5 * Version of this script. If the server returns a version larger than
6 * this, it is a sign we should reload to upgrade ourselves.
11 let SCRIPT_VERSION = 2023122700;
14 * The current backend URL.
19 let backend_url = "/analysis.pl";
20 let backend_hash_url = "/hash";
22 /** @type {window.ChessBoard} @private */
25 /** @type {boolean} @private */
26 let board_is_animating = false;
29 * The most recent analysis data we have from the server
30 * (about the most recent position).
34 let current_analysis_data = null;
37 * If we are displaying previous analysis or from hash, this is non-null,
38 * and will override most of current_analysis_data.
43 let displayed_analysis_data = null;
46 * Games currently in progress, if any.
58 let current_games = null;
73 /** @type {Array.<Array.<boolean>>} */
74 let occupied_by_arrows = [];
76 /** Currently displayed refutation lines (on-screen).
77 * Can either come from the current_analysis_data, displayed_analysis_data,
78 * or hash_refutation_lines.
80 * TODO: This is a mess, and we should probably just let update_refutation_lines()
81 * decide anew every time instead of storing the state here in multiple global
84 let refutation_lines = [];
86 /** Refutation lines from current hash probe.
88 * If non-null, will override refutation lines from the base position.
89 * Note that these are relative to display_fen, not base_fen.
91 let hash_refutation_lines = null;
94 * What FEN refutation_lines is relative to. Will usually be base_fen,
95 * but if another move gets loaded while we are looking, they can diverge.
97 let refutation_lines_base_fen = null;
99 /** @type {number} @private */
102 /** @type {boolean} @private */
103 let truncate_display_history = true;
105 /** @type {!string|undefined} @private */
106 let highlight_from = undefined;
108 /** @type {!string|undefined} @private */
109 let highlight_to = undefined;
111 /** The HTML object of the move currently being highlighted (in red).
114 let highlighted_move = null;
116 /** Currently suggested/recommended move when dragging.
117 * @type {?{from: !string, to: !string}}
120 let recommended_move = null;
122 /** If reverse-dragging (dragging from the destination square to the
123 * source square), the destination square.
127 let reverse_dragging_from = null;
129 /** @type {?number} @private */
132 /** @type {?string} @private */
133 let admin_password = null;
135 /** @type {boolean} @private */
136 let enable_sound = false;
138 /** @type {!number} @private */
142 * Our best estimate of how many milliseconds we need to add to
143 * new Date() to get the true UTC time. Calibrated against the
149 let client_clock_offset_ms = null;
151 let clock_timer = null;
153 /** The current position being analyzed, represented as a FEN string.
154 * Note that this is not necessarily the same as display_fen.
160 /** The current position on the board, represented as a FEN string.
161 * Note that board.fen() does not contain e.g. who is to play.
165 let display_fen = null;
169 * pv: Array.<string>,
172 * scores: Array<{first_move: number, score: Object}>,
173 * start_display_move_num: number
176 * "start_display_move_num" is the (half-)move number to start displaying the PV at.
177 * "score" is also evaluated at this point.
180 /** All PVs that we currently know of.
182 * Element 0 is history (or null if no history).
183 * Element 1 is current main PV, or explored line if nowhere else on the screen.
184 * All remaining elements are refutation lines (multi-PV).
186 * @type {Array.<DisplayLine>}
189 let display_lines = [];
191 /** @type {?DisplayLine} @private */
192 let current_display_line = null;
194 /** @type {boolean} @private */
195 let current_display_line_is_history = false;
197 /** @type {?number} @private */
198 let current_display_move = null;
201 * The current backend request to get main analysis (not history), if any,
202 * so that we can abort it.
204 * @type {?AbortController}
207 let current_analysis_xhr = null;
210 * The current timer to fire off a request to get main analysis (not history),
211 * if any, so that we can abort it.
216 let current_analysis_request_timer = null;
219 * The current backend request to get historic data, if any.
221 * @type {?AbortController}
224 let current_historic_xhr = null;
227 * The current backend request to get hash probes, if any, so that we can abort it.
229 * @type {?AbortController}
232 let current_hash_xhr = null;
235 * The current timer to display hash probe information (it could be waiting on the
236 * board to stop animating), if any, so that we can abort it.
241 let current_hash_display_timer = null;
243 function supports_html5_storage() {
245 return 'localStorage' in window && window['localStorage'] !== null;
251 // Make the unique token persistent so people refreshing the page won't count twice.
252 // Of course, you can never fully protect against people deliberately wanting to spam.
253 function get_unique() {
254 let use_local_storage = supports_html5_storage();
255 if (use_local_storage && window['localStorage']['unique']) {
256 return window['localStorage']['unique'];
258 let unique = Math.random();
259 if (use_local_storage) {
260 window['localStorage']['unique'] = unique;
265 function request_update() {
266 current_analysis_request_timer = null;
268 let handle_err = () => {
269 // Backend error or similar. Wait ten seconds, then try again.
270 current_analysis_request_timer = setTimeout(function() { request_update(); }, 10000);
273 current_analysis_xhr = new AbortController();
274 const signal = current_analysis_xhr.signal;
275 fetch(backend_url + "?ims=" + ims + "&unique=" + unique, { signal })
276 .then((response) => response.json().then(data => ({ok: response.ok, headers: response.headers, json: data}))) // ick
283 if (delay_ms === 0) {
284 process_update_response(obj.json, obj.headers);
286 setTimeout(function() { process_update_response(obj.json, obj.headers); }, delay_ms);
290 if (!backend_url.match(/history/)) {
292 current_analysis_request_timer = setTimeout(function() { request_update(); }, timeout);
296 if (err.name === 'AbortError') {
297 // Aborted because we are switching backends. Abandon and don't retry,
298 // because another one is already started for us.
306 document.body.style.opacity = null;
311 function process_update_response(data, headers) {
312 sync_server_clock(headers.get('Date'));
313 ims = headers.get('X-RGLM');
314 let num_viewers = headers.get('X-RGNV');
316 if (Array.isArray(data)) {
317 new_data = JSON.parse(JSON.stringify(current_analysis_data));
318 JSON_delta.patch(new_data, data);
323 let minimum_version = headers.get('X-RGMV');
324 if (minimum_version && minimum_version > SCRIPT_VERSION) {
325 // Upgrade to latest version with a force-reload.
326 location.reload(true);
329 // Verify that the PV makes sense.
331 if (new_data['pv']) {
332 let hiddenboard = new Chess(new_data['position']['fen']);
333 for (let i = 0; i < new_data['pv'].length; ++i) {
334 if (hiddenboard.move(new_data['pv'][i]) === null) {
342 possibly_play_sound(current_analysis_data, new_data);
343 current_analysis_data = new_data;
345 update_num_viewers(num_viewers);
347 console.log("Received invalid update, waiting five seconds and trying again.");
348 setTimeout(function() { location.reload(true); }, 5000);
352 function possibly_play_sound(old_data, new_data) {
356 if (old_data === null) {
359 let ding = document.getElementById('ding');
360 if (ding && ding.play) {
361 if (old_data['position'] && old_data['position']['fen'] &&
362 new_data['position'] && new_data['position']['fen'] &&
363 old_data['position']['fen'] !== new_data['position']['fen']) {
370 * @type {!string} server_date_string
372 function sync_server_clock(server_date_string) {
373 let server_time_ms = new Date(server_date_string).getTime();
374 let client_time_ms = new Date().getTime();
375 let estimated_offset_ms = server_time_ms - client_time_ms;
377 // In order not to let the noise move us too much back and forth
378 // (the server only has one-second resolution anyway), we only
379 // change an existing skew if we are at least five seconds off.
380 if (client_clock_offset_ms === null ||
381 Math.abs(estimated_offset_ms - client_clock_offset_ms) > 5000) {
382 client_clock_offset_ms = estimated_offset_ms;
386 function clear_arrows() {
387 for (let i = 0; i < arrows.length; ++i) {
389 arrows[i].svg.remove();
390 delete arrows[i].svg;
395 occupied_by_arrows = [];
396 for (let y = 0; y < 8; ++y) {
397 occupied_by_arrows.push([false, false, false, false, false, false, false, false]);
401 function redraw_arrows() {
402 for (let i = 0; i < arrows.length; ++i) {
403 position_arrow(arrows[i]);
407 /** @param {!string} fen
410 * Return whose side it is to play (w or b), given a FEN.
412 function find_toplay(fen) {
413 return fen.split(' ')[1];
416 /** @param {!string} fen
419 * Return the move clock, starting from 1. See also find_toplay().
421 function find_move_num(fen) {
422 return parseInt(fen.split(' ')[5]);
425 /** @param {!number} x
438 /** See if drawing this arrow on the board would cause unduly amount of confusion.
439 * @param {!string} from The square the arrow is from (e.g. e4).
440 * @param {!string} to The square the arrow is to (e.g. e4).
443 function interfering_arrow(from, to) {
444 let from_col = from.charCodeAt(0) - "a1".charCodeAt(0);
445 let from_row = from.charCodeAt(1) - "a1".charCodeAt(1);
446 let to_col = to.charCodeAt(0) - "a1".charCodeAt(0);
447 let to_row = to.charCodeAt(1) - "a1".charCodeAt(1);
449 occupied_by_arrows[from_row][from_col] = true;
451 // Knight move: Just check that we haven't been at the destination before.
452 if ((Math.abs(to_col - from_col) == 2 && Math.abs(to_row - from_row) == 1) ||
453 (Math.abs(to_col - from_col) == 1 && Math.abs(to_row - from_row) == 2)) {
454 return occupied_by_arrows[to_row][to_col];
457 // Sliding piece: Check if anything except the from-square is seen before.
458 let dx = sign(to_col - from_col);
459 let dy = sign(to_row - from_row);
465 if (occupied_by_arrows[y][x]) {
468 occupied_by_arrows[y][x] = true;
469 } while (x != to_col || y != to_row);
474 /** Find a point along the coordinate system given by the given line,
475 * <t> units forward from the start of the line, <u> units to the right of it.
476 * @param {!number} x1
477 * @param {!number} x2
478 * @param {!number} y1
479 * @param {!number} y2
482 * @return {!string} The point in "x y" form, suitable for SVG paths.
484 function point_from_start(x1, y1, x2, y2, t, u) {
488 let norm = 1.0 / Math.sqrt(dx * dx + dy * dy);
492 let x = x1 + dx * t + dy * u;
493 let y = y1 + dy * t - dx * u;
497 /** Find a point along the coordinate system given by the given line,
498 * <t> units forward from the end of the line, <u> units to the right of it.
499 * @param {!number} x1
500 * @param {!number} x2
501 * @param {!number} y1
502 * @param {!number} y2
505 * @return {!string} The point in "x y" form, suitable for SVG paths.
