+ var min_score = -1;
+ var max_score = 1;
+ var last_score = null;
+ var scores = [];
+ for (var halfmove_num = first_move_num; halfmove_num <= last_move_num; ++halfmove_num) {
+ if (data['score_history'][halfmove_num]) {
+ var score = compute_plot_score(data['score_history'][halfmove_num]);
+ last_score = score;
+ if (score < min_score) min_score = score;
+ if (score > max_score) max_score = score;
+ }
+ scores.push(last_score);
+ }
+ if (data['score']) {
+ scores.push(compute_plot_score(data['score']));
+ }
+
+ const h = scorespark.getBoundingClientRect().height;
+
+ let base_y = h - h * min_score / (min_score - max_score);
+ for (let i = 0; i < scores.length; ++i) {
+ let rect = document.createElementNS('http://www.w3.org/2000/svg', 'rect');
+ //rect.setAttributeNS(null, 'stroke', "#000000");
+ rect.setAttributeNS(null, 'x', i * 5)
+ rect.setAttributeNS(null, 'width', 4);
+ let extent = scores[i] * h / (max_score - min_score);
+ if (extent > 0 && extent < 1) {
+ extent = 1;
+ } else if (extent < 0 && extent > -1) {
+ extent = -1;
+ }
+
+ let color;
+ if (scores[i] === 0) {
+ color = [0.5, 0.5, 0.5];
+ rect.setAttributeNS(null, 'y', base_y - 1);
+ rect.setAttributeNS(null, 'height', 1);
+ } else if (scores[i] > 0) {
+ color = [0.2, 0.4, 0.8];
+ rect.setAttributeNS(null, 'y', base_y - extent);
+ rect.setAttributeNS(null, 'height', extent);
+ } else {
+ color = [1.0, 0.267, 0.267];
+ rect.setAttributeNS(null, 'y', base_y);
+ rect.setAttributeNS(null, 'height', -extent);
+ }
+ let hlcolor = [color[0], color[1], color[2]];
+ if (scores[i] !== 0) {
+ hlcolor[0] = Math.min(hlcolor[0] * 1.4, 1.0);
+ hlcolor[1] = Math.min(hlcolor[1] * 1.4, 1.0);
+ hlcolor[2] = Math.min(hlcolor[2] * 1.4, 1.0);
+ }
+ rect.style.fill = 'rgb(' + color[0]*100.0 + '%, ' + color[1]*100.0 + '%, ' + color[2]*100.0 + '%)';
+
+ // score_history contains the Nth _position_, but format_tooltip
+ // wants to format the Nth _move_; thus the -1.
+ const tooltip = format_tooltip(data, i + first_move_num - 1);
+ rect.addEventListener('mouseenter', (e) => draw_hover(e, hlcolor, tooltip));
+ rect.addEventListener('mousemove', (e) => draw_hover(e, hlcolor, tooltip));
+ rect.addEventListener('mouseleave', (e) => hide_hover(e, color));
+ rect.addEventListener('click', (e) => show_line(0, i + first_move_num - 1));
+ scorespark.appendChild(rect);
+ }
+ }
+ }
+}
+
+var draw_hover = function(e, color, tooltip) {
+ e.target.style.fill = 'rgb(' + color[0]*100.0 + '%, ' + color[1]*100.0 + '%, ' + color[2]*100.0 + '%)';
+
+ let hover = document.getElementById('sparklinehover');
+ hover.textContent = tooltip;
+ hover.style.display = 'initial';
+
+ let left = Math.max(e.pageX + 10, window.pageXOffset);
+ let top = Math.max(e.pageY - hover.getBoundingClientRect().height, window.pageYOffset);
+ left = Math.min(left, window.pageXOffset + document.documentElement.clientWidth - hover.getBoundingClientRect().width);
+
+ hover.style.left = left + 'px';
+ hover.style.top = top + 'px';
+
+}
+var hide_hover = function(e, color) {
+ e.target.style.fill = 'rgb(' + color[0]*100.0 + '%, ' + color[1]*100.0 + '%, ' + color[2]*100.0 + '%)';
+ document.getElementById('sparklinehover').style.display = 'none';
+}
+
+/**
+ * @param {number} num_viewers
+ */
+var update_num_viewers = function(num_viewers) {
+ var text = "";
+ if (num_viewers === null) {
+ text = "";
+ } else if (num_viewers == 1) {
+ text = "You are the only current viewer";
+ } else {
+ text = num_viewers + " current viewers";
+ }
+ if (display_fen !== null) {
+ var counter = Math.floor(display_fen.split(" ")[4] / 2);
+ if (counter >= 20) {
+ text = text.replace("current ", "");
+ text += " | 50-move rule: " + counter;
+ }
+ }
+ document.getElementById("numviewers").textContent = text;
+}
+
+var update_clock = function() {
+ clearTimeout(clock_timer);
+
+ var data = displayed_analysis_data || current_analysis_data;
+ if (!data) return;
+
+ if (data['position']) {
+ var result = data['position']['result'];
+ if (result === '1-0') {
+ document.getElementById("whiteclock").textContent = "1";
+ document.getElementById("blackclock").textContent = "0";
+ document.getElementById("whiteclock").classList.remove("running-clock");
+ document.getElementById("blackclock").classList.remove("running-clock");
+ return;
+ }
+ if (result === '1/2-1/2') {
+ document.getElementById("whiteclock").textContent = "1/2";
+ document.getElementById("blackclock").textContent = "1/2";
+ document.getElementById("whiteclock").classList.remove("running-clock");
+ document.getElementById("blackclock").classList.remove("running-clock");
+ return;
+ }
+ if (result === '0-1') {
+ document.getElementById("whiteclock").textContent = "0";
+ document.getElementById("blackclock").textContent = "1";
+ document.getElementById("whiteclock").classList.remove("running-clock");
+ document.getElementById("blackclock").classList.remove("running-clock");
+ return;
+ }
+ }
+
+ var white_clock_ms = null;
+ var black_clock_ms = null;
+
+ // Static clocks.
