start from.
829 var base_scores = display_lines[1].scores;
830 var start_display_move_num = 0;
831 if (hash_refutation_lines) {
832 base_line = current_display_line.pv.slice(0, current_display_move + 1);
833 base_scores = current_display_line.scores;
834 start_display_move_num = base_line.length;
838 for (var move in refutation_lines) {
842 var invert = (toplay === 'B');
843 if (current_display_line && current_display_move % 2 == 0 && !current_display_line_is_history) {
846 moves = moves.sort(function(a, b) { return compare_by_score(refutation_lines, invert, a, b) });
847 for (var i = 0; i < moves.length; ++i) {
848 var line = refutation_lines[moves[i]];
850 var tr = document.createElement("tr");
852 var move_td = document.createElement("td");
853 tr.appendChild(move_td);
854 $(move_td).addClass("move");
856 var scores = base_scores.concat([{ first_move: start_display_move_num, score: line['score'] }]);
858 if (line['pv'].length == 0) {
859 // Not found, so just make a one-move PV.
860 var move = "<a class=\"move\" href=\"javascript:show_line(" + display_lines.length + ", " + 0 + ");\">" + line['move'] + "</a>";
861 $(move_td).html(move);
862 var score_td = document.createElement("td");
864 $(score_td).addClass("score");
865 $(score_td).text("—");
866 tr.appendChild(score_td);
868 var depth_td = document.createElement("td");
869 tr.appendChild(depth_td);
870 $(depth_td).addClass("depth");
871 $(depth_td).text("—");
873 var pv_td = document.createElement("td");
874 tr.appendChild(pv_td);
875 $(pv_td).addClass("pv");
876 $(pv_td).html(add_pv(base_fen, base_line.concat([ line['move'] ]), move_num, toplay, scores, start_display_move_num));
882 var move = "<a class=\"move\" href=\"javascript:show_line(" + display_lines.length + ", " + 0 + ");\">" + line['move'] + "</a>";
883 $(move_td).html(move);
885 var score_td = document.createElement("td");
886 tr.appendChild(score_td);
887 $(score_td).addClass("score");
888 $(score_td).text(format_short_score(line['score']));
890 var depth_td = document.createElement("td");
891 tr.appendChild(depth_td);
892 $(depth_td).addClass("depth");
893 if (line['depth'] && line['depth'] >= 0) {
894 $(depth_td).text("d" + line['depth']);
896 $(depth_td).text("—");
899 var pv_td = document.createElement("td");
900 tr.appendChild(pv_td);
901 $(pv_td).addClass("pv");
902 $(pv_td).html(add_pv(base_fen, base_line.concat(line['pv']), move_num, toplay, scores, start_display_move_num, 10));
907 // Update the move highlight, as we've rewritten all the HTML.
908 update_move_highlight();
912 * Create a Chess.js board object, containing the given position plus the given moves,
913 * up to the given limit.
915 * @param {?string} fen
916 * @param {Array.<string>} moves
917 * @param {number} last_move
919 var chess_from = function(fen, moves, last_move) {
920 var hiddenboard = new Chess();
921 if (fen !== null && fen !== undefined) {
922 hiddenboard.load(fen);
924 for (var i = 0; i <= last_move; ++i) {
925 if (moves[i] === '0-0') {
926 hiddenboard.move('O-O');
927 } else if (moves[i] === '0-0-0') {
928 hiddenboard.move('O-O-O');
930 hiddenboard.move(moves[i]);
936 var update_game_list = function(games) {
937 $("#games").text("");
938 if (games === null) {
942 var games_div = document.getElementById('games');
943 for (var game_num = 0; game_num < games.length; ++game_num) {
944 var game = games[game_num];
945 var game_span = document.createElement("span");
946 game_span.setAttribute("class", "game");
948 var game_name = document.createTextNode(game['name']);
949 if (game['url'] === backend_url) {
951 game_span.appendChild(game_name);
953 if (current_analysis_data && current_analysis_data['position']) {
955 if (current_analysis_data['position']['result']) {
956 score = " (" + current_analysis_data['position']['result'] + ")";
958 score = " (" + format_short_score(current_analysis_data['score']) + ")";
960 game_span.appendChild(document.createTextNode(score));
964 var game_a = document.createElement("a");
965 game_a.setAttribute("href", "#" + game['id']);
966 game_a.appendChild(game_name);
967 game_span.appendChild(game_a);
970 if (game['result']) {
971 score = " (" + game['result'] + ")";
973 score = " (" + format_short_score(game['score']) + ")";
975 game_span.appendChild(document.createTextNode(score));
978 games_div.appendChild(game_span);
983 * Try to find a running game that matches with the current hash,
984 * and switch to it if we're not already displaying it.
986 var possibly_switch_game_from_hash = function() {
987 var history_match = window.location.hash.match(/^#history=([a-zA-Z0-9_-]+)/);
988 if (history_match !== null) {
989 var game_id = history_match[1];
991 url: '/history/' + game_id + '.json',
993 id: 'history=' + game_id
995 switch_backend(fake_game);
999 if (current_games === null) {
1003 var hash = window.location.hash.replace(/^#/,'');
1004 for (var i = 0; i < current_games.length; ++i) {
1005 if (current_games[i]['id'] === hash) {
1006 if (backend_url !== current_games[i]['url']) {
1007 switch_backend(current_games[i]);
1015 * If this is a Chess960 castling which doesn't move the king,
1016 * move the rook instead.
1018 var patch_move = function(move) {
1019 if (move === null) return null;
1020 if (move.from !== move.to) return move;
1022 var f = move.rook_sq & 15;
1023 var r = move.rook_sq >> 4;
1024 var from = ('abcdefgh'.substring(f,f+1) + '87654321'.substring(r,r+1));
1027 if (move.to === 'g1') {
1029 } else if (move.to === 'g8') {
1031 } else if (move.to === 'b1') {
1033 } else if (move.to === 'b8') {
1037 return { from: from, to: to };
1040 /** Update all the HTML on the page, based on current global state.
