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.
196 * @type {?AbortController}
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.
213 * @type {?AbortController}
216 var current_historic_xhr = null;
219 * The current backend request to get hash probes, if any, so that we can abort it.
221 * @type {?AbortController}
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 let handle_err = () => {
261 // Backend error or similar. Wait ten seconds, then try again.
262 current_analysis_request_timer = setTimeout(function() { request_update(); }, 10000);
265 current_analysis_xhr = new AbortController();
266 const signal = current_analysis_xhr.signal;
267 fetch(backend_url + "?ims=" + ims + "&unique=" + unique, { signal })
268 .then((response) => response.json().then(data => ({ok: response.ok, headers: response.headers, json: data}))) // ick
275 if (delay_ms === 0) {
276 process_update_response(obj.json, obj.headers);
278 setTimeout(function() { process_update_response(obj.json, obj.headers); }, delay_ms);
282 if (!backend_url.match(/history/)) {
284 current_analysis_request_timer = setTimeout(function() { request_update(); }, timeout);
288 if (err.name === 'AbortError') {
289 // Aborted because we are switching backends. Abandon and don't retry,
290 // because another one is already started for us.
297 document.body.style.opacity = null;
302 var process_update_response = function(data, headers) {
303 sync_server_clock(headers.get('Date'));
304 ims = headers.get('X-RGLM');
305 var num_viewers = headers.get('X-RGNV');
307 if (Array.isArray(data)) {
308 new_data = JSON.parse(JSON.stringify(current_analysis_data));
309 JSON_delta.patch(new_data, data);
314 var minimum_version = headers.get('X-RGMV');
315 if (minimum_version && minimum_version > SCRIPT_VERSION) {
316 // Upgrade to latest version with a force-reload.
317 location.reload(true);
320 // Verify that the PV makes sense.
322 if (new_data['pv']) {
323 var hiddenboard = new Chess(new_data['position']['fen']);
324 for (var i = 0; i < new_data['pv'].length; ++i) {
325 if (hiddenboard.move(new_data['pv'][i]) === null) {
333 possibly_play_sound(current_analysis_data, new_data);
334 current_analysis_data = new_data;
336 update_num_viewers(num_viewers);
338 console.log("Received invalid update, waiting five seconds and trying again.");
339 setTimeout(function() { location.reload(true); }, 5000);
343 var possibly_play_sound = function(old_data, new_data) {
347 if (old_data === null) {
350 var ding = document.getElementById('ding');
351 if (ding && ding.play) {
352 if (old_data['position'] && old_data['position']['fen'] &&
353 new_data['position'] && new_data['position']['fen'] &&
354 (old_data['position']['fen'] !== new_data['position']['fen'] ||
355 old_data['position']['move_num'] !== new_data['position']['move_num'])) {
362 * @type {!string} server_date_string
364 var sync_server_clock = function(server_date_string) {
365 var server_time_ms = new Date(server_date_string).getTime();
366 var client_time_ms = new Date().getTime();
367 var estimated_offset_ms = server_time_ms - client_time_ms;
369 // In order not to let the noise move us too much back and forth
370 // (the server only has one-second resolution anyway), we only
371 // change an existing skew if we are at least five seconds off.
372 if (client_clock_offset_ms === null ||
373 Math.abs(estimated_offset_ms - client_clock_offset_ms) > 5000) {
374 client_clock_offset_ms = estimated_offset_ms;
378 var clear_arrows = function() {
379 for (var i = 0; i < arrows.length; ++i) {
381 if (arrows[i].svg.parentElement) {
382 arrows[i].svg.parentElement.removeChild(arrows[i].svg);
384 delete arrows[i].svg;
389 occupied_by_arrows = [];
390 for (var y = 0; y < 8; ++y) {
391 occupied_by_arrows.push([false, false, false, false, false, false, false, false]);
395 var redraw_arrows = function() {
396 for (var i = 0; i < arrows.length; ++i) {
397 position_arrow(arrows[i]);
401 /** @param {!number} x
404 var sign = function(x) {
414 /** See if drawing this arrow on the board would cause unduly amount of confusion.
415 * @param {!string} from The square the arrow is from (e.g. e4).
416 * @param {!string} to The square the arrow is to (e.g. e4).
419 var interfering_arrow = function(from, to) {
420 var from_col = from.charCodeAt(0) - "a1".charCodeAt(0);
421 var from_row = from.charCodeAt(1) - "a1".charCodeAt(1);
422 var to_col = to.charCodeAt(0) - "a1".charCodeAt(0);
423 var to_row = to.charCodeAt(1) - "a1".charCodeAt(1);
425 occupied_by_arrows[from_row][from_col] = true;
427 // Knight move: Just check that we haven't been at the destination before.
428 if ((Math.abs(to_col - from_col) == 2 && Math.abs(to_row - from_row) == 1) ||
429 (Math.abs(to_col - from_col) == 1 && Math.abs(to_row - from_row) == 2)) {
430 return occupied_by_arrows[to_row][to_col];
433 // Sliding piece: Check if anything except the from-square is seen before.
434 var dx = sign(to_col - from_col);
435 var dy = sign(to_row - from_row);
441 if (occupied_by_arrows[y][x]) {
444 occupied_by_arrows[y][x] = true;
445 } while (x != to_col || y != to_row);
450 /** Find a point along the coordinate system given by the given line,
451 * <t> units forward from the start of the line, <u> units to the right of it.
452 * @param {!number} x1
453 * @param {!number} x2
454 * @param {!number} y1
455 * @param {!number} y2
458 * @return {!string} The point in "x y" form, suitable for SVG paths.
460 var point_from_start = function(x1, y1, x2, y2, t, u) {
464 var norm = 1.0 / Math.sqrt(dx * dx + dy * dy);
468 var x = x1 + dx * t + dy * u;
469 var y = y1 + dy * t - dx * u;
473 /** Find a point along the coordinate system given by the given line,
474 * <t> units forward from the end of the line, <u> units to the right of it.
475 * @param {!number} x1
476 * @param {!number} x2
477 * @param {!number} y1
478 * @param {!number} y2
481 * @return {!string} The point in "x y" form, suitable for SVG paths.
483 var point_from_end = function(x1, y1, x2, y2, t, u) {
487 var norm = 1.0 / Math.sqrt(dx * dx + dy * dy);
491 var x = x2 + dx * t + dy * u;
492 var y = y2 + dy * t - dx * u;
496 var position_arrow = function(arrow) {
498 if (arrow.svg.parentElement) {
499 arrow.svg.parentElement.removeChild(arrow.svg);
503 if (current_display_line !== null && !current_display_line_is_history) {
507 var zoom_factor = $("#board").width() / 400.0;
508 var line_width = arrow.line_width * zoom_factor;
509 var arrow_size = arrow.arrow_size * zoom_factor;
511 var square_width = $(".square-a8").width();
512 var pos, from_y, to_y, from_x, to_x;
513 if (board.orientation() === 'black') {
514 pos = $(".square-h1").position();
515 from_y = (arrow.from_row + 0.5)*square_width;
516 to_y = (arrow.to_row + 0.5)*square_width;
517 from_x = (7 - arrow.from_col + 0.5)*square_width;
518 to_x = (7 - arrow.to_col + 0.5)*square_width;
520 pos = $(".square-a8").position();
521 from_y = (7 - arrow.from_row + 0.5)*square_width;
522 to_y = (7 - arrow.to_row + 0.5)*square_width;
523 from_x = (arrow.from_col + 0.5)*square_width;
524 to_x = (arrow.to_col + 0.5)*square_width;
527 var SVG_NS = "http://www.w3.org/2000/svg";
528 var XHTML_NS = "http://www.w3.org/1999/xhtml";
529 var svg = document.createElementNS(SVG_NS, "svg");
530 svg.setAttribute("width", /** @type{number} */ ($("#board").width()));
531 svg.setAttribute("height", /** @type{number} */ ($("#board").height()));
532 svg.setAttribute("style", "position: absolute");
533 svg.setAttribute("position", "absolute");
534 svg.setAttribute("version", "1.1");
535 svg.setAttribute("class", "c1");
536 svg.setAttribute("xmlns", XHTML_NS);
544 var outline = document.createElementNS(SVG_NS, "path");
545 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));
546 outline.setAttribute("xmlns", XHTML_NS);
547 outline.setAttribute("stroke", "#666");
548 outline.setAttribute("stroke-width", line_width + 2);
549 outline.setAttribute("fill", "none");
550 svg.appendChild(outline);
552 var path = document.createElementNS(SVG_NS, "path");
553 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));
554 path.setAttribute("xmlns", XHTML_NS);
555 path.setAttribute("stroke", arrow.fg_color);
556 path.setAttribute("stroke-width", line_width);
557 path.setAttribute("fill", "none");
558 svg.appendChild(path);
560 // Then the arrow head.