507 function point_from_end(x1, y1, x2, y2, t, u) {
511 let norm = 1.0 / Math.sqrt(dx * dx + dy * dy);
515 let x = x2 + dx * t + dy * u;
516 let y = y2 + dy * t - dx * u;
520 function position_arrow(arrow) {
522 if (arrow.svg.parentElement) {
523 arrow.svg.parentElement.removeChild(arrow.svg);
527 if (current_display_line !== null && !current_display_line_is_history) {
531 // We always draw as if the board is 400x400, the viewBox will adjust that for us
532 let line_width = arrow.line_width;
533 let arrow_size = arrow.arrow_size;
535 let square_width = 400 / 8;
536 let from_y, to_y, from_x, to_x;
537 if (board.orientation() === 'black') {
538 from_y = (arrow.from_row + 0.5)*square_width;
539 to_y = (arrow.to_row + 0.5)*square_width;
540 from_x = (7 - arrow.from_col + 0.5)*square_width;
541 to_x = (7 - arrow.to_col + 0.5)*square_width;
543 from_y = (7 - arrow.from_row + 0.5)*square_width;
544 to_y = (7 - arrow.to_row + 0.5)*square_width;
545 from_x = (arrow.from_col + 0.5)*square_width;
546 to_x = (arrow.to_col + 0.5)*square_width;
549 let SVG_NS = "http://www.w3.org/2000/svg";
550 let XHTML_NS = "http://www.w3.org/1999/xhtml";
551 let svg = document.createElementNS(SVG_NS, "svg");
552 svg.setAttribute("width", "100%");
553 svg.setAttribute("height", "100%");
554 svg.setAttribute("viewBox", "0 0 400 400");
555 svg.setAttribute("version", "1.1");
556 svg.setAttribute("class", "c1");
557 svg.setAttribute("xmlns", XHTML_NS);
565 let outline = document.createElementNS(SVG_NS, "path");
566 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));
567 outline.setAttribute("xmlns", XHTML_NS);
568 outline.setAttribute("stroke", "#666");
569 outline.setAttribute("stroke-width", line_width + 2);
570 outline.setAttribute("fill", "none");
571 svg.appendChild(outline);
573 let path = document.createElementNS(SVG_NS, "path");
574 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));
575 path.setAttribute("xmlns", XHTML_NS);
576 path.setAttribute("stroke", arrow.fg_color);
577 path.setAttribute("stroke-width", line_width);
578 path.setAttribute("fill", "none");
579 svg.appendChild(path);
581 // Then the arrow head.
582 let head = document.createElementNS(SVG_NS, "path");
583 head.setAttribute("d",
584 "M " + point_from_end(x1, y1, x2, y2, 0, 0) +
585 " L " + point_from_end(x1, y1, x2, y2, -arrow_size, -arrow_size / 2) +
586 " L " + point_from_end(x1, y1, x2, y2, -arrow_size * .623, 0.0) +
587 " L " + point_from_end(x1, y1, x2, y2, -arrow_size, arrow_size / 2) +
588 " L " + point_from_end(x1, y1, x2, y2, 0, 0));
589 head.setAttribute("xmlns", XHTML_NS);
590 head.setAttribute("stroke", "#000");
591 head.setAttribute("stroke-width", "1");
592 head.setAttribute("fill", arrow.fg_color);
593 svg.appendChild(head);
595 svg.style.position = 'absolute';
596 svg.style.top = '0px'; /* Border for .board-b72b1. */
597 svg.style.left = '0px';
598 svg.style.pointerEvents = 'none';
599 document.getElementById('board').appendChild(svg);
604 * @param {!string} from_square
605 * @param {!string} to_square
606 * @param {!string} fg_color
607 * @param {number} line_width
608 * @param {number} arrow_size
610 function create_arrow(from_square, to_square, fg_color, line_width, arrow_size) {
611 let from_col = from_square.charCodeAt(0) - "a1".charCodeAt(0);
612 let from_row = from_square.charCodeAt(1) - "a1".charCodeAt(1);
613 let to_col = to_square.charCodeAt(0) - "a1".charCodeAt(0);
614 let to_row = to_square.charCodeAt(1) - "a1".charCodeAt(1);
622 line_width: line_width,
623 arrow_size: arrow_size,
627 position_arrow(arrow);
631 function compare_by_score(refutation_lines, invert, a, b) {
632 let sa = compute_score_sort_key(refutation_lines[b]['score'], refutation_lines[b]['depth'], invert);
633 let sb = compute_score_sort_key(refutation_lines[a]['score'], refutation_lines[a]['depth'], invert);
638 * Fake multi-PV using the refutation lines. Find all “relevant” moves,
639 * sorted by quality, descending.
641 * @param {!Object} data
642 * @param {number} margin The maximum number of centipawns worse than the
643 * best move can be and still be included.
644 * @param {boolean} invert Whether black is to play.
645 * @return {Array.<string>} The FEN representation (e.g. Ne4) of all
646 * moves, in score order.
648 function find_nonstupid_moves(data, margin, invert) {
649 // First of all, if there are any moves that are more than 0.5 ahead of
650 // the primary move, the refutation lines are probably bunk, so just
652 let best_score = undefined;
653 let pv_score = undefined;
654 for (let move in data['refutation_lines']) {
655 let line = data['refutation_lines'][move];
656 let score = compute_score_sort_key(line['score'], line['depth'], invert);
657 if (move == data['pv'][0]) {
660 if (best_score === undefined || score > best_score) {
663 if (line['depth'] < 8) {
668 if (best_score - pv_score > 50) {
672 // Now find all moves that are within “margin” of the best score.
673 // The PV move will always be first.
675 for (let move in data['refutation_lines']) {
676 let line = data['refutation_lines'][move];
677 let score = compute_score_sort_key(line['score'], line['depth'], invert);
678 if (move != data['pv'][0] && best_score - score <= margin) {
682 let toplay = find_toplay(data['position']['fen']);
683 moves = moves.sort(function(a, b) { return compare_by_score(data['refutation_lines'], toplay, a, b) });
684 moves.unshift(data['pv'][0]);
693 function thousands(x) {
694 return String(x).split('').reverse().join('').replace(/(\d{3}\B)/g, '$1,').split('').reverse().join('');
698 * @param {!string} start_fen
699 * @param {Array.<string>} pv
700 * @param {Array<{ first_move: integer, score: Object }>} scores
701 * @param {number} start_display_move_num
702 * @param {number=} opt_limit
703 * @param {boolean=} opt_showlast
705 function add_pv(start_fen, pv, scores, start_display_move_num, opt_limit, opt_showlast) {
707 start_fen: start_fen,
709 move_num: find_move_num(start_fen),
710 toplay: find_toplay(start_fen),
712 start_display_move_num: start_display_move_num
714 let splicepos = null;
715 if (scores !== null && scores.length >= 1 &&
716 scores[scores.length - 1].score !== undefined &&
717 scores[scores.length - 1].score !== null &&
718 (scores[scores.length - 1].score[0] === 'T' ||
719 scores[scores.length - 1].score[0] === 't')) {
720 splicepos = scores[scores.length - 1].score[1];
722 return print_pv(display_lines.length - 1, splicepos, opt_limit, opt_showlast);
726 * @param {number} line_num
727 * @param {?number} splicepos If non-null, where the tablebase-spliced portion of the TB starts.
728 * @param {number=} opt_limit If set, show at most this number of moves.
729 * @param {boolean=} opt_showlast If limit is set, show the last moves instead of the first ones.
731 function print_pv(line_num, splicepos, opt_limit, opt_showlast) {
732 let display_line = display_lines[line_num];
733 let pv = display_line.pv;
734 let move_num = display_line.move_num;
735 let toplay = display_line.toplay;
737 // Truncate PV at the start if needed.
738 let start_display_move_num = display_line.start_display_move_num;
739 if (start_display_move_num > 0) {
740 pv = pv.slice(start_display_move_num);
741 let to_add = start_display_move_num;
742 if (toplay === 'b') {
747 if (to_add % 2 == 1) {
751 move_num += to_add / 2;
752 if (splicepos !== null && splicepos > 0) {
757 let ret = document.createDocumentFragment();
760 if (opt_limit && opt_showlast && pv.length > opt_limit) {
761 // Truncate the PV at the beginning (instead of at the end).
762 // We assume here that toplay is 'w'. We also assume that if
763 // opt_showlast is set, then it is the history, and thus,
764 // the UI should be to expand the history.
765 ret.appendChild(document.createTextNode('('));
766 let link = document.createElement('a');
767 link.className = 'move';
768 link.href = 'javascript:collapse_history(false)';
769 link.textContent = '…';
770 ret.appendChild(link);
771 ret.appendChild(document.createTextNode(') '));
772 i = pv.length - opt_limit;
777 } else if (toplay == 'b' && pv.length > 0) {
778 ret.appendChild(document.createTextNode(move_num + '. … '));
780 for (; i < pv.length; ++i) {
782 if (splicepos === i) {
787 if (toplay == 'b' && i == 0) {
790 } else if (toplay == 'w') {
791 if (i > opt_limit && !opt_showlast) {
795 ret.appendChild(document.createTextNode(prefix + ' (…)'));
798 prefix += ' ' + move_num + '. ';
805 ret.appendChild(document.createTextNode(prefix));
807 let link = document.createElement('a');
808 link.className = 'move';
809 link.setAttribute('id', 'automove' + line_num + '-' + i);
810 link.textContent = pv[i];
811 link.href = 'javascript:show_line(' + line_num + ', ' + i + ');';
812 ret.appendChild(link);
815 ret.appendChild(document.createTextNode(')'));
820 /** Update the highlighted to/from squares on the board.
821 * Based on the global "highlight_from" and "highlight_to" letiables.
823 function update_board_highlight() {
824 document.getElementById("board").querySelectorAll('.square-55d63').forEach((square) => square.classList.remove('nonuglyhighlight'));
825 if ((current_display_line === null || current_display_line_is_history) &&
826 highlight_from !== undefined && highlight_to !== undefined) {
827 document.getElementById("board").querySelector('.square-' + highlight_from).classList.add('nonuglyhighlight');
828 document.getElementById("board").querySelector('.square-' + highlight_to).classList.add('nonuglyhighlight');
832 function update_history() {
833 let history = document.getElementById('history');
834 if (display_lines[0] === null || display_lines[0].pv.length == 0) {
835 history.textContent = 'No history';
836 } else if (truncate_display_history) {
837 history.replaceChildren(print_pv(0, null, 8, true));
839 history.textContent = '(';
840 let link = document.createElement('a');
841 link.className = 'move';
842 link.href = 'javascript:collapse_history(true)';
843 link.textContent = 'collapse';
844 history.appendChild(link);
845 history.appendChild(document.createTextNode(') '));
846 history.append(print_pv(0, null));
851 * @param {!boolean} truncate_history
853 function collapse_history(truncate_history) {
854 truncate_display_history = truncate_history;
857 window['collapse_history'] = collapse_history;
859 /** Update the HTML display of multi-PV from the global "refutation_lines".
861 * Also recreates the global "display_lines".
863 function update_refutation_lines() {
864 if (refutation_lines_base_fen === null) {
867 if (display_lines.length > 2) {
868 // Truncate so that only the history and PV is left.