1042 var update_board = function() {
1043 document.body.style.opacity = null;
1045 var data = displayed_analysis_data || current_analysis_data;
1046 var current_data = current_analysis_data; // Convenience alias.
1050 // Print the history. This is pretty much the only thing that's
1051 // unconditionally taken from current_data (we're not interested in
1052 // historic history).
1053 if (current_data['position']['history']) {
1054 var start = (current_data['position'] && current_data['position']['start_fen']) ? current_data['position']['start_fen'] : 'start';
1055 add_pv(start, current_data['position']['history'], 1, 'W', null, 0, 8, true);
1057 display_lines.push(null);
1061 // Games currently in progress, if any.
1062 if (current_data['games']) {
1063 current_games = current_data['games'];
1064 possibly_switch_game_from_hash();
1066 current_games = null;
1068 update_game_list(current_games);
1070 // The headline. Names are always fetched from current_data;
1071 // the rest can depend a bit.
1074 current_data['position']['player_w'] && current_data['position']['player_b']) {
1075 headline = current_data['position']['player_w'] + '–' +
1076 current_data['position']['player_b'] + ', analysis';
1078 headline = 'Analysis';
1081 // Credits, where applicable. Note that we don't want the footer to change a lot
1082 // when e.g. viewing history, so if any of these changed during the game,
1083 // use the current one still.
1084 if (current_data['using_lomonosov']) {
1085 $("#lomonosov").show();
1087 $("#lomonosov").hide();
1090 // Credits: The engine name/version.
1091 if (current_data['engine'] && current_data['engine']['name'] !== null) {
1092 $("#engineid").text(current_data['engine']['name']);
1095 // Credits: The engine URL.
1096 if (current_data['engine'] && current_data['engine']['url']) {
1097 $("#engineid").attr("href", current_data['engine']['url']);
1099 $("#engineid").removeAttr("href");
1102 // Credits: Engine details.
1103 if (current_data['engine'] && current_data['engine']['details']) {
1104 $("#enginedetails").text(" (" + current_data['engine']['details'] + ")");
1106 $("#enginedetails").text("");
1109 // Credits: Move source, possibly with URL.
1110 if (current_data['move_source'] && current_data['move_source_url']) {
1111 $("#movesource").text("Moves provided by ");
1112 var movesource_a = document.createElement("a");
1113 movesource_a.setAttribute("href", current_data['move_source_url']);
1114 var movesource_text = document.createTextNode(current_data['move_source']);
1115 movesource_a.appendChild(movesource_text);
1116 var movesource_period = document.createTextNode(".");
1117 document.getElementById("movesource").appendChild(movesource_a);
1118 document.getElementById("movesource").appendChild(movesource_period);
1119 } else if (current_data['move_source']) {
1120 $("#movesource").text("Moves provided by " + current_data['move_source'] + ".");
1122 $("#movesource").text("");
1126 if (displayed_analysis_data) {
1127 // Displaying some non-current position, pick out the last move
1128 // from the history. This will work even if the fetch failed.
1129 if (current_display_move !== -1) {
1130 last_move = format_halfmove_with_number(
1131 current_display_line.pv[current_display_move],
1132 current_display_move);
1133 headline += ' after ' + last_move;
1135 } else if (data['position']['last_move'] !== 'none') {
1136 // Find the previous move.
1137 var previous_move_num, previous_toplay;
1138 if (data['position']['toplay'] == 'B') {
1139 previous_move_num = data['position']['move_num'];
1140 previous_toplay = 'W';
1142 previous_move_num = data['position']['move_num'] - 1;
1143 previous_toplay = 'B';
1146 last_move = format_move_with_number(
1147 data['position']['last_move'],
1149 previous_toplay == 'W');
1150 headline += ' after ' + last_move;
1154 $("#headline").text(headline);
1156 // The <title> contains a very brief headline.
1157 var title_elems = [];
1158 if (data['position'] && data['position']['result']) {
1159 title_elems.push(data['position']['result']);
1160 } else if (data['score']) {
1161 title_elems.push(format_short_score(data['score']));
1163 if (last_move !== null) {
1164 title_elems.push(last_move);
1167 if (title_elems.length != 0) {
1168 document.title = '(' + title_elems.join(', ') + ') analysis.sesse.net';
1170 document.title = 'analysis.sesse.net';
1173 // The last move (shown by highlighting the from and to squares).
1174 if (data['position'] && data['position']['last_move_uci']) {
1175 highlight_from = data['position']['last_move_uci'].substr(0, 2);
1176 highlight_to = data['position']['last_move_uci'].substr(2, 2);
1177 } else if (current_display_line_is_history && current_display_line && current_display_move >= 0) {
1178 // We don't have historic analysis for this position, but we
1179 // can reconstruct what the last move was by just replaying
1181 var position = (data['position'] && data['position']['start_fen']) ? data['position']['start_fen'] : null;
1182 var hiddenboard = chess_from(position, current_display_line.pv, current_display_move);
1183 var moves = hiddenboard.history({ verbose: true });
1184 last_move = moves.pop();
1185 highlight_from = last_move.from;
1186 highlight_to = last_move.to;
1188 highlight_from = highlight_to = undefined;
1190 update_board_highlight();
1192 if (data['failed']) {
1193 $("#score").text("No analysis for this move");
1194 $("#pvtitle").text("PV:");
1196 $("#searchstats").html(" ");
1197 $("#refutationlines").empty();
1198 $("#whiteclock").empty();
1199 $("#blackclock").empty();
1200 refutation_lines = [];
1201 update_refutation_lines();
1203 update_displayed_line();
1204 update_move_highlight();
1211 if (current_display_line && !current_display_line_is_history) {
1213 if (current_display_line.scores && current_display_line.scores.length > 0) {
1214 for (var i = 0; i < current_display_line.scores.length; ++i) {
1215 if (current_display_move < current_display_line.scores[i].first_move) {
1218 score = current_display_line.scores[i].score;
1222 $("#score").text(format_long_score(score));
1224 $("#score").text("No score for this line");
1226 } else if (data['score']) {
1227 $("#score").text(format_long_score(data['score']));
1230 // The search stats.