561 var head = document.createElementNS(SVG_NS, "path");
562 head.setAttribute("d",
563 "M " + point_from_end(x1, y1, x2, y2, 0, 0) +
564 " L " + point_from_end(x1, y1, x2, y2, -arrow_size, -arrow_size / 2) +
565 " L " + point_from_end(x1, y1, x2, y2, -arrow_size * .623, 0.0) +
566 " L " + point_from_end(x1, y1, x2, y2, -arrow_size, arrow_size / 2) +
567 " L " + point_from_end(x1, y1, x2, y2, 0, 0));
568 head.setAttribute("xmlns", XHTML_NS);
569 head.setAttribute("stroke", "#000");
570 head.setAttribute("stroke-width", "1");
571 head.setAttribute("fill", arrow.fg_color);
572 svg.appendChild(head);
574 $(svg).css({ top: pos.top, left: pos.left, 'pointer-events': 'none' });
575 document.body.appendChild(svg);
580 * @param {!string} from_square
581 * @param {!string} to_square
582 * @param {!string} fg_color
583 * @param {number} line_width
584 * @param {number} arrow_size
586 var create_arrow = function(from_square, to_square, fg_color, line_width, arrow_size) {
587 var from_col = from_square.charCodeAt(0) - "a1".charCodeAt(0);
588 var from_row = from_square.charCodeAt(1) - "a1".charCodeAt(1);
589 var to_col = to_square.charCodeAt(0) - "a1".charCodeAt(0);
590 var to_row = to_square.charCodeAt(1) - "a1".charCodeAt(1);
598 line_width: line_width,
599 arrow_size: arrow_size,
603 position_arrow(arrow);
607 var compare_by_score = function(refutation_lines, invert, a, b) {
608 var sa = compute_score_sort_key(refutation_lines[b]['score'], refutation_lines[b]['depth'], invert);
609 var sb = compute_score_sort_key(refutation_lines[a]['score'], refutation_lines[a]['depth'], invert);
614 * Fake multi-PV using the refutation lines. Find all “relevant” moves,
615 * sorted by quality, descending.
617 * @param {!Object} data
618 * @param {number} margin The maximum number of centipawns worse than the
619 * best move can be and still be included.
620 * @param {boolean} invert Whether black is to play.
621 * @return {Array.<string>} The FEN representation (e.g. Ne4) of all
622 * moves, in score order.
624 var find_nonstupid_moves = function(data, margin, invert) {
625 // First of all, if there are any moves that are more than 0.5 ahead of
626 // the primary move, the refutation lines are probably bunk, so just
628 var best_score = undefined;
629 var pv_score = undefined;
630 for (var move in data['refutation_lines']) {
631 var line = data['refutation_lines'][move];
632 var score = compute_score_sort_key(line['score'], line['depth'], invert, false);
633 if (move == data['pv'][0]) {
636 if (best_score === undefined || score > best_score) {
639 if (line['depth'] < 8) {
644 if (best_score - pv_score > 50) {
648 // Now find all moves that are within “margin” of the best score.
649 // The PV move will always be first.
651 for (var move in data['refutation_lines']) {
652 var line = data['refutation_lines'][move];
653 var score = compute_score_sort_key(line['score'], line['depth'], invert);
654 if (move != data['pv'][0] && best_score - score <= margin) {
658 moves = moves.sort(function(a, b) { return compare_by_score(data['refutation_lines'], data['position']['toplay'] === 'B', a, b) });
659 moves.unshift(data['pv'][0]);
668 var thousands = function(x) {
669 return String(x).split('').reverse().join('').replace(/(\d{3}\B)/g, '$1,').split('').reverse().join('');
673 * @param {!string} start_fen
674 * @param {Array.<string>} pv
675 * @param {number} move_num
676 * @param {!string} toplay
677 * @param {Array<{ first_move: integer, score: Object }>} scores
678 * @param {number} start_display_move_num
679 * @param {number=} opt_limit
680 * @param {boolean=} opt_showlast
682 var add_pv = function(start_fen, pv, move_num, toplay, scores, start_display_move_num, opt_limit, opt_showlast) {
684 start_fen: start_fen,
686 move_num: parseInt(move_num),
689 start_display_move_num: start_display_move_num
691 var splicepos = null;
692 if (scores !== null && scores.length >= 1 &&
693 scores[scores.length - 1].score !== undefined &&
694 scores[scores.length - 1].score !== null &&
695 (scores[scores.length - 1].score[0] === 'T' ||
696 scores[scores.length - 1].score[0] === 't')) {
697 splicepos = scores[scores.length - 1].score[1];
699 return print_pv(display_lines.length - 1, splicepos, opt_limit, opt_showlast);
703 * @param {number} line_num
704 * @param {?number} splicepos If non-null, where the tablebase-spliced portion of the TB starts.
705 * @param {number=} opt_limit If set, show at most this number of moves.
706 * @param {boolean=} opt_showlast If limit is set, show the last moves instead of the first ones.
708 var print_pv = function(line_num, splicepos, opt_limit, opt_showlast) {
709 var display_line = display_lines[line_num];
710 var pv = display_line.pv;
711 var move_num = display_line.move_num;
712 var toplay = display_line.toplay;
714 // Truncate PV at the start if needed.
715 var start_display_move_num = display_line.start_display_move_num;
716 if (start_display_move_num > 0) {
717 pv = pv.slice(start_display_move_num);
718 var to_add = start_display_move_num;
719 if (toplay === 'B') {
724 if (to_add % 2 == 1) {
728 move_num += to_add / 2;
729 if (splicepos !== null && splicepos > 0) {
737 if (opt_limit && opt_showlast && pv.length > opt_limit) {
738 // Truncate the PV at the beginning (instead of at the end).
739 // We assume here that toplay is 'W'. We also assume that if
740 // opt_showlast is set, then it is the history, and thus,
741 // the UI should be to expand the history.
742 ret = '(<a class="move" href="javascript:collapse_history(false)">…</a>) ';
743 i = pv.length - opt_limit;
748 } else if (toplay == 'B' && pv.length > 0) {
750 if (splicepos === 0) {
754 move += "<a class=\"move\" id=\"automove" + line_num + "-0\" href=\"javascript:show_line(" + line_num + ", " + 0 + ");\">" + pv[0] + "</a>";
755 ret = move_num + '. … ' + move;
760 for ( ; i < pv.length; ++i) {
761 var move = "<a class=\"move\" id=\"automove" + line_num + "-" + i + "\" href=\"javascript:show_line(" + line_num + ", " + i + ");\">" + pv[i] + "</a>";
762 if (splicepos === i) {
768 if (i > opt_limit && !opt_showlast) {
777 ret += move_num + '. ' + move;
791 /** Update the highlighted to/from squares on the board.
792 * Based on the global "highlight_from" and "highlight_to" variables.