+ if (data['position'] &&
+ data['position']['white_clock'] &&
+ data['position']['black_clock']) {
+ white_clock_ms = data['position']['white_clock'] * 1000;
+ black_clock_ms = data['position']['black_clock'] * 1000;
+ }
+
+ // Dynamic clock (only one, obviously).
+ var color;
+ if (data['position']['white_clock_target']) {
+ color = "white";
+ document.getElementById("whiteclock").classList.add("running-clock");
+ document.getElementById("blackclock").classList.remove("running-clock");
+ } else if (data['position']['black_clock_target']) {
+ color = "black";
+ document.getElementById("whiteclock").classList.remove("running-clock");
+ document.getElementById("blackclock").classList.add("running-clock");
+ } else {
+ document.getElementById("whiteclock").classList.remove("running-clock");
+ document.getElementById("blackclock").classList.remove("running-clock");
+ }
+ var remaining_ms;
+ if (color) {
+ var now = new Date().getTime() + client_clock_offset_ms;
+ remaining_ms = data['position'][color + '_clock_target'] * 1000 - now;
+ if (color === "white") {
+ white_clock_ms = remaining_ms;
+ } else {
+ black_clock_ms = remaining_ms;
+ }
+ }
+
+ if (white_clock_ms === null || black_clock_ms === null) {
+ document.getElementById("whiteclock").replaceChildren();
+ document.getElementById("blackclock").replaceChildren();
+ return;
+ }
+
+ // If either player has twenty minutes or less left, add the second counters.
+ // This matches what DGT clocks do.
+ var show_seconds = (white_clock_ms < 60 * 20 * 1000 || black_clock_ms < 60 * 20 * 1000);
+
+ if (color) {
+ // See when the clock will change next, and update right after that.
+ var next_update_ms;
+ if (show_seconds) {
+ next_update_ms = remaining_ms % 1000 + 100;
+ } else {
+ next_update_ms = remaining_ms % 60000 + 100;
+ }
+ clock_timer = setTimeout(update_clock, next_update_ms);
+ }
+
+ document.getElementById("whiteclock").textContent = format_clock(white_clock_ms, show_seconds);
+ document.getElementById("blackclock").textContent = format_clock(black_clock_ms, show_seconds);
+}
+
+/**
+ * @param {Number} remaining_ms
+ * @param {boolean} show_seconds
+ */
+var format_clock = function(remaining_ms, show_seconds) {
+ if (remaining_ms <= 0) {
+ if (show_seconds) {
+ return "00:00:00";
+ } else {
+ return "00:00";
+ }
+ }
+
+ var remaining = Math.floor(remaining_ms / 1000);
+ var seconds = remaining % 60;
+ remaining = (remaining - seconds) / 60;
+ var minutes = remaining % 60;
+ remaining = (remaining - minutes) / 60;
+ var hours = remaining;
+ if (show_seconds) {
+ return format_2d(hours) + ":" + format_2d(minutes) + ":" + format_2d(seconds);
+ } else {
+ return format_2d(hours) + ":" + format_2d(minutes);
+ }
+}
+
+/**
+ * @param {Number} x
+ */
+var format_2d = function(x) {
+ if (x >= 10) {
+ return x;
+ } else {
+ return "0" + x;
+ }
+}
+
+/**
+ * @param {string} move
+ * @param {Number} move_num Move number of this move.
+ * @param {boolean} white_to_play Whether white is to play this move.
+ */
+var format_move_with_number = function(move, move_num, white_to_play) {
+ var ret;
+ if (white_to_play) {
+ ret = move_num + '. ';
+ } else {
+ ret = move_num + '… ';
+ }
+ ret += move;
+ return ret;
+}
+
+/**
+ * @param {string} move
+ * @param {Number} halfmove_num Half-move number that is to be played,
+ * starting from 0.