869 display_lines = [ display_lines[0], display_lines[1] ];
871 let tbl = document.getElementById("refutationlines");
872 tbl.replaceChildren();
874 if (display_lines.length < 2) {
875 // Update the move highlight, as we've rewritten all the HTML.
876 update_move_highlight();
880 // Find out where the lines start from.
882 let base_scores = display_lines[1].scores;
883 let start_display_move_num = 0;
884 if (hash_refutation_lines) {
885 base_line = current_display_line.pv.slice(0, current_display_move + 1);
886 base_scores = current_display_line.scores;
887 start_display_move_num = base_line.length;
891 for (let move in refutation_lines) {
895 let invert = (find_toplay(refutation_lines_base_fen) === 'b');
896 if (current_display_line && current_display_move % 2 == 0 && !current_display_line_is_history) {
899 moves = moves.sort(function(a, b) { return compare_by_score(refutation_lines, invert, a, b) });
900 for (let i = 0; i < moves.length; ++i) {
901 let line = refutation_lines[moves[i]];
903 let tr = document.createElement("tr");
905 let move_td = document.createElement("td");
906 tr.appendChild(move_td);
907 move_td.classList.add("move");
909 let scores = base_scores.concat([{ first_move: start_display_move_num, score: line['score'] }]);
911 if (line['pv'].length == 0) {
912 // Not found, so just make a one-move PV.
913 let link = document.createElement('a');
914 link.className = 'move';
915 link.href = 'javascript:show_line(' + display_lines.length + ', ' + 0 + ')';
916 link.textContent = line['move'];
917 move_td.replaceChildren(link);
919 let score_td = document.createElement("td");
920 score_td.classList.add("score");
921 score_td.textContent = "—";
922 tr.appendChild(score_td);
924 let depth_td = document.createElement("td");
925 tr.appendChild(depth_td);
926 depth_td.classList.add("depth");
927 depth_td.textContent = "—";
929 let pv_td = document.createElement("td");
930 tr.appendChild(pv_td);
931 pv_td.classList.add("pv");
932 pv_td.append(add_pv(refutation_lines_base_fen, base_line.concat([ line['move'] ]), scores, start_display_move_num));
938 let move_link = document.createElement("a");
939 move_link.classList.add("move");
940 move_link.setAttribute("href", "javascript:show_line(" + display_lines.length + ", 0)");
941 move_link.textContent = line['move'];
942 move_td.appendChild(move_link);
944 let score_td = document.createElement("td");
945 tr.appendChild(score_td);
946 score_td.classList.add("score");
947 score_td.textContent = format_short_score(line['score']);
949 let depth_td = document.createElement("td");
950 tr.appendChild(depth_td);
951 depth_td.classList.add("depth");
952 if (line['depth'] && line['depth'] >= 0) {
953 depth_td.textContent = "d" + line['depth'];
955 depth_td.textContent = "—";
958 let pv_td = document.createElement("td");
959 tr.appendChild(pv_td);
960 pv_td.classList.add("pv");
961 pv_td.append(add_pv(refutation_lines_base_fen, base_line.concat(line['pv']), scores, start_display_move_num, 10));
966 // Update the move highlight, as we've rewritten all the HTML.
967 update_move_highlight();
971 * Create a Chess.js board object, containing the given position plus the given moves,
972 * up to the given limit.
974 * @param {?string} fen
975 * @param {Array.<string>} moves
976 * @param {number} last_move
978 function chess_from(fen, moves, last_move) {
979 let hiddenboard = new Chess();
980 if (fen !== null && fen !== undefined) {
981 hiddenboard.load(fen);
983 for (let i = 0; i <= last_move; ++i) {
984 if (moves[i] === '0-0') {
985 hiddenboard.move('O-O');
986 } else if (moves[i] === '0-0-0') {
987 hiddenboard.move('O-O-O');
989 hiddenboard.move(moves[i]);
995 function update_game_list(games) {
996 document.getElementById("games").textContent = "";
997 if (games === null) {
1001 let games_div = document.getElementById('games');
1002 for (let game_num = 0; game_num < games.length; ++game_num) {
1003 let game = games[game_num];
1004 let game_span = document.createElement("span");
1005 game_span.setAttribute("class", "game");
1007 let game_name = document.createTextNode(game['name']);
1008 if (game['url'] === backend_url) {
1010 game_span.appendChild(game_name);
1012 if (current_analysis_data && current_analysis_data['position']) {
1014 if (current_analysis_data['position']['result']) {
1015 score = " (" + current_analysis_data['position']['result'] + ")";
1017 score = " (" + format_short_score(current_analysis_data['score']) + ")";
1019 game_span.appendChild(document.createTextNode(score));
1023 let game_a = document.createElement("a");
1024 game_a.setAttribute("href", "#" + game['id']);
1025 game_a.appendChild(game_name);
1026 game_span.appendChild(game_a);
1029 if (game['result']) {
1030 score = " (" + game['result'] + ")";
1032 score = " (" + format_short_score(game['score']) + ")";
1034 game_span.appendChild(document.createTextNode(score));
1037 games_div.appendChild(game_span);
1042 * Try to find a running game that matches with the current hash,
1043 * and switch to it if we're not already displaying it.
1045 function possibly_switch_game_from_hash() {
1046 let history_match = window.location.hash.match(/^#history=([a-zA-Z0-9_-]+)/);
1047 if (history_match !== null) {
1048 let game_id = history_match[1];
1050 url: '/history/' + game_id + '.json',
1052 id: 'history=' + game_id
1054 switch_backend(fake_game);
1058 if (current_games === null) {
1062 let hash = window.location.hash.replace(/^#/,'');
1063 for (let i = 0; i < current_games.length; ++i) {
1064 if (current_games[i]['id'] === hash) {
1065 if (backend_url !== current_games[i]['url']) {
1066 switch_backend(current_games[i]);
1074 * If this is a Chess960 castling which doesn't move the king,
1075 * move the rook instead.
1077 function patch_move(move) {
1078 if (move === null) return null;
1079 if (move.from !== move.to) return move;
1081 let f = move.rook_sq & 15;
1082 let r = move.rook_sq >> 4;
1083 let from = ('abcdefgh'.substring(f,f+1) + '87654321'.substring(r,r+1));
1086 if (move.to === 'g1') {
1088 } else if (move.to === 'g8') {
1090 } else if (move.to === 'b1') {
1092 } else if (move.to === 'b8') {
1096 return { from: from, to: to };
1099 /** Update all the HTML on the page, based on current global state.
1101 function update_board() {
1102 document.body.style.opacity = null;
1104 let data = displayed_analysis_data || current_analysis_data;
1105 let current_data = current_analysis_data; // Convenience alias.
1109 // Print the history. This is pretty much the only thing that's
1110 // unconditionally taken from current_data (we're not interested in
1111 // historic history).
1112 if (current_data['position']['history']) {
1113 let start = (current_data['position'] && current_data['position']['start_fen']) ? current_data['position']['start_fen'] : 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1';
1114 add_pv(start, current_data['position']['history'], null, 0, 8, true);
1116 display_lines.push(null);
1120 // Games currently in progress, if any.
1121 if (current_data['games']) {
1122 current_games = current_data['games'];
1123 possibly_switch_game_from_hash();
1125 current_games = null;
1127 update_game_list(current_games);
1129 // The headline. Names are always fetched from current_data;
1130 // the rest can depend a bit.
1133 current_data['position']['player_w'] && current_data['position']['player_b']) {
1134 headline = current_data['position']['player_w'] + '–' +
1135 current_data['position']['player_b'] + ', analysis';
1137 headline = 'Analysis';
1140 // Credits: The engine name/version.
1141 if (current_data['engine'] && current_data['engine']['name'] !== null) {
1142 document.getElementById("engineid").textContent = current_data['engine']['name'];
1145 // Credits: The engine URL.
1146 if (current_data['engine'] && current_data['engine']['url']) {
1147 document.getElementById("engineid").setAttribute("href", current_data['engine']['url']);
1149 document.getElementById("engineid").removeAttribute("href");
1152 // Credits: Engine details.
1153 if (current_data['engine'] && current_data['engine']['details']) {
1154 document.getElementById("enginedetails").textContent = " (" + current_data['engine']['details'] + ")";
1156 document.getElementById("enginedetails").textContent = "";
1159 // Credits: Move source, possibly with URL.
1160 if (current_data['move_source'] && current_data['move_source_url']) {
1161 document.getElementById("movesource").textContent = "Moves provided by ";
1162 let movesource_a = document.createElement("a");
1163 movesource_a.setAttribute("href", current_data['move_source_url']);
1164 let movesource_text = document.createTextNode(current_data['move_source']);
1165 movesource_a.appendChild(movesource_text);
1166 let movesource_period = document.createTextNode(".");
1167 document.getElementById("movesource").appendChild(movesource_a);
1168 document.getElementById("movesource").appendChild(movesource_period);
1169 } else if (current_data['move_source']) {
1170 document.getElementById("movesource").textContent = "Moves provided by " + current_data['move_source'] + ".";
1172 document.getElementById("movesource").textContent = "";
1176 if (displayed_analysis_data) {
1177 // Displaying some non-current position, pick out the last move
1178 // from the history. This will work even if the fetch failed.
1179 if (current_display_move !== -1) {
1180 last_move = format_halfmove_with_number(
1181 current_display_line.pv[current_display_move],
1182 current_display_move);
1183 headline += ' after ' + last_move;
1185 } else if (data['position']['last_move'] !== 'none') {
1186 // Find the previous move.
1187 let previous_move_num, previous_toplay;
1188 let fen = data['position']['fen'];
1189 if (find_toplay(fen) === 'b') {
1190 previous_move_num = find_move_num(fen);
1191 previous_toplay = 'w';
1193 previous_move_num = find_move_num(fen) - 1;
1194 previous_toplay = 'b';
1197 last_move = format_move_with_number(
1198 data['position']['last_move'],
1200 previous_toplay == 'w');
1201 headline += ' after ' + last_move;
1205 document.getElementById("headline").textContent = headline;
1207 // The <title> contains a very brief headline.
1208 let title_elems = [];
1209 if (data['position'] && data['position']['result']) {
1210 title_elems.push(data['position']['result']);
1211 } else if (data['score']) {
1212 title_elems.push(format_short_score(data['score']));
1214 if (last_move !== null) {
1215 title_elems.push(last_move);
1218 if (title_elems.length != 0) {
1219 document.title = '(' + title_elems.join(', ') + ') analysis.sesse.net';
1221 document.title = 'analysis.sesse.net';
1224 // The last move (shown by highlighting the from and to squares).