794 var update_board_highlight = function() {
795 $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
796 if ((current_display_line === null || current_display_line_is_history) &&
797 highlight_from !== undefined && highlight_to !== undefined) {
798 $("#board").find('.square-' + highlight_from).addClass('nonuglyhighlight');
799 $("#board").find('.square-' + highlight_to).addClass('nonuglyhighlight');
803 var update_history = function() {
804 if (display_lines[0] === null || display_lines[0].pv.length == 0) {
805 $("#history").html("No history");
806 } else if (truncate_display_history) {
807 $("#history").html(print_pv(0, null, 8, true));
810 '(<a class="move" href="javascript:collapse_history(true)">collapse</a>) ' +
816 * @param {!boolean} truncate_history
818 var collapse_history = function(truncate_history) {
819 truncate_display_history = truncate_history;
822 window['collapse_history'] = collapse_history;
824 /** Update the HTML display of multi-PV from the global "refutation_lines".
826 * Also recreates the global "display_lines".
828 var update_refutation_lines = function() {
829 if (base_fen === null) {
832 if (display_lines.length > 2) {
833 // Truncate so that only the history and PV is left.
834 display_lines = [ display_lines[0], display_lines[1] ];
836 var tbl = $("#refutationlines");
839 if (display_lines.length < 2) {
843 // Find out where the lines start from.
845 var base_scores = display_lines[1].scores;
846 var start_display_move_num = 0;
847 if (hash_refutation_lines) {
848 base_line = current_display_line.pv.slice(0, current_display_move + 1);
849 base_scores = current_display_line.scores;
850 start_display_move_num = base_line.length;
854 for (var move in refutation_lines) {
858 var invert = (toplay === 'B');
859 if (current_display_line && current_display_move % 2 == 0 && !current_display_line_is_history) {
862 moves = moves.sort(function(a, b) { return compare_by_score(refutation_lines, invert, a, b) });
863 for (var i = 0; i < moves.length; ++i) {
864 var line = refutation_lines[moves[i]];
866 var tr = document.createElement("tr");
868 var move_td = document.createElement("td");
869 tr.appendChild(move_td);
870 $(move_td).addClass("move");
872 var scores = base_scores.concat([{ first_move: start_display_move_num, score: line['score'] }]);
874 if (line['pv'].length == 0) {
875 // Not found, so just make a one-move PV.
876 var move = "<a class=\"move\" href=\"javascript:show_line(" + display_lines.length + ", " + 0 + ");\">" + line['move'] + "</a>";
877 $(move_td).html(move);
878 var score_td = document.createElement("td");
880 $(score_td).addClass("score");
881 $(score_td).text("—");
882 tr.appendChild(score_td);
884 var depth_td = document.createElement("td");
885 tr.appendChild(depth_td);
886 $(depth_td).addClass("depth");
887 $(depth_td).text("—");
889 var pv_td = document.createElement("td");
890 tr.appendChild(pv_td);
891 $(pv_td).addClass("pv");
892 $(pv_td).html(add_pv(base_fen, base_line.concat([ line['move'] ]), move_num, toplay, scores, start_display_move_num));
898 var move = "<a class=\"move\" href=\"javascript:show_line(" + display_lines.length + ", " + 0 + ");\">" + line['move'] + "</a>";
899 $(move_td).html(move);
901 var score_td = document.createElement("td");
902 tr.appendChild(score_td);
903 $(score_td).addClass("score");
904 $(score_td).text(format_short_score(line['score']));
906 var depth_td = document.createElement("td");
907 tr.appendChild(depth_td);
908 $(depth_td).addClass("depth");
909 if (line['depth'] && line['depth'] >= 0) {
910 $(depth_td).text("d" + line['depth']);
912 $(depth_td).text("—");
915 var pv_td = document.createElement("td");
916 tr.appendChild(pv_td);
917 $(pv_td).addClass("pv");
918 $(pv_td).html(add_pv(base_fen, base_line.concat(line['pv']), move_num, toplay, scores, start_display_move_num, 10));
923 // Update the move highlight, as we've rewritten all the HTML.
924 update_move_highlight();
928 * Create a Chess.js board object, containing the given position plus the given moves,
929 * up to the given limit.
931 * @param {?string} fen
932 * @param {Array.<string>} moves
933 * @param {number} last_move
935 var chess_from = function(fen, moves, last_move) {
936 var hiddenboard = new Chess();
937 if (fen !== null && fen !== undefined) {
938 hiddenboard.load(fen);
940 for (var i = 0; i <= last_move; ++i) {
941 if (moves[i] === '0-0') {
942 hiddenboard.move('O-O');
943 } else if (moves[i] === '0-0-0') {
944 hiddenboard.move('O-O-O');
946 hiddenboard.move(moves[i]);
952 var update_game_list = function(games) {
953 $("#games").text("");
954 if (games === null) {
958 var games_div = document.getElementById('games');
959 for (var game_num = 0; game_num < games.length; ++game_num) {
960 var game = games[game_num];
961 var game_span = document.createElement("span");
962 game_span.setAttribute("class", "game");
964 var game_name = document.createTextNode(game['name']);
965 if (game['url'] === backend_url) {
967 game_span.appendChild(game_name);
969 if (current_analysis_data && current_analysis_data['position']) {
971 if (current_analysis_data['position']['result']) {
972 score = " (" + current_analysis_data['position']['result'] + ")";
974 score = " (" + format_short_score(current_analysis_data['score']) + ")";
976 game_span.appendChild(document.createTextNode(score));
980 var game_a = document.createElement("a");
981 game_a.setAttribute("href", "#" + game['id']);
982 game_a.appendChild(game_name);
983 game_span.appendChild(game_a);
986 if (game['result']) {
987 score = " (" + game['result'] + ")";
989 score = " (" + format_short_score(game['score']) + ")";
991 game_span.appendChild(document.createTextNode(score));
994 games_div.appendChild(game_span);
999 * Try to find a running game that matches with the current hash,
1000 * and switch to it if we're not already displaying it.
1002 var possibly_switch_game_from_hash = function() {
1003 var history_match = window.location.hash.match(/^#history=([a-zA-Z0-9_-]+)/);
1004 if (history_match !== null) {
1005 var game_id = history_match[1];
1007 url: '/history/' + game_id + '.json',
1009 id: 'history=' + game_id
1011 switch_backend(fake_game);
1015 if (current_games === null) {
1019 var hash = window.location.hash.replace(/^#/,'');
1020 for (var i = 0; i < current_games.length; ++i) {
1021 if (current_games[i]['id'] === hash) {
1022 if (backend_url !== current_games[i]['url']) {
1023 switch_backend(current_games[i]);
1031 * If this is a Chess960 castling which doesn't move the king,
1032 * move the rook instead.
1034 var patch_move = function(move) {
1035 if (move === null) return null;
1036 if (move.from !== move.to) return move;
1038 var f = move.rook_sq & 15;
1039 var r = move.rook_sq >> 4;
1040 var from = ('abcdefgh'.substring(f,f+1) + '87654321'.substring(r,r+1));
1043 if (move.to === 'g1') {
1045 } else if (move.to === 'g8') {
1047 } else if (move.to === 'b1') {
1049 } else if (move.to === 'b8') {
1053 return { from: from, to: to };
1056 /** Update all the HTML on the page, based on current global state.
1058 var update_board = function() {
1059 document.body.style.opacity = null;
1061 var data = displayed_analysis_data || current_analysis_data;
1062 var current_data = current_analysis_data; // Convenience alias.
1066 // Print the history. This is pretty much the only thing that's
1067 // unconditionally taken from current_data (we're not interested in
1068 // historic history).
1069 if (current_data['position']['history']) {
1070 var start = (current_data['position'] && current_data['position']['start_fen']) ? current_data['position']['start_fen'] : 'start';
1071 add_pv(start, current_data['position']['history'], 1, 'W', null, 0, 8, true);
1073 display_lines.push(null);
1077 // Games currently in progress, if any.