1231 if (data['searchstats']) {
1232 $("#searchstats").html(data['searchstats']);
1233 } else if (data['tablebase'] == 1) {
1234 $("#searchstats").text("Tablebase result");
1235 } else if (data['nodes'] && data['nps'] && data['depth']) {
1236 var stats = thousands(data['nodes']) + ' nodes, ' + thousands(data['nps']) + ' nodes/sec, depth ' + data['depth'] + ' ply';
1237 if (data['seldepth']) {
1238 stats += ' (' + data['seldepth'] + ' selective)';
1240 if (data['tbhits'] && data['tbhits'] > 0) {
1241 if (data['tbhits'] == 1) {
1242 stats += ', one Syzygy hit';
1244 stats += ', ' + thousands(data['tbhits']) + ' Syzygy hits';
1248 $("#searchstats").text(stats);
1250 $("#searchstats").text("");
1253 // Update the board itself.
1254 base_fen = data['position']['fen'];
1255 update_displayed_line();
1258 $("#pvtitle").text("PV:");
1260 var scores = [{ first_move: -1, score: data['score'] }];
1261 $("#pv").html(add_pv(data['position']['fen'], data['pv'], data['position']['move_num'], data['position']['toplay'], scores, 0));
1263 // Update the PV arrow.
1265 if (data['pv'].length >= 1) {
1266 var hiddenboard = new Chess(base_fen);
1268 // draw a continuation arrow as long as it's the same piece
1270 for (var i = 0; i < data['pv'].length; i += 2) {
1271 var move = patch_move(hiddenboard.move(data['pv'][i]));
1273 if ((i >= 2 && move.from != last_to) ||
1274 interfering_arrow(move.from, move.to)) {
1277 create_arrow(move.from, move.to, '#f66', 6, 20);
1279 hiddenboard.move(data['pv'][i + 1]); // To keep continuity.
1282 var alt_moves = find_nonstupid_moves(data, 30, data['position']['toplay'] === 'B');
1283 for (var i = 1; i < alt_moves.length && i < 3; ++i) {
1284 hiddenboard = new Chess(base_fen);
1285 var move = patch_move(hiddenboard.move(alt_moves[i]));
1286 if (move !== null) {
1287 create_arrow(move.from, move.to, '#f66', 1, 10);
1292 // See if all semi-reasonable moves have only one possible response.
1293 if (data['pv'].length >= 2) {
1294 var nonstupid_moves = find_nonstupid_moves(data, 300, data['position']['toplay'] === 'B');
1297 var hiddenboard = new Chess(base_fen);
1298 hiddenboard.move(data['pv'][0]);
1299 response = hiddenboard.move(data['pv'][1]);
1301 for (var i = 0; i < nonstupid_moves.length; ++i) {
1302 if (nonstupid_moves[i] == data['pv'][0]) {
1303 // ignore the PV move for refutation lines.
1306 if (!data['refutation_lines'] ||
1307 !data['refutation_lines'][nonstupid_moves[i]] ||
1308 !data['refutation_lines'][nonstupid_moves[i]]['pv'] ||
1309 data['refutation_lines'][nonstupid_moves[i]]['pv'].length < 2) {
1310 // Incomplete PV, abort.
1311 response = undefined;
1314 var line = data['refutation_lines'][nonstupid_moves[i]];
1315 hiddenboard = new Chess(base_fen);
1316 hiddenboard.move(line['pv'][0]);
1317 var this_response = hiddenboard.move(line['pv'][1]);
1318 if (this_response === null) {
1319 console.log("BUG: ", i);
1321 console.log(line['pv']);
1323 if (response.from !== this_response.from || response.to !== this_response.to) {
1324 // Different response depending on lines, abort.
1325 response = undefined;
1330 if (nonstupid_moves.length > 0 && response !== undefined) {
1331 create_arrow(response.from, response.to, '#66f', 6, 20);
1335 // Update the refutation lines.
1336 base_fen = data['position']['fen'];
1337 move_num = parseInt(data['position']['move_num']);
1338 toplay = data['position']['toplay'];
1339 refutation_lines = hash_refutation_lines || data['refutation_lines'];
1340 update_refutation_lines();
1342 // Update the sparkline last, since its size depends on how everything else reflowed.
1343 update_sparkline(data);
1346 var update_sparkline = function(data) {
1347 if (data && data['score_history']) {
1348 var first_move_num = undefined;
1349 for (var halfmove_num in data['score_history']) {
1350 halfmove_num = parseInt(halfmove_num);
1351 if (first_move_num === undefined || halfmove_num < first_move_num) {
1352 first_move_num = halfmove_num;
1355 if (first_move_num !== undefined) {
1356 var last_move_num = data['position']['move_num'] * 2 - 3;
1357 if (data['position']['toplay'] === 'B') {
1361 // Possibly truncate some moves if we don't have enough width.
1362 // FIXME: Sometimes width() for #scorecontainer (and by extent,
1363 // #scoresparkcontainer) on Chrome for mobile seems to start off
1364 // at something very small, and then suddenly snap back into place.