1225 if (data['position'] && data['position']['last_move_uci']) {
1226 highlight_from = data['position']['last_move_uci'].substr(0, 2);
1227 highlight_to = data['position']['last_move_uci'].substr(2, 2);
1228 } else if (current_display_line_is_history && current_display_line && current_display_move >= 0) {
1229 // We don't have historic analysis for this position, but we
1230 // can reconstruct what the last move was by just replaying
1232 let position = (data['position'] && data['position']['start_fen']) ? data['position']['start_fen'] : null;
1233 let hiddenboard = chess_from(position, current_display_line.pv, current_display_move);
1234 let moves = hiddenboard.history({ verbose: true });
1235 last_move = moves.pop();
1236 highlight_from = last_move.from;
1237 highlight_to = last_move.to;
1239 highlight_from = highlight_to = undefined;
1241 update_board_highlight();
1243 if (data['failed']) {
1244 document.getElementById("score").textContent = "No analysis for this move";
1245 document.getElementById("pvtitle").textContent = "PV:";
1246 document.getElementById("pv").replaceChildren();
1247 document.getElementById("searchstats").innerHTML = " ";
1248 document.getElementById("refutationlines").replaceChildren();
1249 document.getElementById("whiteclock").replaceChildren();
1250 document.getElementById("blackclock").replaceChildren();
1251 refutation_lines = [];
1252 refutation_lines_base_fen = null;
1253 update_refutation_lines();
1255 update_displayed_line();
1256 update_move_highlight();
1260 if (clock_timer !== null) {
1261 clearTimeout(clock_timer);
1266 if (current_display_line && !current_display_line_is_history) {
1268 if (current_display_line.scores && current_display_line.scores.length > 0) {
1269 for (let i = 0; i < current_display_line.scores.length; ++i) {
1270 if (current_display_move < current_display_line.scores[i].first_move) {
1273 score = current_display_line.scores[i].score;
1277 document.getElementById("score").textContent = format_long_score(score);
1279 document.getElementById("score").textContent = "No score for this line";
1281 } else if (data['score']) {
1282 document.getElementById("score").textContent = format_long_score(data['score']);
1285 // The search stats.
1286 if (data['searchstats']) {
1287 document.getElementById("searchstats").textContent = data['searchstats'];
1288 } else if (data['nodes'] && data['nps'] && data['depth']) {
1289 let stats = thousands(data['nodes']) + ' nodes, ' + thousands(data['nps']) + ' nodes/sec, depth ' + data['depth'] + ' ply';
1290 if (data['seldepth']) {
1291 stats += ' (' + data['seldepth'] + ' selective)';
1293 if (data['tbhits'] && data['tbhits'] > 0) {
1294 if (data['tbhits'] == 1) {
1295 stats += ', one Syzygy hit';
1297 stats += ', ' + thousands(data['tbhits']) + ' Syzygy hits';
1301 document.getElementById("searchstats").textContent = stats;
1303 document.getElementById("searchstats").textContent = "";
1305 if (admin_password !== null) {
1306 document.getElementById("searchstats").innerHTML += " | <span style=\"color: red;\">ADMIN MODE (if password is right)</span>";
1309 // Update the board itself.
1310 base_fen = data['position']['fen'];
1311 update_displayed_line();
1314 document.getElementById("pvtitle").textContent = "PV:";
1316 let scores = [{ first_move: -1, score: data['score'] }];
1317 document.getElementById("pv").replaceChildren(add_pv(data['position']['fen'], data['pv'], scores, 0));
1319 // Update the PV arrow.
1321 let toplay = find_toplay(data['position']['fen']);
1322 if (data['pv'].length >= 1) {
1323 let hiddenboard = new Chess(base_fen);
1325 // draw a continuation arrow as long as it's the same piece
1327 for (let i = 0; i < data['pv'].length; i += 2) {
1328 let move = patch_move(hiddenboard.move(data['pv'][i]));
1330 if ((i >= 2 && move.from != last_to) ||
1331 interfering_arrow(move.from, move.to)) {
1334 create_arrow(move.from, move.to, '#f66', 6, 20);
1336 hiddenboard.move(data['pv'][i + 1]); // To keep continuity.
1339 let alt_moves = find_nonstupid_moves(data, 30, toplay === 'b');
1340 for (let i = 1; i < alt_moves.length && i < 3; ++i) {
1341 hiddenboard = new Chess(base_fen);
1342 let move = patch_move(hiddenboard.move(alt_moves[i]));
1343 if (move !== null) {
1344 create_arrow(move.from, move.to, '#f66', 1, 10);
1349 // See if all semi-reasonable moves have only one possible response.
1350 if (data['pv'].length >= 2) {
1351 let nonstupid_moves = find_nonstupid_moves(data, 300, toplay === 'b');
1352 let hiddenboard = new Chess(base_fen);
1353 hiddenboard.move(data['pv'][0]);
1354 let response = hiddenboard.move(data['pv'][1]);
1355 for (let i = 0; i < nonstupid_moves.length; ++i) {
1356 if (nonstupid_moves[i] == data['pv'][0]) {
1357 // ignore the PV move for refutation lines.
1360 if (!data['refutation_lines'] ||
1361 !data['refutation_lines'][nonstupid_moves[i]] ||
1362 !data['refutation_lines'][nonstupid_moves[i]]['pv'] ||
1363 data['refutation_lines'][nonstupid_moves[i]]['pv'].length < 2) {
1364 // Incomplete PV, abort.
1365 response = undefined;
1368 let line = data['refutation_lines'][nonstupid_moves[i]];
1369 hiddenboard = new Chess(base_fen);
1370 hiddenboard.move(line['pv'][0]);
1371 let this_response = hiddenboard.move(line['pv'][1]);
1372 if (this_response === null) {
1373 console.log("BUG: ", i);
1375 console.log(line['pv']);
1377 if (response.from !== this_response.from || response.to !== this_response.to) {
1378 // Different response depending on lines, abort.
1379 response = undefined;
1384 if (nonstupid_moves.length > 0 && response !== undefined) {
1385 create_arrow(response.from, response.to, '#66f', 6, 20);
1389 // Update the refutation lines.
1390 base_fen = data['position']['fen'];
1391 if (hash_refutation_lines === null) {
1392 refutation_lines = data['refutation_lines'];
1393 refutation_lines_base_fen = base_fen;
1395 update_refutation_lines();
1397 // Update the sparkline last, since its size depends on how everything else reflowed.
1398 update_sparkline(data);
1401 function update_sparkline(data) {
1402 let scorespark = document.getElementById('scoresparkcontainer');
1403 scorespark.textContent = '';
1404 if (data && data['score_history']) {
1405 let first_move_num = undefined;
1406 for (let halfmove_num in data['score_history']) {
1407 halfmove_num = parseInt(halfmove_num);
1408 if (first_move_num === undefined || halfmove_num < first_move_num) {
1409 first_move_num = halfmove_num;
1412 if (first_move_num !== undefined) {
1413 let fen = data['position']['fen'];
1414 let last_move_num = find_move_num(fen) * 2 - 3;
1415 if (find_toplay(fen) === 'b') {
1419 // Possibly truncate some moves if we don't have enough width.
1420 let max_moves = Math.floor(scorespark.getBoundingClientRect().width / 5) - 3;
1421 if (last_move_num - first_move_num > max_moves) {
1422 first_move_num = last_move_num - max_moves;
1427 let last_score = null;
1429 for (let halfmove_num = first_move_num; halfmove_num <= last_move_num; ++halfmove_num) {
1430 if (data['score_history'][halfmove_num]) {
1431 let score = compute_plot_score(data['score_history'][halfmove_num]);
1433 if (score < min_score) min_score = score;
1434 if (score > max_score) max_score = score;
1436 scores.push(last_score);
1438 if (data['score']) {
1439 let score = compute_plot_score(data['score']);
1441 if (score < min_score) min_score = score;
1442 if (score > max_score) max_score = score;
1444 if (max_score - min_score < 100) {
1445 if (Math.abs(max_score) >= Math.abs(min_score)) {
1446 max_score = min_score + 100;
1448 min_score = max_score - 100;
1452 const h = scorespark.getBoundingClientRect().height;
1454 let base_y = h - h * min_score / (min_score - max_score);
1455 for (let i = 0; i < scores.length; ++i) {
1456 let rect = document.createElementNS('http://www.w3.org/2000/svg', 'rect');
1457 //rect.setAttributeNS(null, 'stroke', "#000000");
1458 rect.setAttributeNS(null, 'x', i * 5)
1459 rect.setAttributeNS(null, 'width', 4);
1460 let extent = scores[i] * h / (max_score - min_score);
1461 if (extent > 0 && extent < 1) {
1463 } else if (extent < 0 && extent > -1) {
1468 if (scores[i] === 0) {
1469 color = [0.5, 0.5, 0.5];
1470 rect.setAttributeNS(null, 'y', base_y);
1471 rect.setAttributeNS(null, 'height', 1);
1472 } else if (scores[i] > 0) {
1473 color = [0.2, 0.4, 0.8];
1474 rect.setAttributeNS(null, 'y', base_y - extent);
1475 rect.setAttributeNS(null, 'height', extent + 1);
1477 color = [1.0, 0.267, 0.267];
1478 rect.setAttributeNS(null, 'y', base_y);
1479 rect.setAttributeNS(null, 'height', -extent + 1);
1481 let hlcolor = [color[0], color[1], color[2]];
1482 if (scores[i] !== 0) {
1483 hlcolor[0] = Math.min(hlcolor[0] * 1.4, 1.0);
1484 hlcolor[1] = Math.min(hlcolor[1] * 1.4, 1.0);
1485 hlcolor[2] = Math.min(hlcolor[2] * 1.4, 1.0);
1487 rect.style.fill = 'rgb(' + color[0]*100.0 + '%, ' + color[1]*100.0 + '%, ' + color[2]*100.0 + '%)';
1489 // score_history contains the Nth _position_, but format_tooltip
1490 // wants to format the Nth _move_; thus the -1.