1078 if (current_data['games']) {
1079 current_games = current_data['games'];
1080 possibly_switch_game_from_hash();
1082 current_games = null;
1084 update_game_list(current_games);
1086 // The headline. Names are always fetched from current_data;
1087 // the rest can depend a bit.
1090 current_data['position']['player_w'] && current_data['position']['player_b']) {
1091 headline = current_data['position']['player_w'] + '–' +
1092 current_data['position']['player_b'] + ', analysis';
1094 headline = 'Analysis';
1097 // Credits, where applicable. Note that we don't want the footer to change a lot
1098 // when e.g. viewing history, so if any of these changed during the game,
1099 // use the current one still.
1100 if (current_data['using_lomonosov']) {
1101 $("#lomonosov").show();
1103 $("#lomonosov").hide();
1106 // Credits: The engine name/version.
1107 if (current_data['engine'] && current_data['engine']['name'] !== null) {
1108 $("#engineid").text(current_data['engine']['name']);
1111 // Credits: The engine URL.
1112 if (current_data['engine'] && current_data['engine']['url']) {
1113 $("#engineid").attr("href", current_data['engine']['url']);
1115 $("#engineid").removeAttr("href");
1118 // Credits: Engine details.
1119 if (current_data['engine'] && current_data['engine']['details']) {
1120 $("#enginedetails").text(" (" + current_data['engine']['details'] + ")");
1122 $("#enginedetails").text("");
1125 // Credits: Move source, possibly with URL.
1126 if (current_data['move_source'] && current_data['move_source_url']) {
1127 $("#movesource").text("Moves provided by ");
1128 var movesource_a = document.createElement("a");
1129 movesource_a.setAttribute("href", current_data['move_source_url']);
1130 var movesource_text = document.createTextNode(current_data['move_source']);
1131 movesource_a.appendChild(movesource_text);
1132 var movesource_period = document.createTextNode(".");
1133 document.getElementById("movesource").appendChild(movesource_a);
1134 document.getElementById("movesource").appendChild(movesource_period);
1135 } else if (current_data['move_source']) {
1136 $("#movesource").text("Moves provided by " + current_data['move_source'] + ".");
1138 $("#movesource").text("");
1142 if (displayed_analysis_data) {
1143 // Displaying some non-current position, pick out the last move
1144 // from the history. This will work even if the fetch failed.
1145 if (current_display_move !== -1) {
1146 last_move = format_halfmove_with_number(
1147 current_display_line.pv[current_display_move],
1148 current_display_move);
1149 headline += ' after ' + last_move;
1151 } else if (data['position']['last_move'] !== 'none') {
1152 // Find the previous move.
1153 var previous_move_num, previous_toplay;
1154 if (data['position']['toplay'] == 'B') {
1155 previous_move_num = data['position']['move_num'];
1156 previous_toplay = 'W';
1158 previous_move_num = data['position']['move_num'] - 1;
1159 previous_toplay = 'B';
1162 last_move = format_move_with_number(
1163 data['position']['last_move'],
1165 previous_toplay == 'W');
1166 headline += ' after ' + last_move;
1170 $("#headline").text(headline);
1172 // The <title> contains a very brief headline.
1173 var title_elems = [];
1174 if (data['position'] && data['position']['result']) {
1175 title_elems.push(data['position']['result']);
1176 } else if (data['score']) {
1177 title_elems.push(format_short_score(data['score']));
1179 if (last_move !== null) {
1180 title_elems.push(last_move);
1183 if (title_elems.length != 0) {
1184 document.title = '(' + title_elems.join(', ') + ') analysis.sesse.net';
1186 document.title = 'analysis.sesse.net';
1189 // The last move (shown by highlighting the from and to squares).
1190 if (data['position'] && data['position']['last_move_uci']) {
1191 highlight_from = data['position']['last_move_uci'].substr(0, 2);
1192 highlight_to = data['position']['last_move_uci'].substr(2, 2);
1193 } else if (current_display_line_is_history && current_display_line && current_display_move >= 0) {
1194 // We don't have historic analysis for this position, but we
1195 // can reconstruct what the last move was by just replaying
1197 var position = (data['position'] && data['position']['start_fen']) ? data['position']['start_fen'] : null;
1198 var hiddenboard = chess_from(position, current_display_line.pv, current_display_move);
1199 var moves = hiddenboard.history({ verbose: true });
1200 last_move = moves.pop();
1201 highlight_from = last_move.from;
1202 highlight_to = last_move.to;
1204 highlight_from = highlight_to = undefined;
1206 update_board_highlight();
1208 if (data['failed']) {
1209 $("#score").text("No analysis for this move");
1210 $("#pvtitle").text("PV:");
1212 $("#searchstats").html(" ");
1213 $("#refutationlines").empty();
1214 $("#whiteclock").empty();
1215 $("#blackclock").empty();
1216 refutation_lines = [];
1217 update_refutation_lines();
1219 update_displayed_line();
1220 update_move_highlight();
1227 if (current_display_line && !current_display_line_is_history) {
1229 if (current_display_line.scores && current_display_line.scores.length > 0) {
1230 for (var i = 0; i < current_display_line.scores.length; ++i) {
1231 if (current_display_move < current_display_line.scores[i].first_move) {
1234 score = current_display_line.scores[i].score;
1238 $("#score").text(format_long_score(score));
1240 $("#score").text("No score for this line");
1242 } else if (data['score']) {
1243 $("#score").text(format_long_score(data['score']));
1246 // The search stats.
1247 if (data['searchstats']) {
1248 $("#searchstats").html(data['searchstats']);
1249 } else if (data['tablebase'] == 1) {
1250 $("#searchstats").text("Tablebase result");
1251 } else if (data['nodes'] && data['nps'] && data['depth']) {
1252 var stats = thousands(data['nodes']) + ' nodes, ' + thousands(data['nps']) + ' nodes/sec, depth ' + data['depth'] + ' ply';
1253 if (data['seldepth']) {
1254 stats += ' (' + data['seldepth'] + ' selective)';
1256 if (data['tbhits'] && data['tbhits'] > 0) {
1257 if (data['tbhits'] == 1) {
1258 stats += ', one Syzygy hit';
1260 stats += ', ' + thousands(data['tbhits']) + ' Syzygy hits';
1264 $("#searchstats").text(stats);
1266 $("#searchstats").text("");
1269 // Update the board itself.
1270 base_fen = data['position']['fen'];
1271 update_displayed_line();
1274 $("#pvtitle").text("PV:");
1276 var scores = [{ first_move: -1, score: data['score'] }];
1277 $("#pv").html(add_pv(data['position']['fen'], data['pv'], data['position']['move_num'], data['position']['toplay'], scores, 0));
1279 // Update the PV arrow.
1281 if (data['pv'].length >= 1) {
1282 var hiddenboard = new Chess(base_fen);
1284 // draw a continuation arrow as long as it's the same piece
1286 for (var i = 0; i < data['pv'].length; i += 2) {
1287 var move = patch_move(hiddenboard.move(data['pv'][i]));
1289 if ((i >= 2 && move.from != last_to) ||
1290 interfering_arrow(move.from, move.to)) {
1293 create_arrow(move.from, move.to, '#f66', 6, 20);
1295 hiddenboard.move(data['pv'][i + 1]); // To keep continuity.
1298 var alt_moves = find_nonstupid_moves(data, 30, data['position']['toplay'] === 'B');
1299 for (var i = 1; i < alt_moves.length && i < 3; ++i) {
1300 hiddenboard = new Chess(base_fen);
1301 var move = patch_move(hiddenboard.move(alt_moves[i]));
1302 if (move !== null) {
1303 create_arrow(move.from, move.to, '#f66', 1, 10);
1308 // See if all semi-reasonable moves have only one possible response.