1366 var max_moves = Math.floor($("#scoresparkcontainer").width() / 5) - 5;
1367 if (last_move_num - first_move_num > max_moves) {
1368 first_move_num = last_move_num - max_moves;
1371 var min_score = -100;
1372 var max_score = 100;
1373 var last_score = null;
1375 for (var halfmove_num = first_move_num; halfmove_num <= last_move_num; ++halfmove_num) {
1376 if (data['score_history'][halfmove_num]) {
1377 var score = compute_plot_score(data['score_history'][halfmove_num]);
1379 if (score < min_score) min_score = score;
1380 if (score > max_score) max_score = score;
1382 scores.push(last_score);
1384 if (data['score']) {
1385 scores.push(compute_plot_score(data['score']));
1387 // FIXME: at some widths, calling sparkline() seems to push
1388 // #scorecontainer under the board.
1389 $('#scorespark').unbind('sparklineClick');
1390 $("#scorespark").sparkline(scores, {
1393 chartRangeMin: min_score,
1394 chartRangeMax: max_score,
1395 tooltipFormatter: function(sparkline, options, fields) {
1396 // score_history contains the Nth _position_, but format_tooltip
1397 // wants to format the Nth _move_; thus the -1.
1398 return format_tooltip(data, fields[0].offset + first_move_num - 1);
1401 $('#scorespark').unbind('sparklineClick');
1402 $('#scorespark').bind('sparklineClick', function(event) {
1403 var sparkline = event.sparklines[0];
1404 var region = sparkline.getCurrentRegionFields();
1405 if (region[0].offset !== undefined) {
1406 show_line(0, first_move_num + region[0].offset - 1);
1410 $("#scorespark").text("");
1413 $("#scorespark").text("");
1418 * @param {number} num_viewers
1420 var update_num_viewers = function(num_viewers) {
1422 if (num_viewers === null) {
1424 } else if (num_viewers == 1) {
1425 text = "You are the only current viewer";
1427 text = num_viewers + " current viewers";
1429 if (display_fen !== null) {
1430 var counter = Math.floor(display_fen.split(" ")[4] / 2);
1431 if (counter >= 20) {
1432 text = text.replace("current ", "");
1433 text += " | 50-move rule: " + counter;
1436 $("#numviewers").text(text);
1439 var update_clock = function() {
1440 clearTimeout(clock_timer);
1442 var data = displayed_analysis_data || current_analysis_data;
1445 if (data['position']) {
1446 var result = data['position']['result'];
1447 if (result === '1-0') {
1448 $("#whiteclock").text("1");
1449 $("#blackclock").text("0");
1450 $("#whiteclock").removeClass("running-clock");
1451 $("#blackclock").removeClass("running-clock");
1454 if (result === '1/2-1/2') {
1455 $("#whiteclock").text("1/2");
1456 $("#blackclock").text("1/2");
1457 $("#whiteclock").removeClass("running-clock");
1458 $("#blackclock").removeClass("running-clock");
1461 if (result === '0-1') {
1462 $("#whiteclock").text("0");
1463 $("#blackclock").text("1");
1464 $("#whiteclock").removeClass("running-clock");
1465 $("#blackclock").removeClass("running-clock");
1470 var white_clock_ms = null;
1471 var black_clock_ms = null;
1474 if (data['position'] &&
1475 data['position']['white_clock'] &&
1476 data['position']['black_clock']) {
1477 white_clock_ms = data['position']['white_clock'] * 1000;
1478 black_clock_ms = data['position']['black_clock'] * 1000;
1481 // Dynamic clock (only one, obviously).
1483 if (data['position']['white_clock_target']) {
1485 $("#whiteclock").addClass("running-clock");
1486 $("#blackclock").removeClass("running-clock");
1487 } else if (data['position']['black_clock_target']) {
1489 $("#whiteclock").removeClass("running-clock");
1490 $("#blackclock").addClass("running-clock");
1492 $("#whiteclock").removeClass("running-clock");
1493 $("#blackclock").removeClass("running-clock");
1497 var now = new Date().getTime() + client_clock_offset_ms;
1498 remaining_ms = data['position'][color + '_clock_target'] * 1000 - now;
1499 if (color === "white") {
1500 white_clock_ms = remaining_ms;
1502 black_clock_ms = remaining_ms;
1506 if (white_clock_ms === null || black_clock_ms === null) {
1507 $("#whiteclock").empty();
1508 $("#blackclock").empty();
1512 // If either player has twenty minutes or less left, add the second counters.
1513 // This matches what DGT clocks do.
1514 var show_seconds = (white_clock_ms < 60 * 20 * 1000 || black_clock_ms < 60 * 20 * 1000);
1517 // See when the clock will change next, and update right after that.
1520 next_update_ms = remaining_ms % 1000 + 100;
1522 next_update_ms = remaining_ms % 60000 + 100;
1524 clock_timer = setTimeout(update_clock, next_update_ms);
1527 $("#whiteclock").text(format_clock(white_clock_ms, show_seconds));
1528 $("#blackclock").text(format_clock(black_clock_ms, show_seconds));
1532 * @param {Number} remaining_ms
1533 * @param {boolean} show_seconds
1535 var format_clock = function(remaining_ms, show_seconds) {
1536 if (remaining_ms <= 0) {
1544 var remaining = Math.floor(remaining_ms / 1000);
1545 var seconds = remaining % 60;
1546 remaining = (remaining - seconds) / 60;
1547 var minutes = remaining % 60;
1548 remaining = (remaining - minutes) / 60;
1549 var hours = remaining;
1551 return format_2d(hours) + ":" + format_2d(minutes) + ":" + format_2d(seconds);
1553 return format_2d(hours) + ":" + format_2d(minutes);
1560 var format_2d = function(x) {
1569 * @param {string} move
1570 * @param {Number} move_num Move number of this move.
1571 * @param {boolean} white_to_play Whether white is to play this move.