1491 const tooltip = format_tooltip(data, i + first_move_num - 1);
1492 rect.addEventListener('mouseenter', (e) => draw_hover(e, hlcolor, tooltip));
1493 rect.addEventListener('mousemove', (e) => draw_hover(e, hlcolor, tooltip));
1494 rect.addEventListener('mouseleave', (e) => hide_hover(e, color));
1495 rect.addEventListener('click', (e) => { hide_hover(e, color); show_line(0, i + first_move_num - 1) });
1496 scorespark.appendChild(rect);
1502 function draw_hover(e, color, tooltip) {
1503 e.target.style.fill = 'rgb(' + color[0]*100.0 + '%, ' + color[1]*100.0 + '%, ' + color[2]*100.0 + '%)';
1505 let hover = document.getElementById('sparklinehover');
1506 hover.textContent = tooltip;
1507 hover.style.display = 'initial';
1509 let left = Math.max(e.pageX + 10, window.pageXOffset);
1510 let top = Math.max(e.pageY - hover.getBoundingClientRect().height, window.pageYOffset);
1511 left = Math.min(left, window.pageXOffset + document.documentElement.clientWidth - hover.getBoundingClientRect().width);
1513 hover.style.left = left + 'px';
1514 hover.style.top = top + 'px';
1517 function hide_hover(e, color) {
1518 e.target.style.fill = 'rgb(' + color[0]*100.0 + '%, ' + color[1]*100.0 + '%, ' + color[2]*100.0 + '%)';
1519 document.getElementById('sparklinehover').style.display = 'none';
1523 * @param {number} num_viewers
1525 function update_num_viewers(num_viewers) {
1527 if (num_viewers === null) {
1529 } else if (num_viewers == 1) {
1530 text = "You are the only current viewer";
1532 text = num_viewers + " current viewers";
1534 if (display_fen !== null) {
1535 let counter = Math.floor(display_fen.split(" ")[4] / 2);
1536 if (counter >= 20) {
1537 text = text.replace("current ", "");
1538 text += " | 50-move rule: " + counter;
1541 document.getElementById("numviewers").textContent = text;
1544 function update_clock() {
1547 let data = displayed_analysis_data || current_analysis_data;
1550 if (data['position']) {
1551 let result = data['position']['result'];
1552 if (result === '1-0') {
1553 document.getElementById("whiteclock").textContent = "1";
1554 document.getElementById("blackclock").textContent = "0";
1555 document.getElementById("whiteclock").classList.remove("running-clock");
1556 document.getElementById("blackclock").classList.remove("running-clock");
1559 if (result === '1/2-1/2') {
1560 document.getElementById("whiteclock").textContent = "1/2";
1561 document.getElementById("blackclock").textContent = "1/2";
1562 document.getElementById("whiteclock").classList.remove("running-clock");
1563 document.getElementById("blackclock").classList.remove("running-clock");
1566 if (result === '0-1') {
1567 document.getElementById("whiteclock").textContent = "0";
1568 document.getElementById("blackclock").textContent = "1";
1569 document.getElementById("whiteclock").classList.remove("running-clock");
1570 document.getElementById("blackclock").classList.remove("running-clock");
1575 let white_clock_ms = null;
1576 let black_clock_ms = null;
1579 if (data['position'] &&
1580 data['position']['white_clock'] &&
1581 data['position']['black_clock']) {
1582 white_clock_ms = data['position']['white_clock'] * 1000;
1583 black_clock_ms = data['position']['black_clock'] * 1000;
1586 // Dynamic clock (only one, obviously).
1588 if (data['position']['white_clock_target']) {
1590 document.getElementById("whiteclock").classList.add("running-clock");
1591 document.getElementById("blackclock").classList.remove("running-clock");
1592 } else if (data['position']['black_clock_target']) {
1594 document.getElementById("whiteclock").classList.remove("running-clock");
1595 document.getElementById("blackclock").classList.add("running-clock");
1597 document.getElementById("whiteclock").classList.remove("running-clock");
1598 document.getElementById("blackclock").classList.remove("running-clock");
1602 let now = new Date().getTime() + client_clock_offset_ms;
1603 remaining_ms = data['position'][color + '_clock_target'] * 1000 - now;
1604 if (color === "white") {
1605 white_clock_ms = remaining_ms;
1607 black_clock_ms = remaining_ms;
1611 if (white_clock_ms === null || black_clock_ms === null) {
1612 document.getElementById("whiteclock").replaceChildren();
1613 document.getElementById("blackclock").replaceChildren();
1617 // If either player has twenty minutes or less left, add the second counters.
1618 // This matches what DGT clocks do.
1619 let show_seconds = (white_clock_ms < 60 * 20 * 1000 || black_clock_ms < 60 * 20 * 1000);
1621 if (color && remaining_ms > 0) {
1622 // See when the clock will change next, and update right after that.
1625 next_update_ms = remaining_ms % 1000 + 100;
1627 next_update_ms = remaining_ms % 60000 + 100;
1629 clock_timer = setTimeout(update_clock, next_update_ms);
1632 document.getElementById("whiteclock").textContent = format_clock(white_clock_ms, show_seconds);
1633 document.getElementById("blackclock").textContent = format_clock(black_clock_ms, show_seconds);
1637 * @param {Number} remaining_ms
1638 * @param {boolean} show_seconds
1640 function format_clock(remaining_ms, show_seconds) {
1641 if (remaining_ms <= 0) {
1649 let remaining = Math.floor(remaining_ms / 1000);
1650 let seconds = remaining % 60;
1651 remaining = (remaining - seconds) / 60;
1652 let minutes = remaining % 60;
1653 remaining = (remaining - minutes) / 60;
1654 let hours = remaining;
1656 return format_2d(hours) + ":" + format_2d(minutes) + ":" + format_2d(seconds);
1658 return format_2d(hours) + ":" + format_2d(minutes);
1665 function format_2d(x) {
1674 * @param {string} move
1675 * @param {Number} move_num Move number of this move.
1676 * @param {boolean} white_to_play Whether white is to play this move.
1678 function format_move_with_number(move, move_num, white_to_play) {
1680 if (white_to_play) {
1681 ret = move_num + '. ';
1683 ret = move_num + '… ';
1690 * @param {string} move
1691 * @param {Number} halfmove_num Half-move number that is to be played,
1694 function format_halfmove_with_number(move, halfmove_num) {
1695 return format_move_with_number(
1697 Math.floor(halfmove_num / 2) + 1,
1698 halfmove_num % 2 == 0);
1702 * @param {Object} data
1703 * @param {Number} halfmove_num
1705 function format_tooltip(data, halfmove_num) {
1706 if (data['score_history'][halfmove_num + 1] ||
1707 (halfmove_num + 1) === data['position']['history'].length) {
1708 // Position is in the history, or it is the current position
1709 // (which is implicitly tacked onto the history).
1712 if ((halfmove_num + 1) === data['position']['history'].length) {
1713 move = data['position']['last_move'];
1714 short_score = format_short_score(data['score']);
1716 move = data['position']['history'][halfmove_num];
1717 short_score = format_short_score(data['score_history'][halfmove_num + 1]);
1719 if (halfmove_num === -1) {
1720 return "Start position: " + short_score;
1722 let move_with_number = format_halfmove_with_number(move, halfmove_num);
1723 return "After " + move_with_number + ": " + short_score;
1726 for (let i = halfmove_num; i --> -1; ) {
1727 if (data['score_history'][i]) {
1728 let move = data['position']['history'][i];
1730 return "[Analysis kept from start position]";
1732 return "[Analysis kept from " + format_halfmove_with_number(move, i) + "]";
1740 * @param {boolean} truncate_history
1742 function set_truncate_history(truncate_history) {
1743 truncate_display_history = truncate_history;
1744 update_refutation_lines();
1746 window['set_truncate_history'] = set_truncate_history;
1749 * @param {number} line_num
1750 * @param {number} move_num
1752 function show_line(line_num, move_num) {
1753 if (line_num == -1) {
1754 current_display_line = null;
1755 current_display_move = null;
1756 hash_refutation_lines = null;
1757 refutation_lines_base_fen = base_fen;
1758 if (displayed_analysis_data) {
1759 // TODO: Support exiting to history position if we are in an
1760 // analysis line of a history position.
1761 displayed_analysis_data = null;
1766 current_display_line = {...display_lines[line_num]}; // Shallow clone.
1767 current_display_move = move_num + current_display_line.start_display_move_num;
1769 current_display_line_is_history = (line_num == 0);
1771 update_historic_analysis();
1772 update_displayed_line();
1773 update_board_highlight();
1774 update_move_highlight();
1777 window['show_line'] = show_line;
1779 function prev_move() {
1780 if (current_display_line &&
1781 current_display_move >= current_display_line.start_display_move_num) {
1782 --current_display_move;
1784 update_historic_analysis();
1785 update_displayed_line();
1786 update_move_highlight();
1788 window['prev_move'] = prev_move;
1790 function next_move() {
1791 if (current_display_line &&
1792 current_display_move < current_display_line.pv.length - 1) {
1793 ++current_display_move;
1795 update_historic_analysis();
1796 update_displayed_line();
1797 update_move_highlight();
1799 window['next_move'] = next_move;
1801 function next_game() {
1802 if (current_games === null) {
1806 // Try to find the game we are currently looking at.
1807 for (let game_num = 0; game_num < current_games.length; ++game_num) {
1808 let game = current_games[game_num];
1809 if (game['url'] === backend_url) {
1810 let next_game_num = (game_num + 1) % current_games.length;
1811 switch_backend(current_games[next_game_num]);
1816 // Couldn't find it; give up.
1819 function update_historic_analysis() {
1820 if (!current_display_line_is_history) {
1823 if (current_display_move == current_display_line.pv.length - 1) {
1824 displayed_analysis_data = null;
1828 // Fetch old analysis for this line if it exists.
1829 let hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move);
1830 let filename = "/history/move" + (current_display_move + 1) + "-" +
1831 hiddenboard.fen().replace(/ /g, '_').replace(/\//g, '-') + ".json";
1833 let handle_err = () => {
1834 displayed_analysis_data = {'failed': true};
1838 current_historic_xhr = new AbortController();
1839 const signal = current_analysis_xhr.signal;
1840 fetch(filename, { signal })
1841 .then((response) => response.json().then(data => ({ok: response.ok, json: data}))) // ick
1847 displayed_analysis_data = obj.json;
1851 if (err.name === 'AbortError') {
1852 // Aborted because we are switching backends. Abandon and don't retry,
1853 // because another one is already started for us.
1862 * @param {string} fen
1864 function update_imbalance(fen) {
1865 let imbalance = {'k': 0, 'q': 0, 'r': 0, 'b': 0, 'n': 0, 'p': 0};
1866 for (const c of fen) {
1871 if (c != c.toUpperCase()) {
1873 } else if (c != c.toLowerCase()) {
1874 ++imbalance[c.toLowerCase()];
1878 let white_imbalance = document.getElementById('whiteimbalance');
1879 let black_imbalance = document.getElementById('blackimbalance');
1880 white_imbalance.textContent = '';
1881 black_imbalance.textContent = '';
1882 for (let piece in imbalance) {
1883 for (let i = 0; i < imbalance[piece]; ++i) {
1884 let i1 = document.createElement('img');
1885 i1.src = svg_pieces['w' + piece.toUpperCase()];
1886 i1.setAttribute('alt', piece.toUpperCase());
1887 i1.classList.add('imbalance-piece');
1888 white_imbalance.appendChild(i1);
1890 let i2 = document.createElement('img');
1891 i2.src = svg_pieces['b' + piece.toUpperCase()];
1892 i2.setAttribute('alt', piece.toUpperCase());
1893 i2.classList.add('imbalance-inverted-piece');
1894 white_imbalance.appendChild(i2);
1896 for (let i = 0; i < -imbalance[piece]; ++i) {
1897 let i1 = document.createElement('img');
1898 i1.src = svg_pieces['b' + piece.toUpperCase()];
1899 i1.setAttribute('alt', piece.toUpperCase());
1900 i1.classList.add('imbalance-piece');
1901 black_imbalance.appendChild(i1);
1903 let i2 = document.createElement('img');
1904 i2.src = svg_pieces['w' + piece.toUpperCase()];
1905 i2.setAttribute('alt', piece.toUpperCase());
1906 i2.classList.add('imbalance-inverted-piece');
1907 black_imbalance.appendChild(i2);
1912 /** Mark the currently selected move in red.