+ */
+var format_halfmove_with_number = function(move, halfmove_num) {
+ return format_move_with_number(
+ move,
+ Math.floor(halfmove_num / 2) + 1,
+ halfmove_num % 2 == 0);
+}
+
+/**
+ * @param {Object} data
+ * @param {Number} halfmove_num
+ */
+var format_tooltip = function(data, halfmove_num) {
+ if (data['score_history'][halfmove_num + 1] ||
+ (halfmove_num + 1) === data['position']['history'].length) {
+ // Position is in the history, or it is the current position
+ // (which is implicitly tacked onto the history).
+ var move;
+ var short_score;
+ if ((halfmove_num + 1) === data['position']['history'].length) {
+ move = data['position']['last_move'];
+ short_score = format_short_score(data['score']);
+ } else {
+ move = data['position']['history'][halfmove_num];
+ short_score = format_short_score(data['score_history'][halfmove_num + 1]);
+ }
+ if (halfmove_num === -1) {
+ return "Start position: " + short_score;
+ } else {
+ var move_with_number = format_halfmove_with_number(move, halfmove_num);
+ return "After " + move_with_number + ": " + short_score;
+ }
+ } else {
+ for (var i = halfmove_num; i --> -1; ) {
+ if (data['score_history'][i]) {
+ var move = data['position']['history'][i];
+ if (i === -1) {
+ return "[Analysis kept from start position]";
+ } else {
+ return "[Analysis kept from " + format_halfmove_with_number(move, i) + "]";
+ }
+ }
+ }
+ }
+}
+
+/**
+ * @param {boolean} truncate_history
+ */
+var set_truncate_history = function(truncate_history) {
+ truncate_display_history = truncate_history;
+ update_refutation_lines();
+}
+window['set_truncate_history'] = set_truncate_history;
+
+/**
+ * @param {number} line_num
+ * @param {number} move_num
+ */
+var show_line = function(line_num, move_num) {
+ if (line_num == -1) {
+ current_display_line = null;
+ current_display_move = null;
+ hash_refutation_lines = null;
+ if (displayed_analysis_data) {
+ // TODO: Support exiting to history position if we are in an
+ // analysis line of a history position.
+ displayed_analysis_data = null;
+ }
+ update_board();
+ return;
+ } else {
+ current_display_line = {...display_lines[line_num]}; // Shallow clone.
+ current_display_move = move_num + current_display_line.start_display_move_num;
+ }
+ current_display_line_is_history = (line_num == 0);
+
+ update_historic_analysis();
+ update_displayed_line();
+ update_board_highlight();
+ update_move_highlight();
+ redraw_arrows();
+}
+window['show_line'] = show_line;
+
+var prev_move = function() {
+ if (current_display_line &&
+ current_display_move >= current_display_line.start_display_move_num) {
+ --current_display_move;
+ }
+ update_historic_analysis();
+ update_displayed_line();
+ update_move_highlight();
+}
+window['prev_move'] = prev_move;
+
+var next_move = function() {
+ if (current_display_line &&
+ current_display_move < current_display_line.pv.length - 1) {
+ ++current_display_move;
+ }
+ update_historic_analysis();
+ update_displayed_line();
+ update_move_highlight();
+}
+window['next_move'] = next_move;
+
+var next_game = function() {
+ if (current_games === null) {
+ return;
+ }
+
+ // Try to find the game we are currently looking at.
+ for (var game_num = 0; game_num < current_games.length; ++game_num) {
+ var game = current_games[game_num];
+ if (game['url'] === backend_url) {
+ var next_game_num = (game_num + 1) % current_games.length;
+ switch_backend(current_games[next_game_num]);
+ return;
+ }
+ }
+
+ // Couldn't find it; give up.
+}
+
+var update_historic_analysis = function() {
+ if (!current_display_line_is_history) {
+ return;
+ }
+ if (current_display_move == current_display_line.pv.length - 1) {
+ displayed_analysis_data = null;
+ update_board();
+ }
+
+ // Fetch old analysis for this line if it exists.
+ var hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move);
+ var filename = "/history/move" + (current_display_move + 1) + "-" +
+ hiddenboard.fen().replace(/ /g, '_').replace(/\//g, '-') + ".json";
+
+ let handle_err = () => {
+ displayed_analysis_data = {'failed': true};
+ update_board();
+ };
+
+ current_historic_xhr = new AbortController();
+ const signal = current_analysis_xhr.signal;
+ fetch(filename, { signal })
+ .then((response) => response.json().then(data => ({ok: response.ok, json: data}))) // ick
+ .then((obj) => {
+ if (!obj.ok) {
+ handle_err();
+ return;
+ }
+ displayed_analysis_data = obj.json;
+ update_board();
+ })
+ .catch((err) => {
+ if (err.name === 'AbortError') {
+ // Aborted because we are switching backends. Abandon and don't retry,
+ // because another one is already started for us.