1309 if (data['pv'].length >= 2) {
1310 var nonstupid_moves = find_nonstupid_moves(data, 300, data['position']['toplay'] === 'B');
1313 var hiddenboard = new Chess(base_fen);
1314 hiddenboard.move(data['pv'][0]);
1315 response = hiddenboard.move(data['pv'][1]);
1317 for (var i = 0; i < nonstupid_moves.length; ++i) {
1318 if (nonstupid_moves[i] == data['pv'][0]) {
1319 // ignore the PV move for refutation lines.
1322 if (!data['refutation_lines'] ||
1323 !data['refutation_lines'][nonstupid_moves[i]] ||
1324 !data['refutation_lines'][nonstupid_moves[i]]['pv'] ||
1325 data['refutation_lines'][nonstupid_moves[i]]['pv'].length < 2) {
1326 // Incomplete PV, abort.
1327 response = undefined;
1330 var line = data['refutation_lines'][nonstupid_moves[i]];
1331 hiddenboard = new Chess(base_fen);
1332 hiddenboard.move(line['pv'][0]);
1333 var this_response = hiddenboard.move(line['pv'][1]);
1334 if (this_response === null) {
1335 console.log("BUG: ", i);
1337 console.log(line['pv']);
1339 if (response.from !== this_response.from || response.to !== this_response.to) {
1340 // Different response depending on lines, abort.
1341 response = undefined;
1346 if (nonstupid_moves.length > 0 && response !== undefined) {
1347 create_arrow(response.from, response.to, '#66f', 6, 20);
1351 // Update the refutation lines.
1352 base_fen = data['position']['fen'];
1353 move_num = parseInt(data['position']['move_num']);
1354 toplay = data['position']['toplay'];
1355 refutation_lines = hash_refutation_lines || data['refutation_lines'];
1356 update_refutation_lines();
1358 // Update the sparkline last, since its size depends on how everything else reflowed.
1359 update_sparkline(data);
1362 var update_sparkline = function(data) {
1363 if (data && data['score_history']) {
1364 var first_move_num = undefined;
1365 for (var halfmove_num in data['score_history']) {
1366 halfmove_num = parseInt(halfmove_num);
1367 if (first_move_num === undefined || halfmove_num < first_move_num) {
1368 first_move_num = halfmove_num;
1371 if (first_move_num !== undefined) {
1372 var last_move_num = data['position']['move_num'] * 2 - 3;
1373 if (data['position']['toplay'] === 'B') {
1377 // Possibly truncate some moves if we don't have enough width.
1378 // FIXME: Sometimes width() for #scorecontainer (and by extent,
1379 // #scoresparkcontainer) on Chrome for mobile seems to start off
1380 // at something very small, and then suddenly snap back into place.
1382 var max_moves = Math.floor($("#scoresparkcontainer").width() / 5) - 5;
1383 if (last_move_num - first_move_num > max_moves) {
1384 first_move_num = last_move_num - max_moves;
1387 var min_score = -100;
1388 var max_score = 100;
1389 var last_score = null;
1391 for (var halfmove_num = first_move_num; halfmove_num <= last_move_num; ++halfmove_num) {
1392 if (data['score_history'][halfmove_num]) {
1393 var score = compute_plot_score(data['score_history'][halfmove_num]);
1395 if (score < min_score) min_score = score;
1396 if (score > max_score) max_score = score;
1398 scores.push(last_score);
1400 if (data['score']) {
1401 scores.push(compute_plot_score(data['score']));
1403 // FIXME: at some widths, calling sparkline() seems to push
1404 // #scorecontainer under the board.
1405 $('#scorespark').unbind('sparklineClick');
1406 $("#scorespark").sparkline(scores, {
1409 chartRangeMin: min_score,
1410 chartRangeMax: max_score,
1411 tooltipFormatter: function(sparkline, options, fields) {
1412 // score_history contains the Nth _position_, but format_tooltip
1413 // wants to format the Nth _move_; thus the -1.
1414 return format_tooltip(data, fields[0].offset + first_move_num - 1);
1417 $('#scorespark').unbind('sparklineClick');
1418 $('#scorespark').bind('sparklineClick', function(event) {
1419 var sparkline = event.sparklines[0];
1420 var region = sparkline.getCurrentRegionFields();
1421 if (region[0].offset !== undefined) {
1422 show_line(0, first_move_num + region[0].offset - 1);
1426 $("#scorespark").text("");
1429 $("#scorespark").text("");
1434 * @param {number} num_viewers
1436 var update_num_viewers = function(num_viewers) {
1438 if (num_viewers === null) {
1440 } else if (num_viewers == 1) {
1441 text = "You are the only current viewer";
1443 text = num_viewers + " current viewers";
1445 if (display_fen !== null) {
1446 var counter = Math.floor(display_fen.split(" ")[4] / 2);
1447 if (counter >= 20) {
1448 text = text.replace("current ", "");
1449 text += " | 50-move rule: " + counter;
1452 $("#numviewers").text(text);
1455 var update_clock = function() {
1456 clearTimeout(clock_timer);
1458 var data = displayed_analysis_data || current_analysis_data;
1461 if (data['position']) {
1462 var result = data['position']['result'];
1463 if (result === '1-0') {
1464 $("#whiteclock").text("1");
1465 $("#blackclock").text("0");
1466 $("#whiteclock").removeClass("running-clock");
1467 $("#blackclock").removeClass("running-clock");
1470 if (result === '1/2-1/2') {
1471 $("#whiteclock").text("1/2");
1472 $("#blackclock").text("1/2");
1473 $("#whiteclock").removeClass("running-clock");
1474 $("#blackclock").removeClass("running-clock");
1477 if (result === '0-1') {
1478 $("#whiteclock").text("0");
1479 $("#blackclock").text("1");
1480 $("#whiteclock").removeClass("running-clock");
1481 $("#blackclock").removeClass("running-clock");
1486 var white_clock_ms = null;
1487 var black_clock_ms = null;
1490 if (data['position'] &&
1491 data['position']['white_clock'] &&
1492 data['position']['black_clock']) {
1493 white_clock_ms = data['position']['white_clock'] * 1000;
1494 black_clock_ms = data['position']['black_clock'] * 1000;
1497 // Dynamic clock (only one, obviously).
1499 if (data['position']['white_clock_target']) {
1501 $("#whiteclock").addClass("running-clock");
1502 $("#blackclock").removeClass("running-clock");
1503 } else if (data['position']['black_clock_target']) {
1505 $("#whiteclock").removeClass("running-clock");
1506 $("#blackclock").addClass("running-clock");
1508 $("#whiteclock").removeClass("running-clock");
1509 $("#blackclock").removeClass("running-clock");
1513 var now = new Date().getTime() + client_clock_offset_ms;
1514 remaining_ms = data['position'][color + '_clock_target'] * 1000 - now;
1515 if (color === "white") {
1516 white_clock_ms = remaining_ms;
1518 black_clock_ms = remaining_ms;
1522 if (white_clock_ms === null || black_clock_ms === null) {
1523 $("#whiteclock").empty();
1524 $("#blackclock").empty();
1528 // If either player has twenty minutes or less left, add the second counters.
1529 // This matches what DGT clocks do.
1530 var show_seconds = (white_clock_ms < 60 * 20 * 1000 || black_clock_ms < 60 * 20 * 1000);
1533 // See when the clock will change next, and update right after that.
1536 next_update_ms = remaining_ms % 1000 + 100;
1538 next_update_ms = remaining_ms % 60000 + 100;
1540 clock_timer = setTimeout(update_clock, next_update_ms);
1543 $("#whiteclock").text(format_clock(white_clock_ms, show_seconds));
1544 $("#blackclock").text(format_clock(black_clock_ms, show_seconds));
1548 * @param {Number} remaining_ms
1549 * @param {boolean} show_seconds
1551 var format_clock = function(remaining_ms, show_seconds) {
1552 if (remaining_ms <= 0) {
1560 var remaining = Math.floor(remaining_ms / 1000);
1561 var seconds = remaining % 60;
1562 remaining = (remaining - seconds) / 60;
1563 var minutes = remaining % 60;
1564 remaining = (remaining - minutes) / 60;
1565 var hours = remaining;
1567 return format_2d(hours) + ":" + format_2d(minutes) + ":" + format_2d(seconds);
1569 return format_2d(hours) + ":" + format_2d(minutes);
1576 var format_2d = function(x) {
1585 * @param {string} move
1586 * @param {Number} move_num Move number of this move.