1573 var format_move_with_number = function(move, move_num, white_to_play) {
1575 if (white_to_play) {
1576 ret = move_num + '. ';
1578 ret = move_num + '… ';
1585 * @param {string} move
1586 * @param {Number} halfmove_num Half-move number that is to be played,
1589 var format_halfmove_with_number = function(move, halfmove_num) {
1590 return format_move_with_number(
1592 Math.floor(halfmove_num / 2) + 1,
1593 halfmove_num % 2 == 0);
1597 * @param {Object} data
1598 * @param {Number} halfmove_num
1600 var format_tooltip = function(data, halfmove_num) {
1601 if (data['score_history'][halfmove_num + 1] ||
1602 (halfmove_num + 1) === data['position']['history'].length) {
1603 // Position is in the history, or it is the current position
1604 // (which is implicitly tacked onto the history).
1607 if ((halfmove_num + 1) === data['position']['history'].length) {
1608 move = data['position']['last_move'];
1609 short_score = format_short_score(data['score']);
1611 move = data['position']['history'][halfmove_num];
1612 short_score = format_short_score(data['score_history'][halfmove_num + 1]);
1614 if (halfmove_num === -1) {
1615 return "Start position: " + short_score;
1617 var move_with_number = format_halfmove_with_number(move, halfmove_num);
1618 return "After " + move_with_number + ": " + short_score;
1621 for (var i = halfmove_num; i --> -1; ) {
1622 if (data['score_history'][i]) {
1623 var move = data['position']['history'][i];
1625 return "[Analysis kept from start position]";
1627 return "[Analysis kept from " + format_halfmove_with_number(move, i) + "]";
1635 * @param {boolean} truncate_history
1637 var set_truncate_history = function(truncate_history) {
1638 truncate_display_history = truncate_history;
1639 update_refutation_lines();
1641 window['set_truncate_history'] = set_truncate_history;
1644 * @param {number} line_num
1645 * @param {number} move_num
1647 var show_line = function(line_num, move_num) {
1648 if (line_num == -1) {
1649 current_display_line = null;
1650 current_display_move = null;
1651 hash_refutation_lines = null;
1652 if (displayed_analysis_data) {
1653 // TODO: Support exiting to history position if we are in an
1654 // analysis line of a history position.
1655 displayed_analysis_data = null;
1660 current_display_line = jQuery.extend({}, display_lines[line_num]); // Shallow clone.
1661 current_display_move = move_num + current_display_line.start_display_move_num;
1663 current_display_line_is_history = (line_num == 0);
1665 update_historic_analysis();
1666 update_displayed_line();
1667 update_board_highlight();
1668 update_move_highlight();
1671 window['show_line'] = show_line;
1673 var prev_move = function() {
1674 if (current_display_line &&
1675 current_display_move >= current_display_line.start_display_move_num) {
1676 --current_display_move;
1678 update_historic_analysis();
1679 update_displayed_line();
1680 update_move_highlight();
1682 window['prev_move'] = prev_move;
1684 var next_move = function() {
1685 if (current_display_line &&
1686 current_display_move < current_display_line.pv.length - 1) {
1687 ++current_display_move;
1689 update_historic_analysis();
1690 update_displayed_line();
1691 update_move_highlight();
1693 window['next_move'] = next_move;
1695 var next_game = function() {
1696 if (current_games === null) {
1700 // Try to find the game we are currently looking at.
1701 for (var game_num = 0; game_num < current_games.length; ++game_num) {
1702 var game = current_games[game_num];
1703 if (game['url'] === backend_url) {
1704 var next_game_num = (game_num + 1) % current_games.length;
1705 switch_backend(current_games[next_game_num]);
1710 // Couldn't find it; give up.
1713 var update_historic_analysis = function() {
1714 if (!current_display_line_is_history) {
1717 if (current_display_move == current_display_line.pv.length - 1) {
1718 displayed_analysis_data = null;
1722 // Fetch old analysis for this line if it exists.
1723 var hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move);
1724 var filename = "/history/move" + (current_display_move + 1) + "-" +
1725 hiddenboard.fen().replace(/ /g, '_').replace(/\//g, '-') + ".json";
1727 current_historic_xhr = $.ajax({
1729 }).done(function(data, textstatus, xhr) {
1730 displayed_analysis_data = data;
1732 }).fail(function(jqXHR, textStatus, errorThrown) {
1733 if (textStatus === "abort") {
1734 // Aborted because we are switching backends. Don't do anything;
1735 // we will already have been cleared.
1737 displayed_analysis_data = {'failed': true};
1744 * @param {string} fen
1746 var update_imbalance = function(fen) {
1747 var hiddenboard = new Chess(fen);
1748 var imbalance = {'k': 0, 'q': 0, 'r': 0, 'b': 0, 'n': 0, 'p': 0};
1749 for (var row = 0; row < 8; ++row) {
1750 for (var col = 0; col < 8; ++col) {
1751 var col_text = String.fromCharCode('a1'.charCodeAt(0) + col);
1752 var row_text = String.fromCharCode('a1'.charCodeAt(1) + row);
1753 var square = col_text + row_text;
1754 var contents = hiddenboard.get(square);
1755 if (contents !== null) {
1756 if (contents.color === 'w') {
1757 ++imbalance[contents.type];
1759 --imbalance[contents.type];
1764 var white_imbalance = '';
1765 var black_imbalance = '';
1766 for (var piece in imbalance) {
1767 for (var i = 0; i < imbalance[piece]; ++i) {
1768 white_imbalance += '<img src="' + svg_pieces['w' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-piece">';
1769 white_imbalance += '<img src="' + svg_pieces['b' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-inverted-piece">';
1771 for (var i = 0; i < -imbalance[piece]; ++i) {
1772 black_imbalance += '<img src="' + svg_pieces['b' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-piece">';
1773 black_imbalance += '<img src="' + svg_pieces['w' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-inverted-piece">';
1776 $('#whiteimbalance').html(white_imbalance);
1777 $('#blackimbalance').html(black_imbalance);
1780 /** Mark the currently selected move in red.