+ } else {
+ console.log(err);
+ handle_err();
+ }
+ });
+}
+
+/**
+ * @param {string} fen
+ */
+var update_imbalance = function(fen) {
+ var hiddenboard = new Chess(fen);
+ var imbalance = {'k': 0, 'q': 0, 'r': 0, 'b': 0, 'n': 0, 'p': 0};
+ for (var row = 0; row < 8; ++row) {
+ for (var col = 0; col < 8; ++col) {
+ var col_text = String.fromCharCode('a1'.charCodeAt(0) + col);
+ var row_text = String.fromCharCode('a1'.charCodeAt(1) + row);
+ var square = col_text + row_text;
+ var contents = hiddenboard.get(square);
+ if (contents !== null) {
+ if (contents.color === 'w') {
+ ++imbalance[contents.type];
+ } else {
+ --imbalance[contents.type];
+ }
+ }
+ }
+ }
+ var white_imbalance = '';
+ var black_imbalance = '';
+ for (var piece in imbalance) {
+ for (var i = 0; i < imbalance[piece]; ++i) {
+ white_imbalance += '<img src="' + svg_pieces['w' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-piece">';
+ white_imbalance += '<img src="' + svg_pieces['b' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-inverted-piece">';
+ }
+ for (var i = 0; i < -imbalance[piece]; ++i) {
+ black_imbalance += '<img src="' + svg_pieces['b' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-piece">';
+ black_imbalance += '<img src="' + svg_pieces['w' + piece.toUpperCase()] + '" alt="" style="width: 15px;height: 15px;" class="imbalance-inverted-piece">';
+ }
+ }
+ document.getElementById('whiteimbalance').innerHTML = white_imbalance;
+ document.getElementById('blackimbalance').innerHTML = black_imbalance;
+}
+
+/** Mark the currently selected move in red.
+ * Also replaces the PV with the current displayed line if it's not shown
+ * anywhere else on the screen.
+ */
+var update_move_highlight = function() {
+ if (highlighted_move !== null) {
+ highlighted_move.classList.remove('highlight');
+ }
+ if (current_display_line) {
+ var display_line_num = find_display_line_matching_num();
+ if (display_line_num === null) {
+ // Replace the PV with the (complete) line.
+ document.getElementById("pvtitle").textContent = "Exploring:";
+ current_display_line.start_display_move_num = 0;
+ display_lines.push(current_display_line);
+ document.getElementById("pv").innerHTML = print_pv(display_lines.length - 1, null); // FIXME
+ display_line_num = display_lines.length - 1;
+
+ // Clear out the PV, so it's not selected by anything later.
+ display_lines[1].pv = [];
+ }
+
+ highlighted_move = document.getElementById("automove" + display_line_num + "-" + (current_display_move - current_display_line.start_display_move_num));
+ if (highlighted_move !== null) {
+ highlighted_move.classList.add('highlight');
+ }
+ }
+}
+
+/**
+ * See if the current displayed line is identical to any of the ones
+ * we have on screen. (It might not be if e.g. the analysis reloaded
+ * since we started looking.)
+ *
+ * @return {?number}
+ */
+var find_display_line_matching_num = function() {
+ for (var i = 0; i < display_lines.length; ++i) {
+ var line = display_lines[i];
+ if (line.start_display_move_num > 0) continue;
+ if (current_display_line.start_fen !== line.start_fen) continue;
+ if (current_display_line.pv.length !== line.pv.length) continue;
+ var ok = true;
+ for (var j = 0; j < line.pv.length; ++j) {
+ if (current_display_line.pv[j] !== line.pv[j]) {
+ ok = false;
+ break;
+ }
+ }
+ if (ok) {
+ return i;
+ }
+ }
+ return null;
+}
+
+/** Update the board based on the currently displayed line.
+ *
+ * TODO: This should really be called only whenever something changes,
+ * instead of all the time.
+ */
+var update_displayed_line = function() {
+ if (current_display_line === null) {
+ document.getElementById("linenav").style.display = 'none';
+ document.getElementById("linemsg").style.display = 'revert';
+ display_fen = base_fen;
+ set_board_position(base_fen);
+ update_imbalance(base_fen);
+ return;
+ }
+
+ document.getElementById("linenav").style.display = 'revert';
+ document.getElementById("linemsg").style.display = 'none';
+
+ if (current_display_move <= 0) {
+ document.getElementById("prevmove").innerHTML = "Previous";
+ } else {
+ document.getElementById("prevmove").innerHTML = "<a href=\"javascript:prev_move();\">Previous</a></span>";
+ }
+ if (current_display_move == current_display_line.pv.length - 1) {
+ document.getElementById("nextmove").innerHTML = "Next";
+ } else {
+ document.getElementById("nextmove").innerHTML = "<a href=\"javascript:next_move();\">Next</a></span>";
+ }
+
+ var hiddenboard = chess_from(current_display_line.start_fen, current_display_line.pv, current_display_move);
+ set_board_position(hiddenboard.fen());
+ if (display_fen !== hiddenboard.fen() && !current_display_line_is_history) {
+ // Fire off a hash request, since we're now off the main position
+ // and it just changed.