1587 * @param {boolean} white_to_play Whether white is to play this move.
1589 var format_move_with_number = function(move, move_num, white_to_play) {
1591 if (white_to_play) {
1592 ret = move_num + '. ';
1594 ret = move_num + '… ';
1601 * @param {string} move
1602 * @param {Number} halfmove_num Half-move number that is to be played,
1605 var format_halfmove_with_number = function(move, halfmove_num) {
1606 return format_move_with_number(
1608 Math.floor(halfmove_num / 2) + 1,
1609 halfmove_num % 2 == 0);
1613 * @param {Object} data
1614 * @param {Number} halfmove_num
1616 var format_tooltip = function(data, halfmove_num) {
1617 if (data['score_history'][halfmove_num + 1] ||
1618 (halfmove_num + 1) === data['position']['history'].length) {
1619 // Position is in the history, or it is the current position
1620 // (which is implicitly tacked onto the history).
1623 if ((halfmove_num + 1) === data['position']['history'].length) {
1624 move = data['position']['last_move'];
1625 short_score = format_short_score(data['score']);
1627 move = data['position']['history'][halfmove_num];
1628 short_score = format_short_score(data['score_history'][halfmove_num + 1]);
1630 if (halfmove_num === -1) {
1631 return "Start position: " + short_score;
1633 var move_with_number = format_halfmove_with_number(move, halfmove_num);
1634 return "After " + move_with_number + ": " + short_score;
1637 for (var i = halfmove_num; i --> -1; ) {
1638 if (data['score_history'][i]) {
1639 var move = data['position']['history'][i];
1641 return "[Analysis kept from start position]";
1643 return "[Analysis kept from " + format_halfmove_with_number(move, i) + "]";
1651 * @param {boolean} truncate_history
1653 var set_truncate_history = function(truncate_history) {
1654 truncate_display_history = truncate_history;
1655 update_refutation_lines();
1657 window['set_truncate_history'] = set_truncate_history;
1660 * @param {number} line_num
1661 * @param {number} move_num
1663 var show_line = function(line_num, move_num) {
1664 if (line_num == -1) {
1665 current_display_line = null;
1666 current_display_move = null;
1667 hash_refutation_lines = null;
1668 if (displayed_analysis_data) {
1669 // TODO: Support exiting to history position if we are in an
1670 // analysis line of a history position.
1671 displayed_analysis_data = null;
1676 current_display_line = jQuery.extend({}, display_lines[line_num]); // Shallow clone.
1677 current_display_move = move_num + current_display_line.start_display_move_num;
1679 current_display_line_is_history = (line_num == 0);
1681 update_historic_analysis();
1682 update_displayed_line();
1683 update_board_highlight();
1684 update_move_highlight();
1687 window['show_line'] = show_line;
1689 var prev_move = function() {
1690 if (current_display_line &&
1691 current_display_move >= current_display_line.start_display_move_num) {
1692 --current_display_move;
1694 update_historic_analysis();
1695 update_displayed_line();
1696 update_move_highlight();
1698 window['prev_move'] = prev_move;
1700 var next_move = function() {
1701 if (current_display_line &&
1702 current_display_move < current_display_line.pv.length - 1) {
1703 ++current_display_move;
1705 update_historic_analysis();
1706 update_displayed_line();
1707 update_move_highlight();
1709 window['next_move'] = next_move;
1711 var next_game = function() {
1712 if (current_games === null) {
1716 // Try to find the game we are currently looking at.
1717 for (var game_num = 0; game_num < current_games.length; ++game_num) {
1718 var game = current_games[game_num];
1719 if (game['url'] === backend_url) {
1720 var next_game_num = (game_num + 1) % current_games.length;
1721 switch_backend(current_games[next_game_num]);
1726 // Couldn't find it; give up.
1729 var update_historic_analysis = function() {
1730 if (!current_display_line_is_history) {
1733 if (current_display_move == current_display_line.pv.length - 1) {
1734 displayed_analysis_data = null;
1738 // Fetch old analysis for this line if it exists.
1739 var hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move);
1740 var filename = "/history/move" + (current_display_move + 1) + "-" +
1741 hiddenboard.fen().replace(/ /g, '_').replace(/\//g, '-') + ".json";
1743 let handle_err = () => {
1744 displayed_analysis_data = {'failed': true};
1748 current_historic_xhr = new AbortController();
1749 const signal = current_analysis_xhr.signal;
1750 fetch(filename, { signal })
1751 .then((response) => response.json().then(data => ({ok: response.ok, json: data}))) // ick
1757 displayed_analysis_data = obj.json;
1761 if (err.name === 'AbortError') {
1762 // Aborted because we are switching backends. Abandon and don't retry,
1763 // because another one is already started for us.
1771 * @param {string} fen
1773 var update_imbalance = function(fen) {
1774 var hiddenboard = new Chess(fen);
1775 var imbalance = {'k': 0, 'q': 0, 'r': 0, 'b': 0, 'n': 0, 'p': 0};
1776 for (var row = 0; row < 8; ++row) {
1777 for (var col = 0; col < 8; ++col) {
1778 var col_text = String.fromCharCode('a1'.charCodeAt(0) + col);
1779 var row_text = String.fromCharCode('a1'.charCodeAt(1) + row);
1780 var square = col_text + row_text;
1781 var contents = hiddenboard.get(square);
1782 if (contents !== null) {
1783 if (contents.color === 'w') {
1784 ++imbalance[contents.type];
1786 --imbalance[contents.type];
1791 var white_imbalance = '';
1792 var black_imbalance = '';
1793 for (var piece in imbalance) {
1794 for (var i = 0; i < imbalance[piece]; ++i) {
1795 white_imbalance += '<img src="' + svg_pieces['w' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-piece">';
1796 white_imbalance += '<img src="' + svg_pieces['b' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-inverted-piece">';
1798 for (var i = 0; i < -imbalance[piece]; ++i) {
1799 black_imbalance += '<img src="' + svg_pieces['b' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-piece">';
1800 black_imbalance += '<img src="' + svg_pieces['w' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-inverted-piece">';
1803 $('#whiteimbalance').html(white_imbalance);
1804 $('#blackimbalance').html(black_imbalance);
1807 /** Mark the currently selected move in red.
1808 * Also replaces the PV with the current displayed line if it's not shown
1809 * anywhere else on the screen.
1811 var update_move_highlight = function() {
1812 if (highlighted_move !== null) {
1813 highlighted_move.removeClass('highlight');
1815 if (current_display_line) {
1816 var display_line_num = find_display_line_matching_num();
1817 if (display_line_num === null) {
1818 // Replace the PV with the (complete) line.
1819 $("#pvtitle").text("Exploring:");
1820 current_display_line.start_display_move_num = 0;
1821 display_lines.push(current_display_line);
1822 $("#pv").html(print_pv(display_lines.length - 1, null)); // FIXME
1823 display_line_num = display_lines.length - 1;
1825 // Clear out the PV, so it's not selected by anything later.
1826 display_lines[1].pv = [];
1829 highlighted_move = $("#automove" + display_line_num + "-" + (current_display_move - current_display_line.start_display_move_num));
1830 highlighted_move.addClass('highlight');
1835 * See if the current displayed line is identical to any of the ones
1836 * we have on screen. (It might not be if e.g. the analysis reloaded
1837 * since we started looking.)