1781 * Also replaces the PV with the current displayed line if it's not shown
1782 * anywhere else on the screen.
1784 var update_move_highlight = function() {
1785 if (highlighted_move !== null) {
1786 highlighted_move.removeClass('highlight');
1788 if (current_display_line) {
1789 var display_line_num = find_display_line_matching_num();
1790 if (display_line_num === null) {
1791 // Replace the PV with the (complete) line.
1792 $("#pvtitle").text("Exploring:");
1793 current_display_line.start_display_move_num = 0;
1794 display_lines.push(current_display_line);
1795 $("#pv").html(print_pv(display_lines.length - 1, null)); // FIXME
1796 display_line_num = display_lines.length - 1;
1798 // Clear out the PV, so it's not selected by anything later.
1799 display_lines[1].pv = [];
1802 highlighted_move = $("#automove" + display_line_num + "-" + (current_display_move - current_display_line.start_display_move_num));
1803 highlighted_move.addClass('highlight');
1808 * See if the current displayed line is identical to any of the ones
1809 * we have on screen. (It might not be if e.g. the analysis reloaded
1810 * since we started looking.)
1814 var find_display_line_matching_num = function() {
1815 for (var i = 0; i < display_lines.length; ++i) {
1816 var line = display_lines[i];
1817 if (line.start_display_move_num > 0) continue;
1818 if (current_display_line.start_fen !== line.start_fen) continue;
1819 if (current_display_line.pv.length !== line.pv.length) continue;
1821 for (var j = 0; j < line.pv.length; ++j) {
1822 if (current_display_line.pv[j] !== line.pv[j]) {
1834 /** Update the board based on the currently displayed line.
1836 * TODO: This should really be called only whenever something changes,
1837 * instead of all the time.
1839 var update_displayed_line = function() {
1840 if (current_display_line === null) {
1841 $("#linenav").hide();
1842 $("#linemsg").show();
1843 display_fen = base_fen;
1844 set_board_position(base_fen);
1845 update_imbalance(base_fen);
1849 $("#linenav").show();
1850 $("#linemsg").hide();
1852 if (current_display_move <= 0) {
1853 $("#prevmove").html("Previous");
1855 $("#prevmove").html("<a href=\"javascript:prev_move();\">Previous</a></span>");
1857 if (current_display_move == current_display_line.pv.length - 1) {
1858 $("#nextmove").html("Next");
1860 $("#nextmove").html("<a href=\"javascript:next_move();\">Next</a></span>");
1863 var hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move);
1864 set_board_position(hiddenboard.fen());
1865 if (display_fen !== hiddenboard.fen() && !current_display_line_is_history) {
1866 // Fire off a hash request, since we're now off the main position
1867 // and it just changed.
1868 explore_hash(hiddenboard.fen());
1870 display_fen = hiddenboard.fen();
1871 update_imbalance(hiddenboard.fen());
1874 var set_board_position = function(new_fen) {
1875 board_is_animating = true;
1876 var old_fen = board.fen();
1877 board.position(new_fen);
1878 if (board.fen() === old_fen) {
1879 board_is_animating = false;
1884 * @param {boolean} param_enable_sound
1886 var set_sound = function(param_enable_sound) {
1887 enable_sound = param_enable_sound;
1889 $("#soundon").html("<strong>On</strong>");
1890 $("#soundoff").html("<a href=\"javascript:set_sound(false)\">Off</a>");
1892 // Seemingly at least Firefox prefers MP3 over Opus; tell it otherwise,
1893 // and also preload the file since the user has selected audio.
1894 var ding = document.getElementById('ding');
1895 if (ding && ding.canPlayType && ding.canPlayType('audio/ogg; codecs="opus"') === 'probably') {
1896 ding.src = 'ding.opus';
1900 $("#soundon").html("<a href=\"javascript:set_sound(true)\">On</a>");
1901 $("#soundoff").html("<strong>Off</strong>");
1903 if (supports_html5_storage()) {
1904 localStorage['enable_sound'] = enable_sound ? 1 : 0;
1907 window['set_sound'] = set_sound;
1909 /** Send off a hash probe request to the backend.
1910 * @param {string} fen
1912 var explore_hash = function(fen) {
1913 // If we already have a backend response going, abort it.
1914 if (current_hash_xhr) {
1915 current_hash_xhr.abort();
1917 if (current_hash_display_timer) {
1918 clearTimeout(current_hash_display_timer);
1919 current_hash_display_timer = null;
1921 $("#refutationlines").empty();
1922 current_hash_xhr = $.ajax({
1923 url: backend_hash_url + "?fen=" + fen
1924 }).done(function(data, textstatus, xhr) {
1925 show_explore_hash_results(data, fen);
1929 /** Process the JSON response from a hash probe request.
1930 * @param {!Object} data
1931 * @param {string} fen
1933 var show_explore_hash_results = function(data, fen) {
1934 if (board_is_animating) {
1935 // Updating while the animation is still going causes
1936 // the animation to jerk. This is pretty crude, but it will do.
1937 current_hash_display_timer = setTimeout(function() { show_explore_hash_results(data, fen); }, 100);
1940 current_hash_display_timer = null;
1941 hash_refutation_lines = data['lines'];
1945 // almost all of this stuff comes from the chessboard.js example page
1946 var onDragStart = function(source, piece, position, orientation) {
1947 var pseudogame = new Chess(display_fen);
1948 if (pseudogame.game_over() === true ||
1949 (pseudogame.turn() === 'w' && piece.search(/^b/) !== -1) ||
1950 (pseudogame.turn() === 'b' && piece.search(/^w/) !== -1)) {
1954 recommended_move = get_best_move(pseudogame, source, null, pseudogame.turn() === 'b');
1955 if (recommended_move) {
1956 var squareEl = $('#board .square-' + recommended_move.to);
1957 squareEl.addClass('highlight1-32417');
1962 var mousedownSquare = function(e) {
1963 reverse_dragging_from = null;
1964 var square = $(this).attr('data-square');
1966 var pseudogame = new Chess(display_fen);
1967 if (pseudogame.game_over() === true) {
1971 // If the square is empty, or has a piece of the side not to move,
1972 // we handle it. If not, normal piece dragging will take it.