+ explore_hash(hiddenboard.fen());
+ }
+ display_fen = hiddenboard.fen();
+ update_imbalance(hiddenboard.fen());
+}
+
+var set_board_position = function(new_fen) {
+ board_is_animating = true;
+ var old_fen = board.fen();
+ board.position(new_fen);
+ if (board.fen() === old_fen) {
+ board_is_animating = false;
+ }
+}
+
+/**
+ * @param {boolean} param_enable_sound
+ */
+var set_sound = function(param_enable_sound) {
+ enable_sound = param_enable_sound;
+ if (enable_sound) {
+ document.getElementById("soundon").innerHTML = "<strong>On</strong>";
+ document.getElementById("soundoff").innerHTML = "<a href=\"javascript:set_sound(false)\">Off</a>";
+
+ // Seemingly at least Firefox prefers MP3 over Opus; tell it otherwise,
+ // and also preload the file since the user has selected audio.
+ var ding = document.getElementById('ding');
+ if (ding && ding.canPlayType && ding.canPlayType('audio/ogg; codecs="opus"') === 'probably') {
+ ding.src = 'ding.opus';
+ ding.load();
+ }
+ } else {
+ document.getElementById("soundon").innerHTML = "<a href=\"javascript:set_sound(true)\">On</a>";
+ document.getElementById("soundoff").innerHTML = "<strong>Off</strong>";
+ }
+ if (supports_html5_storage()) {
+ window['localStorage']['enable_sound'] = enable_sound ? 1 : 0;
+ }
+}
+window['set_sound'] = set_sound;
+
+/** Send off a hash probe request to the backend.
+ * @param {string} fen
+ */
+var explore_hash = function(fen) {
+ // If we already have a backend response going, abort it.
+ if (current_hash_xhr) {
+ current_hash_xhr.abort();
+ }
+ if (current_hash_display_timer) {
+ clearTimeout(current_hash_display_timer);
+ current_hash_display_timer = null;
+ }
+ document.getElementById("refutationlines").replaceChildren();
+
+ current_hash_xhr = new AbortController();
+ const signal = current_analysis_xhr.signal;
+ fetch(backend_hash_url + "?fen=" + fen, { signal })
+ .then((response) => response.json())
+ .then((data) => { show_explore_hash_results(data, fen); })
+ .catch((err) => {});
+}
+
+/** Process the JSON response from a hash probe request.
+ * @param {!Object} data
+ * @param {string} fen
+ */
+var show_explore_hash_results = function(data, fen) {
+ if (board_is_animating) {
+ // Updating while the animation is still going causes
+ // the animation to jerk. This is pretty crude, but it will do.
+ current_hash_display_timer = setTimeout(function() { show_explore_hash_results(data, fen); }, 100);
+ return;
+ }
+ current_hash_display_timer = null;
+ hash_refutation_lines = data['lines'];
+ update_board();
+}
+
+// almost all of this stuff comes from the chessboard.js example page
+var onDragStart = function(source, piece, position, orientation) {
+ var pseudogame = new Chess(display_fen);
+ if (pseudogame.game_over() === true ||
+ (pseudogame.turn() === 'w' && piece.search(/^b/) !== -1) ||
+ (pseudogame.turn() === 'b' && piece.search(/^w/) !== -1)) {
+ return false;
+ }
+
+ recommended_move = get_best_move(pseudogame, source, null, pseudogame.turn() === 'b');
+ if (recommended_move) {
+ var squareEl = document.querySelector('#board .square-' + recommended_move.to);
+ squareEl.classList.add('highlight1-32417');
+ }
+ return true;
+}
+
+var mousedownSquare = function(e) {
+ if (!e.target || !e.target.matches('.square-55d63')) {
+ return;
+ }
+
+ reverse_dragging_from = null;
+ var square = e.target.getAttribute('data-square');
+
+ var pseudogame = new Chess(display_fen);
+ if (pseudogame.game_over() === true) {
+ return;
+ }
+
+ // If the square is empty, or has a piece of the side not to move,
+ // we handle it. If not, normal piece dragging will take it.