1841 var find_display_line_matching_num = function() {
1842 for (var i = 0; i < display_lines.length; ++i) {
1843 var line = display_lines[i];
1844 if (line.start_display_move_num > 0) continue;
1845 if (current_display_line.start_fen !== line.start_fen) continue;
1846 if (current_display_line.pv.length !== line.pv.length) continue;
1848 for (var j = 0; j < line.pv.length; ++j) {
1849 if (current_display_line.pv[j] !== line.pv[j]) {
1861 /** Update the board based on the currently displayed line.
1863 * TODO: This should really be called only whenever something changes,
1864 * instead of all the time.
1866 var update_displayed_line = function() {
1867 if (current_display_line === null) {
1868 $("#linenav").hide();
1869 $("#linemsg").show();
1870 display_fen = base_fen;
1871 set_board_position(base_fen);
1872 update_imbalance(base_fen);
1876 $("#linenav").show();
1877 $("#linemsg").hide();
1879 if (current_display_move <= 0) {
1880 $("#prevmove").html("Previous");
1882 $("#prevmove").html("<a href=\"javascript:prev_move();\">Previous</a></span>");
1884 if (current_display_move == current_display_line.pv.length - 1) {
1885 $("#nextmove").html("Next");
1887 $("#nextmove").html("<a href=\"javascript:next_move();\">Next</a></span>");
1890 var hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move);
1891 set_board_position(hiddenboard.fen());
1892 if (display_fen !== hiddenboard.fen() && !current_display_line_is_history) {
1893 // Fire off a hash request, since we're now off the main position
1894 // and it just changed.
1895 explore_hash(hiddenboard.fen());
1897 display_fen = hiddenboard.fen();
1898 update_imbalance(hiddenboard.fen());
1901 var set_board_position = function(new_fen) {
1902 board_is_animating = true;
1903 var old_fen = board.fen();
1904 board.position(new_fen);
1905 if (board.fen() === old_fen) {
1906 board_is_animating = false;
1911 * @param {boolean} param_enable_sound
1913 var set_sound = function(param_enable_sound) {
1914 enable_sound = param_enable_sound;
1916 $("#soundon").html("<strong>On</strong>");
1917 $("#soundoff").html("<a href=\"javascript:set_sound(false)\">Off</a>");
1919 // Seemingly at least Firefox prefers MP3 over Opus; tell it otherwise,
1920 // and also preload the file since the user has selected audio.
1921 var ding = document.getElementById('ding');
1922 if (ding && ding.canPlayType && ding.canPlayType('audio/ogg; codecs="opus"') === 'probably') {
1923 ding.src = 'ding.opus';
1927 $("#soundon").html("<a href=\"javascript:set_sound(true)\">On</a>");
1928 $("#soundoff").html("<strong>Off</strong>");
1930 if (supports_html5_storage()) {
1931 localStorage['enable_sound'] = enable_sound ? 1 : 0;
1934 window['set_sound'] = set_sound;
1936 /** Send off a hash probe request to the backend.
1937 * @param {string} fen
1939 var explore_hash = function(fen) {
1940 // If we already have a backend response going, abort it.
1941 if (current_hash_xhr) {
1942 current_hash_xhr.abort();
1944 if (current_hash_display_timer) {
1945 clearTimeout(current_hash_display_timer);
1946 current_hash_display_timer = null;
1948 $("#refutationlines").empty();
1950 current_hash_xhr = new AbortController();
1951 const signal = current_analysis_xhr.signal;
1952 fetch(backend_hash_url + "?fen=" + fen, { signal })
1953 .then((response) => response.json())
1954 .then((data) => { show_explore_hash_results(data, fen); });
1957 /** Process the JSON response from a hash probe request.
1958 * @param {!Object} data
1959 * @param {string} fen
1961 var show_explore_hash_results = function(data, fen) {
1962 if (board_is_animating) {
1963 // Updating while the animation is still going causes
1964 // the animation to jerk. This is pretty crude, but it will do.
1965 current_hash_display_timer = setTimeout(function() { show_explore_hash_results(data, fen); }, 100);
1968 current_hash_display_timer = null;
1969 hash_refutation_lines = data['lines'];
1973 // almost all of this stuff comes from the chessboard.js example page
1974 var onDragStart = function(source, piece, position, orientation) {
1975 var pseudogame = new Chess(display_fen);
1976 if (pseudogame.game_over() === true ||
1977 (pseudogame.turn() === 'w' && piece.search(/^b/) !== -1) ||
1978 (pseudogame.turn() === 'b' && piece.search(/^w/) !== -1)) {
1982 recommended_move = get_best_move(pseudogame, source, null, pseudogame.turn() === 'b');
1983 if (recommended_move) {
1984 var squareEl = $('#board .square-' + recommended_move.to);
1985 squareEl.addClass('highlight1-32417');
1990 var mousedownSquare = function(e) {
1991 reverse_dragging_from = null;
1992 var square = $(this).attr('data-square');
1994 var pseudogame = new Chess(display_fen);
1995 if (pseudogame.game_over() === true) {
1999 // If the square is empty, or has a piece of the side not to move,
2000 // we handle it. If not, normal piece dragging will take it.
2001 var position = board.position();
2002 if (!position.hasOwnProperty(square) ||
2003 (pseudogame.turn() === 'w' && position[square].search(/^b/) !== -1) ||
2004 (pseudogame.turn() === 'b' && position[square].search(/^w/) !== -1)) {
2005 reverse_dragging_from = square;
2006 recommended_move = get_best_move(pseudogame, null, square, pseudogame.turn() === 'b');
2007 if (recommended_move) {
2008 var squareEl = $('#board .square-' + recommended_move.from);
2009 squareEl.addClass('highlight1-32417');
2010 squareEl = $('#board .square-' + recommended_move.to);
2011 squareEl.addClass('highlight1-32417');
2016 var mouseupSquare = function(e) {
2017 if (reverse_dragging_from === null) {
2020 var source = $(this).attr('data-square');
2021 var target = reverse_dragging_from;
2022 reverse_dragging_from = null;
2023 if (onDrop(source, target) !== 'snapback') {
2024 onSnapEnd(source, target);
2026 $("#board").find('.square-55d63').removeClass('highlight1-32417');
2029 var get_best_move = function(game, source, target, invert) {
2030 var moves = game.moves({ verbose: true });
2031 if (source !== null) {
2032 moves = moves.filter(function(move) { return move.from == source; });
2034 if (target !== null) {
2035 moves = moves.filter(function(move) { return move.to == target; });
2037 if (moves.length == 0) {
2040 if (moves.length == 1) {
2044 // More than one move. Use the display lines (if we have them)
2045 // to disambiguate; otherwise, we have no information.
2047 for (var i = 0; i < moves.length; ++i) {
2048 move_hash[moves[i].san] = moves[i];
2051 // See if we're already exploring some line.
2052 if (current_display_line &&
2053 current_display_move < current_display_line.pv.length - 1) {
2054 var first_move = current_display_line.pv[current_display_move + 1];
2055 if (move_hash[first_move]) {
2056 return move_hash[first_move];
2060 // History and PV take priority over the display lines.
2061 for (var i = 0; i < 2; ++i) {
2062 var line = display_lines[i];
2063 var first_move = line.pv[line.start_display_move_num];
2064 if (move_hash[first_move]) {
2065 return move_hash[first_move];
2069 var best_move = null;
2070 var best_move_score = null;
2072 for (var move in refutation_lines) {
2073 var line = refutation_lines[move];
2074 if (!line['score']) {
2077 var first_move = line['pv'][0];
2078 if (move_hash[first_move]) {
2079 var score = compute_score_sort_key(line['score'], line['depth'], invert);
2080 if (best_move_score === null || score > best_move_score) {
2081 best_move = move_hash[first_move];
2082 best_move_score = score;
2089 var onDrop = function(source, target) {
2090 if (source === target) {
2091 if (recommended_move === null) {
2094 // Accept the move. It will be changed in onSnapEnd.
2098 // Suggestion not asked for.