1913 * Also replaces the PV with the current displayed line if it's not shown
1914 * anywhere else on the screen.
1916 function update_move_highlight() {
1917 if (highlighted_move !== null) {
1918 highlighted_move.classList.remove('highlight');
1920 if (current_display_line) {
1921 let display_line_num = find_display_line_matching_num();
1922 if (display_line_num === null) {
1923 // Replace the PV with the (complete) line.
1924 document.getElementById("pvtitle").textContent = "Exploring:";
1925 current_display_line.start_display_move_num = 0;
1926 display_lines.push(current_display_line);
1927 document.getElementById("pv").replaceChildren(print_pv(display_lines.length - 1, null)); // FIXME
1928 display_line_num = display_lines.length - 1;
1930 // Clear out the PV, so it's not selected by anything later.
1931 display_lines[1].pv = [];
1934 highlighted_move = document.getElementById("automove" + display_line_num + "-" + (current_display_move - current_display_line.start_display_move_num));
1935 if (highlighted_move !== null) {
1936 highlighted_move.classList.add('highlight');
1942 * See if the current displayed line is identical to any of the ones
1943 * we have on screen. (It might not be if e.g. the analysis reloaded
1944 * since we started looking.)
1948 function find_display_line_matching_num() {
1949 for (let i = 0; i < display_lines.length; ++i) {
1950 let line = display_lines[i];
1951 if (line.start_display_move_num > 0) continue;
1952 if (current_display_line.start_fen !== line.start_fen) continue;
1953 if (current_display_line.pv.length !== line.pv.length) continue;
1955 for (let j = 0; j < line.pv.length; ++j) {
1956 if (current_display_line.pv[j] !== line.pv[j]) {
1968 /** Update the board based on the currently displayed line.
1970 * TODO: This should really be called only whenever something changes,
1971 * instead of all the time.
1973 function update_displayed_line() {
1974 if (current_display_line === null) {
1975 document.getElementById("linenav").style.display = 'none';
1976 document.getElementById("linemsg").style.display = 'revert';
1977 display_fen = base_fen;
1978 set_board_position(base_fen);
1979 update_imbalance(base_fen);
1983 document.getElementById("linenav").style.display = 'revert';
1984 document.getElementById("linemsg").style.display = 'none';
1986 if (current_display_move <= 0) {
1987 document.getElementById("prevmove").textContent = "Previous";
1989 document.getElementById("prevmove").innerHTML = "<a href=\"javascript:prev_move();\">Previous</a></span>";
1991 if (current_display_move == current_display_line.pv.length - 1) {
1992 document.getElementById("nextmove").textContent = "Next";
1994 document.getElementById("nextmove").innerHTML = "<a href=\"javascript:next_move();\">Next</a></span>";
1997 let hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move);
1998 set_board_position(hiddenboard.fen());
1999 if (display_fen !== hiddenboard.fen() && !current_display_line_is_history) {
2000 // Fire off a hash request, since we're now off the main position
2001 // and it just changed.
2002 explore_hash(hiddenboard.fen());
2004 display_fen = hiddenboard.fen();
2005 update_imbalance(hiddenboard.fen());
2008 function set_board_position(new_fen) {
2009 board_is_animating = true;
2010 let old_fen = board.fen();
2011 let animate = old_fen !== '8/8/8/8/8/8/8/';
2012 board.position(new_fen, animate);
2013 if (board.fen() === old_fen) {
2014 board_is_animating = false;
2019 * @param {boolean} param_enable_sound
2021 function set_sound(param_enable_sound) {
2022 enable_sound = param_enable_sound;
2024 document.getElementById("soundon").innerHTML = "<strong>On</strong>";
2025 document.getElementById("soundoff").innerHTML = "<a href=\"javascript:set_sound(false)\">Off</a>";
2027 // Seemingly at least Firefox prefers MP3 over Opus; tell it otherwise,
2028 // and also preload the file since the user has selected audio.
2029 let ding = document.getElementById('ding');
2030 if (ding && ding.canPlayType && ding.canPlayType('audio/ogg; codecs="opus"') === 'probably') {
2031 ding.src = 'ding.opus';
2035 document.getElementById("soundon").innerHTML = "<a href=\"javascript:set_sound(true)\">On</a>";
2036 document.getElementById("soundoff").innerHTML = "<strong>Off</strong>";
2038 if (supports_html5_storage()) {
2039 window['localStorage']['enable_sound'] = enable_sound ? 1 : 0;
2042 window['set_sound'] = set_sound;
2044 /** Send off a hash probe request to the backend.
2045 * @param {string} fen
2047 function explore_hash(fen) {
2048 // If we already have a backend response going, abort it.
2049 if (current_hash_xhr) {
2050 current_hash_xhr.abort();
2052 if (current_hash_display_timer) {
2053 clearTimeout(current_hash_display_timer);
2054 current_hash_display_timer = null;
2056 document.getElementById("refutationlines").replaceChildren();
2058 current_hash_xhr = new AbortController();
2059 const signal = current_analysis_xhr.signal;
2060 fetch(backend_hash_url + "?fen=" + fen, { signal })
2061 .then((response) => response.json())
2062 .then((data) => { show_explore_hash_results(data, fen); })
2064 // Truncate the lines, since we already cleared the display.
2065 display_lines = [ display_lines[0], display_lines[1] ];
2066 update_move_highlight();
2070 /** Process the JSON response from a hash probe request.
2071 * @param {!Object} data
2072 * @param {string} fen
2074 function show_explore_hash_results(data, fen) {
2075 if (board_is_animating) {
2076 // Updating while the animation is still going causes
2077 // the animation to jerk. This is pretty crude, but it will do.
2078 current_hash_display_timer = setTimeout(function() { show_explore_hash_results(data, fen); }, 100);
2081 current_hash_display_timer = null;
2082 hash_refutation_lines = data['lines'];
2083 refutation_lines_base_fen = fen;
2087 // almost all of this stuff comes from the chessboard.js example page
2088 function onDragStart(source, piece, position, orientation) {
2089 let pseudogame = new Chess(display_fen);
2090 if (pseudogame.game_over() === true ||
2091 (pseudogame.turn() === 'w' && piece.search(/^b/) !== -1) ||
2092 (pseudogame.turn() === 'b' && piece.search(/^w/) !== -1)) {
2096 recommended_move = get_best_move(pseudogame, source, null, pseudogame.turn() === 'b');
2097 if (recommended_move) {
2098 let squareEl = document.querySelector('#board .square-' + recommended_move.to);
2099 squareEl.classList.add('highlight1-32417');
2104 function mousedownSquare(e) {
2105 if (!e.target || !e.target.getAttribute('data-square')) {
2109 reverse_dragging_from = null;
2110 let square = e.target.getAttribute('data-square');
2112 let pseudogame = new Chess(display_fen);
2113 if (pseudogame.game_over() === true) {
2117 // If the square is empty, or has a piece of the side not to move,
2118 // we handle it. If not, normal piece dragging will take it.
2119 let position = board.position();
2120 if (!position.hasOwnProperty(square) ||
2121 (pseudogame.turn() === 'w' && position[square].search(/^b/) !== -1) ||
2122 (pseudogame.turn() === 'b' && position[square].search(/^w/) !== -1)) {
2123 reverse_dragging_from = square;
2124 recommended_move = get_best_move(pseudogame, null, square, pseudogame.turn() === 'b');
2125 if (recommended_move) {
2126 let squareEl = document.querySelector('#board .square-' + recommended_move.from);
2127 squareEl.classList.add('highlight1-32417');
2128 squareEl = document.querySelector('#board .square-' + recommended_move.to);
2129 squareEl.classList.add('highlight1-32417');
2134 function mouseupSquare(e) {
2135 if (!e.target || !e.target.getAttribute('data-square')) {
2138 if (reverse_dragging_from === null) {
2141 let source = e.target.getAttribute('data-square');
2142 let target = reverse_dragging_from;
2143 reverse_dragging_from = null;
2144 if (onDrop(source, target) !== 'snapback') {
2145 onSnapEnd(source, target);
2147 document.getElementById("board").querySelectorAll('.square-55d63.highlight1-32417').forEach((square) => {
2148 square.classList.remove('highlight1-32417');
2152 function get_best_move(game, source, target, invert) {
2153 let moves = game.moves({ verbose: true });
2154 if (source !== null) {
2155 moves = moves.filter(function(move) { return move.from == source; });
2157 if (target !== null) {
2158 moves = moves.filter(function(move) { return move.to == target; });
2160 if (moves.length == 0) {
2163 if (moves.length == 1) {
2167 // More than one move. Use the display lines (if we have them)
2168 // to disambiguate; otherwise, we have no information.
2170 for (let i = 0; i < moves.length; ++i) {
2171 move_hash[moves[i].san] = moves[i];
2174 // See if we're already exploring some line.
2175 if (current_display_line &&
2176 current_display_move < current_display_line.pv.length - 1) {
2177 let first_move = current_display_line.pv[current_display_move + 1];
2178 if (move_hash[first_move]) {
2179 return move_hash[first_move];
2183 // History and PV take priority over the display lines.
2184 for (let i = 0; i < 2; ++i) {
2185 let line = display_lines[i];
2186 let first_move = line.pv[line.start_display_move_num];
2187 if (move_hash[first_move]) {
2188 return move_hash[first_move];
2192 let best_move = null;
2193 let best_move_score = null;
2195 for (let move in refutation_lines) {
2196 let line = refutation_lines[move];
2197 if (!line['score']) {
2200 let first_move = line['pv'][0];
2201 if (move_hash[first_move]) {
2202 let score = compute_score_sort_key(line['score'], line['depth'], invert);
2203 if (best_move_score === null || score > best_move_score) {
2204 best_move = move_hash[first_move];
2205 best_move_score = score;
2212 function onDrop(source, target) {
2213 if (source === target) {
2214 if (recommended_move === null) {
2217 // Accept the move. It will be changed in onSnapEnd.
2221 // Suggestion not asked for.
2222 recommended_move = null;
2225 // see if the move is legal
2226 let pseudogame = new Chess(display_fen);
2227 let move = pseudogame.move({
2230 promotion: 'q' // NOTE: always promote to a queen for example simplicity
2234 if (move === null) return 'snapback';
2238 * If we are in admin mode, send this move to the backend.
2240 * @param {string} fen
2241 * @param {string} move
2243 function send_chosen_move(fen, move) {
2244 if (admin_password !== null) {
2245 let history = current_analysis_data['position']['history'];
2246 let url = '/manual-override.pl';
2247 url += '?fen=' + encodeURIComponent(fen);
2248 url += '&history=' + encodeURIComponent(JSON.stringify(history));
2249 url += '&move=' + encodeURIComponent(move);
2250 url += '&player_w=' + encodeURIComponent(current_analysis_data['position']['player_w']);
2251 url += '&player_b=' + encodeURIComponent(current_analysis_data['position']['player_b']);
2252 url += '&password=' + encodeURIComponent(admin_password);
2254 console.log(fen, history);
2255 fetch(url); // Ignore the result.