1973 var position = board.position();
1974 if (!position.hasOwnProperty(square) ||
1975 (pseudogame.turn() === 'w' && position[square].search(/^b/) !== -1) ||
1976 (pseudogame.turn() === 'b' && position[square].search(/^w/) !== -1)) {
1977 reverse_dragging_from = square;
1978 recommended_move = get_best_move(pseudogame, null, square, pseudogame.turn() === 'b');
1979 if (recommended_move) {
1980 var squareEl = $('#board .square-' + recommended_move.from);
1981 squareEl.addClass('highlight1-32417');
1982 squareEl = $('#board .square-' + recommended_move.to);
1983 squareEl.addClass('highlight1-32417');
1988 var mouseupSquare = function(e) {
1989 if (reverse_dragging_from === null) {
1992 var source = $(this).attr('data-square');
1993 var target = reverse_dragging_from;
1994 reverse_dragging_from = null;
1995 if (onDrop(source, target) !== 'snapback') {
1996 onSnapEnd(source, target);
1998 $("#board").find('.square-55d63').removeClass('highlight1-32417');
2001 var get_best_move = function(game, source, target, invert) {
2002 var moves = game.moves({ verbose: true });
2003 if (source !== null) {
2004 moves = moves.filter(function(move) { return move.from == source; });
2006 if (target !== null) {
2007 moves = moves.filter(function(move) { return move.to == target; });
2009 if (moves.length == 0) {
2012 if (moves.length == 1) {
2016 // More than one move. Use the display lines (if we have them)
2017 // to disambiguate; otherwise, we have no information.
2019 for (var i = 0; i < moves.length; ++i) {
2020 move_hash[moves[i].san] = moves[i];
2023 // See if we're already exploring some line.
2024 if (current_display_line &&
2025 current_display_move < current_display_line.pv.length - 1) {
2026 var first_move = current_display_line.pv[current_display_move + 1];
2027 if (move_hash[first_move]) {
2028 return move_hash[first_move];
2032 // History and PV take priority over the display lines.
2033 for (var i = 0; i < 2; ++i) {
2034 var line = display_lines[i];
2035 var first_move = line.pv[line.start_display_move_num];
2036 if (move_hash[first_move]) {
2037 return move_hash[first_move];
2041 var best_move = null;
2042 var best_move_score = null;
2044 for (var move in refutation_lines) {
2045 var line = refutation_lines[move];
2046 if (!line['score']) {
2049 var first_move = line['pv'][0];
2050 if (move_hash[first_move]) {
2051 var score = compute_score_sort_key(line['score'], line['depth'], invert);
2052 if (best_move_score === null || score > best_move_score) {
2053 best_move = move_hash[first_move];
2054 best_move_score = score;
2061 var onDrop = function(source, target) {
2062 if (source === target) {
2063 if (recommended_move === null) {
2066 // Accept the move. It will be changed in onSnapEnd.
2070 // Suggestion not asked for.
2071 recommended_move = null;
2074 // see if the move is legal
2075 var pseudogame = new Chess(display_fen);
2076 var move = pseudogame.move({
2079 promotion: 'q' // NOTE: always promote to a queen for example simplicity
2083 if (move === null) return 'snapback';
2086 var onSnapEnd = function(source, target) {
2087 if (source === target && recommended_move !== null) {
2088 source = recommended_move.from;
2089 target = recommended_move.to;
2091 recommended_move = null;
2092 var pseudogame = new Chess(display_fen);
2093 var move = pseudogame.move({
2096 promotion: 'q' // NOTE: always promote to a queen for example simplicity
2099 if (current_display_line &&
2100 current_display_move < current_display_line.pv.length - 1 &&
2101 current_display_line.pv[current_display_move + 1] === move.san) {
2106 // Walk down the displayed lines until we find one that starts with
2107 // this move, then select that. Note that this gives us a good priority
2108 // order (history first, then PV, then multi-PV lines).
2109 for (var i = 0; i < display_lines.length; ++i) {
2110 if (i == 1 && current_display_line) {
2111 // Do not choose PV if not on it.
2114 var line = display_lines[i];
2115 if (line.pv[line.start_display_move_num] === move.san) {
2121 // Shouldn't really be here if we have hash probes, but there's really
2122 // nothing we can do.
2124 // End of dragging-related code.
2126 var fmt_cp = function(v) {
2130 return "+" + (v / 100).toFixed(2);
2133 return "-" + (v / 100).toFixed(2);
2137 var format_short_score = function(score) {
2141 if (score[0] === 'T' || score[0] === 't') {
2142 var ret = "TB\u00a0";
2143 if (score[2]) { // Is a bound.
2144 ret = score[2] + "\u00a0TB\u00a0";
2146 if (score[0] === 'T') {
2147 return ret + Math.ceil(score[1] / 2);
2149 return ret + "-" + Math.ceil(score[1] / 2);
2151 } else if (score[0] === 'M' || score[0] === 'm') {
2152 var sign = (score[0] === 'm') ? '-' : '';
2153 if (score[2]) { // Is a bound.
2154 return score[2] + "\u00a0M " + sign + score[1];
2156 return "M " + sign + score[1];
2158 } else if (score[0] === 'd') {
2160 } else if (score[0] === 'cp') {
2161 if (score[2]) { // Is a bound.