+ var position = board.position();
+ if (!position.hasOwnProperty(square) ||
+ (pseudogame.turn() === 'w' && position[square].search(/^b/) !== -1) ||
+ (pseudogame.turn() === 'b' && position[square].search(/^w/) !== -1)) {
+ reverse_dragging_from = square;
+ recommended_move = get_best_move(pseudogame, null, square, pseudogame.turn() === 'b');
+ if (recommended_move) {
+ var squareEl = document.querySelector('#board .square-' + recommended_move.from);
+ squareEl.classList.add('highlight1-32417');
+ squareEl = document.querySelector('#board .square-' + recommended_move.to);
+ squareEl.classList.add('highlight1-32417');
+ }
+ }
+}
+
+var mouseupSquare = function(e) {
+ if (!e.target || !e.target.matches('.square-55d63')) {
+ return;
+ }
+ if (reverse_dragging_from === null) {
+ return;
+ }
+ var source = e.target.getAttribute('data-square');
+ var target = reverse_dragging_from;
+ reverse_dragging_from = null;
+ if (onDrop(source, target) !== 'snapback') {
+ onSnapEnd(source, target);
+ }
+ document.getElementById("board").querySelectorAll('.square-55d63.highlight1-32417').forEach((square) => {
+ square.classList.remove('highlight1-32417');
+ });
+}
+
+var get_best_move = function(game, source, target, invert) {
+ var moves = game.moves({ verbose: true });
+ if (source !== null) {
+ moves = moves.filter(function(move) { return move.from == source; });
+ }
+ if (target !== null) {
+ moves = moves.filter(function(move) { return move.to == target; });
+ }
+ if (moves.length == 0) {
+ return null;
+ }
+ if (moves.length == 1) {
+ return moves[0];
+ }
+
+ // More than one move. Use the display lines (if we have them)
+ // to disambiguate; otherwise, we have no information.
+ var move_hash = {};
+ for (var i = 0; i < moves.length; ++i) {
+ move_hash[moves[i].san] = moves[i];
+ }
+
+ // See if we're already exploring some line.
+ if (current_display_line &&
+ current_display_move < current_display_line.pv.length - 1) {
+ var first_move = current_display_line.pv[current_display_move + 1];
+ if (move_hash[first_move]) {
+ return move_hash[first_move];
+ }
+ }
+
+ // History and PV take priority over the display lines.
+ for (var i = 0; i < 2; ++i) {
+ var line = display_lines[i];
+ var first_move = line.pv[line.start_display_move_num];
+ if (move_hash[first_move]) {
+ return move_hash[first_move];
+ }
+ }
+
+ var best_move = null;
+ var best_move_score = null;
+
+ for (var move in refutation_lines) {
+ var line = refutation_lines[move];
+ if (!line['score']) {
+ continue;
+ }
+ var first_move = line['pv'][0];
+ if (move_hash[first_move]) {
+ var score = compute_score_sort_key(line['score'], line['depth'], invert);
+ if (best_move_score === null || score > best_move_score) {
+ best_move = move_hash[first_move];
+ best_move_score = score;
+ }
+ }
+ }
+ return best_move;
+}
+
+var onDrop = function(source, target) {
+ if (source === target) {
+ if (recommended_move === null) {
+ return 'snapback';
+ } else {
+ // Accept the move. It will be changed in onSnapEnd.
+ return;
+ }
+ } else {
+ // Suggestion not asked for.
+ recommended_move = null;
+ }
+
+ // see if the move is legal
+ var pseudogame = new Chess(display_fen);
+ var move = pseudogame.move({
+ from: source,
+ to: target,
+ promotion: 'q' // NOTE: always promote to a queen for example simplicity
+ });
+
+ // illegal move
+ if (move === null) return 'snapback';
+}
+
+var onSnapEnd = function(source, target) {
+ if (source === target && recommended_move !== null) {
+ source = recommended_move.from;
+ target = recommended_move.to;
+ }
+ recommended_move = null;
+ var pseudogame = new Chess(display_fen);
+ var move = pseudogame.move({
+ from: source,
+ to: target,
+ promotion: 'q' // NOTE: always promote to a queen for example simplicity
+ });
+
+ if (current_display_line &&
+ current_display_move < current_display_line.pv.length - 1 &&
+ current_display_line.pv[current_display_move + 1] === move.san) {
+ next_move();
+ return;
+ }
+
+ // Walk down the displayed lines until we find one that starts with
+ // this move, then select that. Note that this gives us a good priority
+ // order (history first, then PV, then multi-PV lines).
+ for (var i = 0; i < display_lines.length; ++i) {
+ if (i == 1 && current_display_line) {
+ // Do not choose PV if not on it.
+ continue;
+ }
+ var line = display_lines[i];
+ if (line.pv[line.start_display_move_num] === move.san) {
+ show_line(i, 0);
+ return;
+ }
+ }
+
+ // Shouldn't really be here if we have hash probes, but there's really
+ // nothing we can do.
+}
+// End of dragging-related code.
+
+var fmt_cp = function(v) {
+ if (v === 0) {
+ return "0.00";
+ } else if (v > 0) {
+ return "+" + (v / 100).toFixed(2);
+ } else {
+ v = -v;
+ return "-" + (v / 100).toFixed(2);
+ }
+}
+
+var format_short_score = function(score) {
+ if (!score) {
+ return "???";
+ }
+ if (score[0] === 'T' || score[0] === 't') {
+ var ret = "TB\u00a0";
+ if (score[2]) { // Is a bound.