2259 function onSnapEnd(source, target) {
2260 if (source === target && recommended_move !== null) {
2261 source = recommended_move.from;
2262 target = recommended_move.to;
2264 recommended_move = null;
2265 let pseudogame = new Chess(display_fen);
2266 let move = pseudogame.move({
2269 promotion: 'q' // NOTE: always promote to a queen for example simplicity
2272 if (admin_password !== null) {
2273 send_chosen_move(display_fen, move.san);
2277 // Move ahead on the line we're on -- this includes history if we've
2279 if (current_display_line &&
2280 current_display_move < current_display_line.pv.length - 1 &&
2281 current_display_line.pv[current_display_move + 1] === move.san) {
2286 // Walk down the displayed lines until we find one that starts with
2287 // this move, then select that. Note that this gives us a good priority
2288 // order (PV, then multi-PV lines; history was already dealt with above,
2289 // as it's the only line that originates backwards).
2290 for (let i = 1; i < display_lines.length; ++i) {
2291 if (i == 1 && current_display_line) {
2292 // Do not choose PV if not on it.
2295 let line = display_lines[i];
2296 if (line.pv[line.start_display_move_num] === move.san) {
2302 // Shouldn't really be here if we have hash probes, but there's really
2303 // nothing we can do.
2304 // FIXME: Just make a new line, probably (even if we don't have hash moves).
2305 // As it is, we can actually drag (but not click) such a move in the UI,
2306 // but it has no effect on what we're probing.
2308 // End of dragging-related code.
2310 function fmt_cp(v) {
2314 return "+" + (v / 100).toFixed(2);
2317 return "-" + (v / 100).toFixed(2);
2321 function format_short_score(score) {
2325 if (score[0] === 'T' || score[0] === 't') {
2326 let ret = "TB\u00a0";
2327 if (score[2]) { // Is a bound.
2328 ret = score[2] + "\u00a0TB\u00a0";
2330 if (score[0] === 'T') {
2331 return ret + Math.ceil(score[1] / 2);
2333 return ret + "-" + Math.ceil(score[1] / 2);
2335 } else if (score[0] === 'M' || score[0] === 'm') {
2336 let sign = (score[0] === 'm') ? '-' : '';
2337 if (score[2]) { // Is a bound.
2338 return score[2] + "\u00a0M " + sign + score[1];
2340 return "M " + sign + score[1];
2342 } else if (score[0] === 'd') {
2344 } else if (score[0] === 'cp') {
2345 if (score[2]) { // Is a bound.
2346 return score[2] + "\u00a0" + fmt_cp(score[1]);
2348 return fmt_cp(score[1]);
2354 function format_long_score(score) {
2358 if (score[0] === 'T') {
2359 if (score[1] == 0) {
2360 return "Won for white (tablebase)";
2362 return "White wins in " + Math.ceil(score[1] / 2);
2364 } else if (score[0] === 't') {
2365 if (score[1] == -1) {
2366 return "Won for black (tablebase)";
2368 return "Black wins in " + Math.ceil(score[1] / 2);
2370 } else if (score[0] === 'M') {
2371 if (score[1] == 0) {
2372 return "White wins by checkmate";
2374 return "White mates in " + score[1];
2376 } else if (score[0] === 'm') {
2377 if (score[1] == 0) {
2378 return "Black wins by checkmate";
2380 return "Black mates in " + score[1];
2382 } else if (score[0] === 'd') {
2383 return "Theoretical draw";
2384 } else if (score[0] === 'cp') {
2385 return "Score: " + format_short_score(score);
2390 function compute_plot_score(score) {
2391 if (score[0] === 'M' || score[0] === 'T') {
2393 } else if (score[0] === 'm' || score[0] === 't') {
2395 } else if (score[0] === 'd') {
2397 } else if (score[0] === 'cp') {
2398 if (score[1] > 500) {
2400 } else if (score[1] < -500) {
2410 * @param score The score digest tuple.
2411 * @param {?number} depth Depth the move has been computed to, or null.
2412 * @param {boolean} invert Whether black is to play.
2415 function compute_score_sort_key(score, depth, invert) {
2420 if (score[0] === 'T') {
2421 // White reaches TB win.
2422 s = 89999 - score[1];
2423 } else if (score[0] === 't') {
2424 // Black reaches TB win.
2425 s = -(89999 - score[1]);
2426 } else if (score[0] === 'M') {
2428 s = 99999 - score[1];
2429 } else if (score[0] === 'm') {
2431 s = -(99999 - score[1]);
2432 } else if (score[0] === 'd') {
2434 } else if (score[0] === 'cp') {
2446 * @param {Object} game
2448 function switch_backend(game) {
2449 // Stop looking at historic data.
2450 current_display_line = null;
2451 current_display_move = null;
2452 displayed_analysis_data = null;
2453 if (current_historic_xhr) {
2454 current_historic_xhr.abort();
2457 // If we already have a backend response going, abort it.
2458 if (current_analysis_xhr) {
2459 current_analysis_xhr.abort();
2461 if (current_hash_xhr) {
2462 current_hash_xhr.abort();
2465 // Otherwise, we should have a timer going to start a new one.
2467 if (current_analysis_request_timer) {
2468 clearTimeout(current_analysis_request_timer);
2469 current_analysis_request_timer = null;
2471 if (current_hash_display_timer) {
2472 clearTimeout(current_hash_display_timer);
2473 current_hash_display_timer = null;
2476 // Request an immediate fetch with the new backend.
2477 backend_url = game['url'];
2478 backend_hash_url = game['hashurl'];
2479 window.location.hash = '#' + game['id'];
2480 current_analysis_data = null;
2484 window['switch_backend'] = switch_backend;
2486 window['flip'] = function() { board.flip(); redraw_arrows(); };
2487 window['set_delay_ms'] = function(ms) { delay_ms = ms; console.log('Delay is now ' + ms + ' ms.'); };
2489 // Mostly from Wikipedia's chess set as of October 2022, but some pieces are from
2490 // the 2013 version, as I like those better (and it matches the 2014 PNGs; nobody
2491 // really likes change, do they?). That is wK, bK, bQ. wQ is also slightly different,
2492 // but not enough to notice.
2493 const svg_pieces = {
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2499 'wP': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 width=%2245%22 height=%2245%22><path d=%22m 22.5,9 c -2.21,0 -4,1.79 -4,4 0,0.89 0.29,1.71 0.78,2.38 C 17.33,16.5 16,18.59 16,21 c 0,2.03 0.94,3.84 2.41,5.03 C 15.41,27.09 11,31.58 11,39.5 H 34 C 34,31.58 29.59,27.09 26.59,26.03 28.06,24.84 29,23.03 29,21 29,18.59 27.67,16.5 25.72,15.38 26.21,14.71 26.5,13.89 26.5,13 c 0,-2.21 -1.79,-4 -4,-4 z%22 style=%22opacity:1;fill:%23ffffff;fill-opacity:1;fill-rule:nonzero;stroke:%23000000;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22/></svg>',
2500 'bK': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 width=%2245%22 height=%2245%22><g style=%22fill:none;fill-opacity:1;fill-rule:evenodd;stroke:%23000000;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22><path d=%22M 22.5,11.63 L 22.5,6%22 style=%22fill:none;stroke:%23000000;stroke-linejoin:miter%22 id=%22path6570%22/><path d=%22M 22.5,25 C 22.5,25 27,17.5 25.5,14.5 C 25.5,14.5 24.5,12 22.5,12 C 20.5,12 19.5,14.5 19.5,14.5 C 18,17.5 22.5,25 22.5,25%22 style=%22fill:%23000000;fill-opacity:1;stroke-linecap:butt;stroke-linejoin:miter%22/><path d=%22M 11.5,37 C 17,40.5 27,40.5 32.5,37 L 32.5,30 C 32.5,30 41.5,25.5 38.5,19.5 C 34.5,13 25,16 22.5,23.5 L 22.5,27 L 22.5,23.5 C 19,16 9.5,13 6.5,19.5 C 3.5,25.5 11.5,29.5 11.5,29.5 L 11.5,37 z %22 style=%22fill:%23000000;stroke:%23000000%22/><path d=%22M 20,8 L 25,8%22 style=%22fill:none;stroke:%23000000;stroke-linejoin:miter%22/><path d=%22M 32,29.5 C 32,29.5 40.5,25.5 38.03,19.85 C 34.15,14 25,18 22.5,24.5 L 22.51,26.6 L 22.5,24.5 C 20,18 9.906,14 6.997,19.85 C 4.5,25.5 11.85,28.85 11.85,28.85%22 style=%22fill:none;stroke:%23ffffff%22/><path d=%22M 11.5,30 C 17,27 27,27 32.5,30 M 11.5,33.5 C 17,30.5 27,30.5 32.5,33.5 M 11.5,37 C 17,34 27,34 32.5,37%22 style=%22fill:none;stroke:%23ffffff%22/></g></svg>',