2162 return score[2] + "\u00a0" + fmt_cp(score[1]);
2164 return fmt_cp(score[1]);
2170 var format_long_score = function(score) {
2174 if (score[0] === 'T') {
2175 if (score[1] == 0) {
2176 return "Won for white (tablebase)";
2178 return "White wins in " + Math.ceil(score[1] / 2);
2180 } else if (score[0] === 't') {
2181 if (score[1] == -1) {
2182 return "Won for black (tablebase)";
2184 return "Black wins in " + Math.ceil(score[1] / 2);
2186 } else if (score[0] === 'M') {
2187 if (score[1] == 0) {
2188 return "White wins by checkmate";
2190 return "White mates in " + score[1];
2192 } else if (score[0] === 'm') {
2193 if (score[1] == 0) {
2194 return "Black wins by checkmate";
2196 return "Black mates in " + score[1];
2198 } else if (score[0] === 'd') {
2199 return "Theoretical draw";
2200 } else if (score[0] === 'cp') {
2201 return "Score: " + format_short_score(score);
2206 var compute_plot_score = function(score) {
2207 if (score[0] === 'M' || score[0] === 'T') {
2209 } else if (score[0] === 'm' || score[0] === 't') {
2211 } else if (score[0] === 'd') {
2213 } else if (score[0] === 'cp') {
2214 if (score[1] > 500) {
2216 } else if (score[1] < -500) {
2226 * @param score The score digest tuple.
2227 * @param {?number} depth Depth the move has been computed to, or null.
2228 * @param {boolean} invert Whether black is to play.
2229 * @param {boolean=} depth_secondary_key
2232 var compute_score_sort_key = function(score, depth, invert, depth_secondary_key) {
2237 if (score[0] === 'T') {
2238 // White reaches TB win.
2239 s = 89999 - score[1];
2240 } else if (score[0] === 't') {
2241 // Black reaches TB win.
2242 s = -(89999 - score[1]);
2243 } else if (score[0] === 'M') {
2245 s = 99999 - score[1];
2246 } else if (score[0] === 'm') {
2248 s = -(99999 - score[1]);
2249 } else if (score[0] === 'd') {
2251 } else if (score[0] === 'cp') {
2256 if (depth_secondary_key) {
2257 return s * 200 + (depth || 0);
2267 * @param {Object} game
2269 var switch_backend = function(game) {
2270 // Stop looking at historic data.
2271 current_display_line = null;
2272 current_display_move = null;
2273 displayed_analysis_data = null;
2274 if (current_historic_xhr) {
2275 current_historic_xhr.abort();
2278 // If we already have a backend response going, abort it.
2279 if (current_analysis_xhr) {
2280 current_analysis_xhr.abort();
2282 if (current_hash_xhr) {
2283 current_hash_xhr.abort();
2286 // Otherwise, we should have a timer going to start a new one.
2288 if (current_analysis_request_timer) {
2289 clearTimeout(current_analysis_request_timer);
2290 current_analysis_request_timer = null;
2292 if (current_hash_display_timer) {
2293 clearTimeout(current_hash_display_timer);
2294 current_hash_display_timer = null;
2297 // Request an immediate fetch with the new backend.
2298 backend_url = game['url'];
2299 backend_hash_url = game['hashurl'];
2300 window.location.hash = '#' + game['id'];
2301 current_analysis_data = null;
2305 window['switch_backend'] = switch_backend;
2307 window['flip'] = function() { board.flip(); redraw_arrows(); };
2308 window['set_delay_ms'] = function(ms) { delay_ms = ms; console.log('Delay is now ' + ms + ' ms.'); };
2310 // Mostly from Wikipedia's chess set as of October 2022, but some pieces are from
2311 // the 2013 version, as I like those better (and it matches the 2014 PNGs; nobody
2312 // really likes change, do they?). That is wK, bK, bQ. wQ is also slightly different,
2313 // but not enough to notice.
2314 const svg_pieces = {
2315 'wK': 'data:image/svg+xml;base64,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',
2316 'wQ': 'data:image/svg+xml;base64,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',
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2323 'bR': 'data:image/svg+xml;base64,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',
2324 'bB': 'data:image/svg+xml;base64,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',
2325 'bN': 'data:image/svg+xml;base64,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',
2326 'bP': 'data:image/svg+xml;base64,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',
2329 var svg_piece_theme = function(piece) {
2330 return svg_pieces[piece];
2333 var init = function() {
2334 unique = get_unique();
2336 // Load settings from HTML5 local storage if available.
2337 if (supports_html5_storage() && localStorage['enable_sound']) {
2338 set_sound(parseInt(localStorage['enable_sound']));
2344 board = new window.ChessBoard('board', {
2345 onMoveEnd: function() { board_is_animating = false; },
2348 pieceTheme: svg_piece_theme,
2349 onDragStart: onDragStart,
2351 onSnapEnd: onSnapEnd
2353 $("#board").on('mousedown', '.square-55d63', mousedownSquare);
2354 $("#board").on('mouseup', '.square-55d63', mouseupSquare);
2357 $(window).resize(function() {
2359 update_sparkline(displayed_analysis_data || current_analysis_data);
2360 update_board_highlight();
2363 $(window).keyup(function(event) {
2364 if (event.which == 39) { // Left arrow.
2366 } else if (event.which == 37) { // Right arrow.
2368 } else if (event.which >= 49 && event.which <= 57) { // 1-9.
2369 var num = event.which - 49;
2370 if (current_games && current_games.length >= num) {
2371 switch_backend(current_games[num]);
2373 } else if (event.which == 78) { // N.
2377 window.addEventListener('hashchange', possibly_switch_game_from_hash, false);
2378 possibly_switch_game_from_hash();
2380 $(document).ready(init);