+ ret = score[2] + "\u00a0TB\u00a0";
+ }
+ if (score[0] === 'T') {
+ return ret + Math.ceil(score[1] / 2);
+ } else {
+ return ret + "-" + Math.ceil(score[1] / 2);
+ }
+ } else if (score[0] === 'M' || score[0] === 'm') {
+ var sign = (score[0] === 'm') ? '-' : '';
+ if (score[2]) { // Is a bound.
+ return score[2] + "\u00a0M " + sign + score[1];
+ } else {
+ return "M " + sign + score[1];
+ }
+ } else if (score[0] === 'd') {
+ return "TB =0";
+ } else if (score[0] === 'cp') {
+ if (score[2]) { // Is a bound.
+ return score[2] + "\u00a0" + fmt_cp(score[1]);
+ } else {
+ return fmt_cp(score[1]);
+ }
+ }
+ return null;
+}
+
+var format_long_score = function(score) {
+ if (!score) {
+ return "???";
+ }
+ if (score[0] === 'T') {
+ if (score[1] == 0) {
+ return "Won for white (tablebase)";
+ } else {
+ return "White wins in " + Math.ceil(score[1] / 2);
+ }
+ } else if (score[0] === 't') {
+ if (score[1] == -1) {
+ return "Won for black (tablebase)";
+ } else {
+ return "Black wins in " + Math.ceil(score[1] / 2);
+ }
+ } else if (score[0] === 'M') {
+ if (score[1] == 0) {
+ return "White wins by checkmate";
+ } else {
+ return "White mates in " + score[1];
+ }
+ } else if (score[0] === 'm') {
+ if (score[1] == 0) {
+ return "Black wins by checkmate";
+ } else {
+ return "Black mates in " + score[1];
+ }
+ } else if (score[0] === 'd') {
+ return "Theoretical draw";
+ } else if (score[0] === 'cp') {
+ return "Score: " + format_short_score(score);
+ }
+ return null;
+}
+
+var compute_plot_score = function(score) {
+ if (score[0] === 'M' || score[0] === 'T') {
+ return 500;
+ } else if (score[0] === 'm' || score[0] === 't') {
+ return -500;
+ } else if (score[0] === 'd') {
+ return 0;
+ } else if (score[0] === 'cp') {
+ if (score[1] > 500) {
+ return 500;
+ } else if (score[1] < -500) {
+ return -500;
+ } else {
+ return score[1];
+ }
+ }
+ return null;
+}
+
+/**
+ * @param score The score digest tuple.
+ * @param {?number} depth Depth the move has been computed to, or null.
+ * @param {boolean} invert Whether black is to play.
+ * @param {boolean=} depth_secondary_key
+ * @return {number}
+ */
+var compute_score_sort_key = function(score, depth, invert, depth_secondary_key) {
+ var s;
+ if (!score) {
+ return -10000000;
+ }
+ if (score[0] === 'T') {
+ // White reaches TB win.
+ s = 89999 - score[1];
+ } else if (score[0] === 't') {
+ // Black reaches TB win.
+ s = -(89999 - score[1]);
+ } else if (score[0] === 'M') {
+ // White mates.
+ s = 99999 - score[1];
+ } else if (score[0] === 'm') {
+ // Black mates.
+ s = -(99999 - score[1]);
+ } else if (score[0] === 'd') {
+ s = 0;
+ } else if (score[0] === 'cp') {
+ s = score[1];
+ }
+ if (s) {
+ if (invert) s = -s;
+ if (depth_secondary_key) {
+ return s * 200 + (depth || 0);
+ } else {
+ return s;
+ }
+ } else {
+ return null;
+ }
+}
+
+/**
+ * @param {Object} game
+ */
+var switch_backend = function(game) {
+ // Stop looking at historic data.
+ current_display_line = null;
+ current_display_move = null;
+ displayed_analysis_data = null;
+ if (current_historic_xhr) {
+ current_historic_xhr.abort();
+ }
+
+ // If we already have a backend response going, abort it.
+ if (current_analysis_xhr) {
+ current_analysis_xhr.abort();
+ }
+ if (current_hash_xhr) {
+ current_hash_xhr.abort();
+ }
+
+ // Otherwise, we should have a timer going to start a new one.
+ // Kill that, too.
+ if (current_analysis_request_timer) {
+ clearTimeout(current_analysis_request_timer);
+ current_analysis_request_timer = null;
+ }
+ if (current_hash_display_timer) {
+ clearTimeout(current_hash_display_timer);
+ current_hash_display_timer = null;
+ }
+
+ // Request an immediate fetch with the new backend.
+ backend_url = game['url'];
+ backend_hash_url = game['hashurl'];
+ window.location.hash = '#' + game['id'];
+ current_analysis_data = null;
+ ims = 0;
+ request_update();
+}
+window['switch_backend'] = switch_backend;
+
+window['flip'] = function() { board.flip(); redraw_arrows(); };
+window['set_delay_ms'] = function(ms) { delay_ms = ms; console.log('Delay is now ' + ms + ' ms.'); };
+
+// Mostly from Wikipedia's chess set as of October 2022, but some pieces are from
+// the 2013 version, as I like those better (and it matches the 2014 PNGs; nobody
+// really likes change, do they?). That is wK, bK, bQ. wQ is also slightly different,
+// but not enough to notice.