2099 recommended_move = null;
2102 // see if the move is legal
2103 var pseudogame = new Chess(display_fen);
2104 var move = pseudogame.move({
2107 promotion: 'q' // NOTE: always promote to a queen for example simplicity
2111 if (move === null) return 'snapback';
2114 var onSnapEnd = function(source, target) {
2115 if (source === target && recommended_move !== null) {
2116 source = recommended_move.from;
2117 target = recommended_move.to;
2119 recommended_move = null;
2120 var pseudogame = new Chess(display_fen);
2121 var move = pseudogame.move({
2124 promotion: 'q' // NOTE: always promote to a queen for example simplicity
2127 if (current_display_line &&
2128 current_display_move < current_display_line.pv.length - 1 &&
2129 current_display_line.pv[current_display_move + 1] === move.san) {
2134 // Walk down the displayed lines until we find one that starts with
2135 // this move, then select that. Note that this gives us a good priority
2136 // order (history first, then PV, then multi-PV lines).
2137 for (var i = 0; i < display_lines.length; ++i) {
2138 if (i == 1 && current_display_line) {
2139 // Do not choose PV if not on it.
2142 var line = display_lines[i];
2143 if (line.pv[line.start_display_move_num] === move.san) {
2149 // Shouldn't really be here if we have hash probes, but there's really
2150 // nothing we can do.
2152 // End of dragging-related code.
2154 var fmt_cp = function(v) {
2158 return "+" + (v / 100).toFixed(2);
2161 return "-" + (v / 100).toFixed(2);
2165 var format_short_score = function(score) {
2169 if (score[0] === 'T' || score[0] === 't') {
2170 var ret = "TB\u00a0";
2171 if (score[2]) { // Is a bound.
2172 ret = score[2] + "\u00a0TB\u00a0";
2174 if (score[0] === 'T') {
2175 return ret + Math.ceil(score[1] / 2);
2177 return ret + "-" + Math.ceil(score[1] / 2);
2179 } else if (score[0] === 'M' || score[0] === 'm') {
2180 var sign = (score[0] === 'm') ? '-' : '';
2181 if (score[2]) { // Is a bound.
2182 return score[2] + "\u00a0M " + sign + score[1];
2184 return "M " + sign + score[1];
2186 } else if (score[0] === 'd') {
2188 } else if (score[0] === 'cp') {
2189 if (score[2]) { // Is a bound.
2190 return score[2] + "\u00a0" + fmt_cp(score[1]);
2192 return fmt_cp(score[1]);
2198 var format_long_score = function(score) {
2202 if (score[0] === 'T') {
2203 if (score[1] == 0) {
2204 return "Won for white (tablebase)";
2206 return "White wins in " + Math.ceil(score[1] / 2);
2208 } else if (score[0] === 't') {
2209 if (score[1] == -1) {
2210 return "Won for black (tablebase)";
2212 return "Black wins in " + Math.ceil(score[1] / 2);
2214 } else if (score[0] === 'M') {
2215 if (score[1] == 0) {
2216 return "White wins by checkmate";
2218 return "White mates in " + score[1];
2220 } else if (score[0] === 'm') {
2221 if (score[1] == 0) {
2222 return "Black wins by checkmate";
2224 return "Black mates in " + score[1];
2226 } else if (score[0] === 'd') {
2227 return "Theoretical draw";
2228 } else if (score[0] === 'cp') {
2229 return "Score: " + format_short_score(score);
2234 var compute_plot_score = function(score) {
2235 if (score[0] === 'M' || score[0] === 'T') {
2237 } else if (score[0] === 'm' || score[0] === 't') {
2239 } else if (score[0] === 'd') {
2241 } else if (score[0] === 'cp') {
2242 if (score[1] > 500) {
2244 } else if (score[1] < -500) {
2254 * @param score The score digest tuple.
2255 * @param {?number} depth Depth the move has been computed to, or null.
2256 * @param {boolean} invert Whether black is to play.
2257 * @param {boolean=} depth_secondary_key
2260 var compute_score_sort_key = function(score, depth, invert, depth_secondary_key) {
2265 if (score[0] === 'T') {
2266 // White reaches TB win.
2267 s = 89999 - score[1];
2268 } else if (score[0] === 't') {
2269 // Black reaches TB win.
2270 s = -(89999 - score[1]);
2271 } else if (score[0] === 'M') {
2273 s = 99999 - score[1];
2274 } else if (score[0] === 'm') {
2276 s = -(99999 - score[1]);
2277 } else if (score[0] === 'd') {
2279 } else if (score[0] === 'cp') {
2284 if (depth_secondary_key) {
2285 return s * 200 + (depth || 0);
2295 * @param {Object} game
2297 var switch_backend = function(game) {
2298 // Stop looking at historic data.
2299 current_display_line = null;
2300 current_display_move = null;
2301 displayed_analysis_data = null;
2302 if (current_historic_xhr) {
2303 current_historic_xhr.abort();
2306 // If we already have a backend response going, abort it.
2307 if (current_analysis_xhr) {
2308 current_analysis_xhr.abort();
2310 if (current_hash_xhr) {
2311 current_hash_xhr.abort();
2314 // Otherwise, we should have a timer going to start a new one.
2316 if (current_analysis_request_timer) {
2317 clearTimeout(current_analysis_request_timer);
2318 current_analysis_request_timer = null;
2320 if (current_hash_display_timer) {
2321 clearTimeout(current_hash_display_timer);
2322 current_hash_display_timer = null;
2325 // Request an immediate fetch with the new backend.
2326 backend_url = game['url'];
2327 backend_hash_url = game['hashurl'];
2328 window.location.hash = '#' + game['id'];
2329 current_analysis_data = null;
2333 window['switch_backend'] = switch_backend;
2335 window['flip'] = function() { board.flip(); redraw_arrows(); };
2336 window['set_delay_ms'] = function(ms) { delay_ms = ms; console.log('Delay is now ' + ms + ' ms.'); };
2338 // Mostly from Wikipedia's chess set as of October 2022, but some pieces are from
2339 // the 2013 version, as I like those better (and it matches the 2014 PNGs; nobody
2340 // really likes change, do they?). That is wK, bK, bQ. wQ is also slightly different,
2341 // but not enough to notice.
2342 const svg_pieces = {
2343 'wK': 'data:image/svg+xml;base64,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',
2344 'wQ': 'data:image/svg+xml;base64,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',
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2352 'bB': 'data:image/svg+xml;base64,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',
2353 'bN': 'data:image/svg+xml;base64,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',
2354 'bP': 'data:image/svg+xml;base64,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',
2357 var svg_piece_theme = function(piece) {
2358 return svg_pieces[piece];
2361 var init = function() {
2362 unique = get_unique();
2364 // Load settings from HTML5 local storage if available.
2365 if (supports_html5_storage() && localStorage['enable_sound']) {
2366 set_sound(parseInt(localStorage['enable_sound']));
2372 board = new window.ChessBoard('board', {
2373 onMoveEnd: function() { board_is_animating = false; },
2376 pieceTheme: svg_piece_theme,
2377 onDragStart: onDragStart,
2379 onSnapEnd: onSnapEnd
2381 $("#board").on('mousedown', '.square-55d63', mousedownSquare);
2382 $("#board").on('mouseup', '.square-55d63', mouseupSquare);
2385 $(window).resize(function() {
2387 update_sparkline(displayed_analysis_data || current_analysis_data);
2388 update_board_highlight();
2391 $(window).keyup(function(event) {
2392 if (event.which == 39) { // Left arrow.
2394 } else if (event.which == 37) { // Right arrow.
2396 } else if (event.which >= 49 && event.which <= 57) { // 1-9.
2397 var num = event.which - 49;
2398 if (current_games && current_games.length >= num) {
2399 switch_backend(current_games[num]);
2401 } else if (event.which == 78) { // N.
2405 window.addEventListener('hashchange', possibly_switch_game_from_hash, false);
2406 possibly_switch_game_from_hash();
2408 $(document).ready(init);