2501 'bQ': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns:svg=%22http://www.w3.org/2000/svg%22 xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 width=%2245%22 height=%2245%22 id=%22svg3128%22><defs/><g id=%22layer1%22><path d=%22M 8 12 A 2 2 0 1 1 4,12 A 2 2 0 1 1 8 12 z%22 style=%22opacity:1;fill:%23000000;fill-opacity:1;stroke:%23000000;stroke-width:1;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22 id=%22path5571%22/><path d=%22M 9 13 A 2 2 0 1 1 5,13 A 2 2 0 1 1 9 13 z%22 transform=%22translate(15.5,-5.5)%22 style=%22opacity:1;fill:%23000000;fill-opacity:1;stroke:%23000000;stroke-width:1;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22 id=%22path5573%22/><path d=%22M 9 13 A 2 2 0 1 1 5,13 A 2 2 0 1 1 9 13 z%22 transform=%22translate(32,-1)%22 style=%22opacity:1;fill:%23000000;fill-opacity:1;stroke:%23000000;stroke-width:1;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22 id=%22path5575%22/><path d=%22M 9 13 A 2 2 0 1 1 5,13 A 2 2 0 1 1 9 13 z%22 transform=%22translate(7,-4.5)%22 style=%22opacity:1;fill:%23000000;fill-opacity:1;stroke:%23000000;stroke-width:1;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22 id=%22path5577%22/><path d=%22M 9 13 A 2 2 0 1 1 5,13 A 2 2 0 1 1 9 13 z%22 transform=%22translate(24,-4)%22 style=%22opacity:1;fill:%23000000;fill-opacity:1;stroke:%23000000;stroke-width:1;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22 id=%22path5579%22/><path d=%22M 9,26 C 17.5,24.5 30,24.5 36,26 L 38,14 L 31,25 L 31,11 L 25.5,24.5 L 22.5,9.5 L 19.5,24.5 L 14,10.5 L 14,25 L 7,14 L 9,26 z %22 style=%22fill:%23000000;fill-opacity:1;fill-rule:evenodd;stroke:%23000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:round;stroke-opacity:1%22 id=%22path5581%22/><path d=%22M 9,26 C 9,28 10.5,28 11.5,30 C 12.5,31.5 12.5,31 12,33.5 C 10.5,34.5 10.5,36 10.5,36 C 9,37.5 11,38.5 11,38.5 C 17.5,39.5 27.5,39.5 34,38.5 C 34,38.5 35.5,37.5 34,36 C 34,36 34.5,34.5 33,33.5 C 32.5,31 32.5,31.5 33.5,30 C 34.5,28 36,28 36,26 C 27.5,24.5 17.5,24.5 9,26 z %22 style=%22fill:%23000000;fill-opacity:1;fill-rule:evenodd;stroke:%23000000;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:round;stroke-opacity:1%22 id=%22path5583%22/><path d=%22M 11.5,30 C 15,29 30,29 33.5,30%22 style=%22fill:none;fill-opacity:0.75;fill-rule:evenodd;stroke:%23ffffff;stroke-width:1px;stroke-linecap:round;stroke-linejoin:round;stroke-opacity:1%22 id=%22path5585%22/><path d=%22M 12,33.5 C 18,32.5 27,32.5 33,33.5%22 style=%22fill:none;fill-opacity:0.75;fill-rule:evenodd;stroke:%23ffffff;stroke-width:1px;stroke-linecap:round;stroke-linejoin:round;stroke-opacity:1%22 id=%22path5587%22/><path d=%22M 10.5,36 C 15.5,35 29,35 34,36%22 style=%22fill:none;fill-opacity:0.75;fill-rule:evenodd;stroke:%23ffffff;stroke-width:1px;stroke-linecap:round;stroke-linejoin:round;stroke-opacity:1%22 id=%22path5589%22/></g></svg>',
2502 'bR': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 width=%2245%22 height=%2245%22><g style=%22opacity:1;fill:%23000000;fill-opacity:1;fill-rule:evenodd;stroke:%23000000;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22 transform=%22translate(0,0.3)%22><path d=%22M 9,39 L 36,39 L 36,36 L 9,36 L 9,39 z %22 style=%22stroke-linecap:butt%22/><path d=%22M 12.5,32 L 14,29.5 L 31,29.5 L 32.5,32 L 12.5,32 z %22 style=%22stroke-linecap:butt%22/><path d=%22M 12,36 L 12,32 L 33,32 L 33,36 L 12,36 z %22 style=%22stroke-linecap:butt%22/><path d=%22M 14,29.5 L 14,16.5 L 31,16.5 L 31,29.5 L 14,29.5 z %22 style=%22stroke-linecap:butt;stroke-linejoin:miter%22/><path d=%22M 14,16.5 L 11,14 L 34,14 L 31,16.5 L 14,16.5 z %22 style=%22stroke-linecap:butt%22/><path d=%22M 11,14 L 11,9 L 15,9 L 15,11 L 20,11 L 20,9 L 25,9 L 25,11 L 30,11 L 30,9 L 34,9 L 34,14 L 11,14 z %22 style=%22stroke-linecap:butt%22/><path d=%22M 12,35.5 L 33,35.5 L 33,35.5%22 style=%22fill:none;stroke:%23ffffff;stroke-width:1;stroke-linejoin:miter%22/><path d=%22M 13,31.5 L 32,31.5%22 style=%22fill:none;stroke:%23ffffff;stroke-width:1;stroke-linejoin:miter%22/><path d=%22M 14,29.5 L 31,29.5%22 style=%22fill:none;stroke:%23ffffff;stroke-width:1;stroke-linejoin:miter%22/><path d=%22M 14,16.5 L 31,16.5%22 style=%22fill:none;stroke:%23ffffff;stroke-width:1;stroke-linejoin:miter%22/><path d=%22M 11,14 L 34,14%22 style=%22fill:none;stroke:%23ffffff;stroke-width:1;stroke-linejoin:miter%22/></g></svg>',
2503 'bB': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 width=%2245%22 height=%2245%22><g style=%22opacity:1;fill:none;fill-rule:evenodd;fill-opacity:1;stroke:%23000000;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22 transform=%22translate(0,0.6)%22><g style=%22fill:%23000000;stroke:%23000000;stroke-linecap:butt%22><path d=%22M 9,36 C 12.39,35.03 19.11,36.43 22.5,34 C 25.89,36.43 32.61,35.03 36,36 C 36,36 37.65,36.54 39,38 C 38.32,38.97 37.35,38.99 36,38.5 C 32.61,37.53 25.89,38.96 22.5,37.5 C 19.11,38.96 12.39,37.53 9,38.5 C 7.65,38.99 6.68,38.97 6,38 C 7.35,36.54 9,36 9,36 z%22/><path d=%22M 15,32 C 17.5,34.5 27.5,34.5 30,32 C 30.5,30.5 30,30 30,30 C 30,27.5 27.5,26 27.5,26 C 33,24.5 33.5,14.5 22.5,10.5 C 11.5,14.5 12,24.5 17.5,26 C 17.5,26 15,27.5 15,30 C 15,30 14.5,30.5 15,32 z%22/><path d=%22M 25 8 A 2.5 2.5 0 1 1 20,8 A 2.5 2.5 0 1 1 25 8 z%22/></g><path d=%22M 17.5,26 L 27.5,26 M 15,30 L 30,30 M 22.5,15.5 L 22.5,20.5 M 20,18 L 25,18%22 style=%22fill:none;stroke:%23ffffff;stroke-linejoin:miter%22/></g></svg>',
2504 'bN': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 width=%2245%22 height=%2245%22><g style=%22opacity:1;fill:none;fill-opacity:1;fill-rule:evenodd;stroke:%23000000;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22 transform=%22translate(0,0.3)%22><path d=%22M 22,10 C 32.5,11 38.5,18 38,39 L 15,39 C 15,30 25,32.5 23,18%22 style=%22fill:%23000000;stroke:%23000000%22/><path d=%22M 24,18 C 24.38,20.91 18.45,25.37 16,27 C 13,29 13.18,31.34 11,31 C 9.958,30.06 12.41,27.96 11,28 C 10,28 11.19,29.23 10,30 C 9,30 5.997,31 6,26 C 6,24 12,14 12,14 C 12,14 13.89,12.1 14,10.5 C 13.27,9.506 13.5,8.5 13.5,7.5 C 14.5,6.5 16.5,10 16.5,10 L 18.5,10 C 18.5,10 19.28,8.008 21,7 C 22,7 22,10 22,10%22 style=%22fill:%23000000;stroke:%23000000%22/><path d=%22M 9.5 25.5 A 0.5 0.5 0 1 1 8.5,25.5 A 0.5 0.5 0 1 1 9.5 25.5 z%22 style=%22fill:%23ffffff;stroke:%23ffffff%22/><path d=%22M 15 15.5 A 0.5 1.5 0 1 1 14,15.5 A 0.5 1.5 0 1 1 15 15.5 z%22 transform=%22matrix(0.866,0.5,-0.5,0.866,9.693,-5.173)%22 style=%22fill:%23ffffff;stroke:%23ffffff%22/><path d=%22M 24.55,10.4 L 24.1,11.85 L 24.6,12 C 27.75,13 30.25,14.49 32.5,18.75 C 34.75,23.01 35.75,29.06 35.25,39 L 35.2,39.5 L 37.45,39.5 L 37.5,39 C 38,28.94 36.62,22.15 34.25,17.66 C 31.88,13.17 28.46,11.02 25.06,10.5 L 24.55,10.4 z %22 style=%22fill:%23ffffff;stroke:none%22/></g></svg>',
2505 'bP': 'data:image/svg+xml,<?xml version=%221.0%22 encoding=%22UTF-8%22 standalone=%22no%22?>%0A<!DOCTYPE svg PUBLIC %22-//W3C//DTD SVG 1.1//EN%22 %22http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd%22>%0A<svg xmlns=%22http://www.w3.org/2000/svg%22 version=%221.1%22 width=%2245%22 height=%2245%22><path d=%22m 22.5,9 c -2.21,0 -4,1.79 -4,4 0,0.89 0.29,1.71 0.78,2.38 C 17.33,16.5 16,18.59 16,21 c 0,2.03 0.94,3.84 2.41,5.03 C 15.41,27.09 11,31.58 11,39.5 H 34 C 34,31.58 29.59,27.09 26.59,26.03 28.06,24.84 29,23.03 29,21 29,18.59 27.67,16.5 25.72,15.38 26.21,14.71 26.5,13.89 26.5,13 c 0,-2.21 -1.79,-4 -4,-4 z%22 style=%22opacity:1;fill:%23000000;fill-opacity:1;fill-rule:nonzero;stroke:%23000000;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1%22/></svg>',
2508 function svg_piece_theme(piece) {
2509 return svg_pieces[piece];
2513 unique = get_unique();
2515 // Load settings from HTML5 local storage if available.
2516 if (supports_html5_storage() && window['localStorage']['enable_sound']) {
2517 set_sound(parseInt(window['localStorage']['enable_sound']));
2522 let admin_match = window.location.href.match(/\?password=([a-zA-Z0-9_-]+)/);
2523 if (admin_match !== null) {
2524 admin_password = admin_match[1];
2528 board = new window.ChessBoard('board', {
2529 onMoveEnd: function() { board_is_animating = false; },
2532 pieceTheme: svg_piece_theme,
2533 onDragStart: onDragStart,
2535 onSnapEnd: onSnapEnd
2537 document.getElementById("board").addEventListener('mousedown', mousedownSquare);
2538 document.getElementById("board").addEventListener('mouseup', mouseupSquare);
2540 if (window['inline_json']) {
2541 let j = window['inline_json'];
2542 process_update_response(j['data'], { 'get': (h) => j['headers'][h] });
2543 delete window['inline_json'];
2546 window.addEventListener('resize', function() {
2548 update_sparkline(displayed_analysis_data || current_analysis_data);
2549 update_board_highlight();
2552 new ResizeObserver(() => update_sparkline(displayed_analysis_data || current_analysis_data)).observe(document.getElementById('scoresparkcontainer'));
2553 window.addEventListener('keyup', function(event) {
2554 if (event.which == 39) { // Left arrow.
2556 } else if (event.which == 37) { // Right arrow.
2558 } else if (event.which >= 49 && event.which <= 57) { // 1-9.
2559 let num = event.which - 49;
2560 if (current_games && current_games.length >= num) {
2561 switch_backend(current_games[num]);
2563 } else if (event.which == 78) { // N.
2567 window.addEventListener('hashchange', possibly_switch_game_from_hash, false);
2568 possibly_switch_game_from_hash();
2570 document.addEventListener('DOMContentLoaded', init);