+const svg_pieces = {
+ 'wK': '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/><path d=%22M 20,8 L 25,8%22 style=%22fill:none;stroke:%23000000;stroke-linejoin:miter%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:%23ffffff;stroke:%23000000;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:%23ffffff;stroke:%23000000%22/><path d=%22M 11.5,30 C 17,27 27,27 32.5,30%22 style=%22fill:none;stroke:%23000000%22/><path d=%22M 11.5,33.5 C 17,30.5 27,30.5 32.5,33.5%22 style=%22fill:none;stroke:%23000000%22/><path d=%22M 11.5,37 C 17,34 27,34 32.5,37%22 style=%22fill:none;stroke:%23000000%22/></g></svg>',
+ 'wQ': '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:%23ffffff;stroke:%23000000;stroke-width:1.5;stroke-linejoin:round%22><path d=%22M 9,26 C 17.5,24.5 30,24.5 36,26 L 38.5,13.5 L 31,25 L 30.7,10.9 L 25.5,24.5 L 22.5,10 L 19.5,24.5 L 14.3,10.9 L 14,25 L 6.5,13.5 L 9,26 z%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 11,36 11,36 C 9.5,37.5 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/><path d=%22M 11.5,30 C 15,29 30,29 33.5,30%22 style=%22fill:none%22/><path d=%22M 12,33.5 C 18,32.5 27,32.5 33,33.5%22 style=%22fill:none%22/><circle cx=%226%22 cy=%2212%22 r=%222%22/><circle cx=%2214%22 cy=%229%22 r=%222%22/><circle cx=%2222.5%22 cy=%228%22 r=%222%22/><circle cx=%2231%22 cy=%229%22 r=%222%22/><circle cx=%2239%22 cy=%2212%22 r=%222%22/></g></svg>',
+ 'wR': '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:%23ffffff;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 12,36 L 12,32 L 33,32 L 33,36 L 12,36 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%22 style=%22stroke-linecap:butt%22/><path d=%22M 34,14 L 31,17 L 14,17 L 11,14%22/><path d=%22M 31,17 L 31,29.5 L 14,29.5 L 14,17%22 style=%22stroke-linecap:butt;stroke-linejoin:miter%22/><path d=%22M 31,29.5 L 32.5,32 L 12.5,32 L 14,29.5%22/><path d=%22M 11,14 L 34,14%22 style=%22fill:none;stroke:%23000000;stroke-linejoin:miter%22/></g></svg>',
+ 'wB': '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:%23ffffff;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:%23000000;stroke-linejoin:miter%22/></g></svg>',
+ 'wN': '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:%23ffffff;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:%23ffffff;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:%23000000;stroke:%23000000%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:%23000000;stroke:%23000000%22/></g></svg>',
+ '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>',
+ '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>',
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+ '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>',
+ '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>',
+ '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>',
+ '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>',
+};
+
+var svg_piece_theme = function(piece) {
+ return svg_pieces[piece];
+}
+
+var init = function() {
+ unique = get_unique();
+
+ // Load settings from HTML5 local storage if available.
+ if (supports_html5_storage() && window['localStorage']['enable_sound']) {
+ set_sound(parseInt(window['localStorage']['enable_sound']));
+ } else {
+ set_sound(false);
+ }
+
+ // Create board.
+ board = new window.ChessBoard('board', {
+ onMoveEnd: function() { board_is_animating = false; },
+
+ draggable: true,
+ pieceTheme: svg_piece_theme,
+ onDragStart: onDragStart,
+ onDrop: onDrop,
+ onSnapEnd: onSnapEnd
+ });
+ document.getElementById("board").addEventListener('mousedown', mousedownSquare);
+ document.getElementById("board").addEventListener('mouseup', mouseupSquare);
+
+ request_update();
+ window.addEventListener('resize', function() {
+ board.resize();
+ update_sparkline(displayed_analysis_data || current_analysis_data);
+ update_board_highlight();
+ redraw_arrows();
+ });
+ window.addEventListener('keyup', function(event) {
+ if (event.which == 39) { // Left arrow.
+ next_move();
+ } else if (event.which == 37) { // Right arrow.
+ prev_move();
+ } else if (event.which >= 49 && event.which <= 57) { // 1-9.
+ var num = event.which - 49;
+ if (current_games && current_games.length >= num) {
+ switch_backend(current_games[num]);
+ }
+ } else if (event.which == 78) { // N.
+ next_game();
+ }
+ });
+ window.addEventListener('hashchange', possibly_switch_game_from_hash, false);
+ possibly_switch_game_from_hash();
+};
+document.addEventListener('DOMContentLoaded', init);
+
+})();