In <title>, there is nothing to align, so remove the funny-looking space.
[remoteglot] / www / js / remoteglot.js
index 5ce7426..a37fede 100644 (file)
@@ -3,8 +3,22 @@
 /** @type {window.ChessBoard} @private */
 var board = null;
 
-/** @type {window.ChessBoard} @private */
-var hiddenboard = null;
+/**
+ * The most recent analysis data we have from the server
+ * (about the most recent position).
+ *
+ * @type {?Object}
+ * @private */
+var current_analysis_data = null;
+
+/**
+ * If we are displaying previous analysis, this is non-null,
+ * and will override most of current_analysis_data.
+ *
+ * @type {?Object}
+ * @private
+ */
+var displayed_analysis_data = null;
 
 /** @type {Array.<{
  *      from_col: number,
@@ -36,14 +50,23 @@ var ims = 0;
 /** @type {boolean} @private */
 var sort_refutation_lines_by_score = true;
 
+/** @type {boolean} @private */
+var truncate_display_history = true;
+
 /** @type {!string|undefined} @private */
 var highlight_from = undefined;
 
 /** @type {!string|undefined} @private */
 var highlight_to = undefined;
 
-/** @type {!number} @private */
-var unique = Math.random();
+/** @type {?jQuery} @private */
+var highlighted_move = null;
+
+/** @type {?number} @private */
+var unique = null;
+
+/** @type {boolean} @private */
+var enable_sound = false;
 
 /** The current position on the board, represented as a FEN string.
  * @type {?string}
@@ -54,7 +77,8 @@ var fen = null;
 /** @typedef {{
  *    start_fen: string,
  *    uci_pv: Array.<string>,
- *    pretty_pv: Array.<string>
+ *    pretty_pv: Array.<string>,
+ *    line_num: number
  * }} DisplayLine
  */
 
@@ -66,23 +90,71 @@ var display_lines = [];
 /** @type {?DisplayLine} @private */
 var current_display_line = null;
 
+/** @type {boolean} @private */
+var current_display_line_is_history = false;
+
 /** @type {?number} @private */
 var current_display_move = null;
 
+var supports_html5_storage = function() {
+       try {
+               return 'localStorage' in window && window['localStorage'] !== null;
+       } catch (e) {
+               return false;
+       }
+}
+
+// Make the unique token persistent so people refreshing the page won't count twice.
+// Of course, you can never fully protect against people deliberately wanting to spam.
+var get_unique = function() {
+       var use_local_storage = supports_html5_storage();
+       if (use_local_storage && localStorage['unique']) {
+               return localStorage['unique'];
+       }
+       var unique = Math.random();
+       if (use_local_storage) {
+               localStorage['unique'] = unique;
+       }
+       return unique;
+}
+
 var request_update = function() {
        $.ajax({
-               url: "http://analysis.sesse.net/analysis.pl?ims=" + ims + "&unique=" + unique
-               //url: "http://analysis.sesse.net:5000/analysis.pl?ims=" + ims + "&unique=" + unique
+               url: "/analysis.pl?ims=" + ims + "&unique=" + unique
        }).done(function(data, textstatus, xhr) {
                ims = xhr.getResponseHeader('X-Remoteglot-Last-Modified');
                var num_viewers = xhr.getResponseHeader('X-Remoteglot-Num-Viewers');
-               update_board(data, num_viewers);
+               possibly_play_sound(current_analysis_data, data);
+               current_analysis_data = data;
+               update_board(current_analysis_data, displayed_analysis_data);
+               update_num_viewers(num_viewers);
+
+               // Next update.
+               setTimeout(function() { request_update(); }, 100);
        }).fail(function() {
                // Wait ten seconds, then try again.
                setTimeout(function() { request_update(); }, 10000);
        });
 }
 
+var possibly_play_sound = function(old_data, new_data) {
+       if (!enable_sound) {
+               return;
+       }
+       if (old_data === null) {
+               return;
+       }
+       var ding = document.getElementById('ding');
+       if (ding && ding.play !== undefined) {
+               if (old_data['position'] && old_data['position']['fen'] &&
+                   new_data['position'] && new_data['position']['fen'] &&
+                   (old_data['position']['fen'] !== new_data['position']['fen'] ||
+                    old_data['position']['move_num'] !== new_data['position']['move_num'])) {
+                       ding.play();
+               }
+       }
+}
+
 var clear_arrows = function() {
        for (var i = 0; i < arrows.length; ++i) {
                if (arrows[i].svg) {
@@ -204,7 +276,7 @@ var position_arrow = function(arrow) {
                arrow.svg.parentElement.removeChild(arrow.svg);
                delete arrow.svg;
        }
-       if (current_display_line !== null) {
+       if (current_display_line !== null && !current_display_line_is_history) {
                return;
        }
 
@@ -372,33 +444,55 @@ var thousands = function(x) {
 
 /**
  * @param {!string} fen
- * @param {Array.<string>} uci_pv
  * @param {Array.<string>} pretty_pv
  * @param {number} move_num
  * @param {!string} toplay
  * @param {number=} opt_limit
+ * @param {boolean=} opt_showlast
  */
-var print_pv = function(fen, uci_pv, pretty_pv, move_num, toplay, opt_limit) {
+var add_pv = function(fen, pretty_pv, move_num, toplay, opt_limit, opt_showlast) {
        display_lines.push({
                start_fen: fen,
-               uci_pv: uci_pv,
-               pretty_pv: pretty_pv 
+               pretty_pv: pretty_pv,
+               line_number: display_lines.length
        });
+       return print_pv(display_lines.length - 1, pretty_pv, move_num, toplay, opt_limit, opt_showlast);
+}
 
+/**
+ * @param {number} line_num
+ * @param {Array.<string>} pretty_pv
+ * @param {number} move_num
+ * @param {!string} toplay
+ * @param {number=} opt_limit
+ * @param {boolean=} opt_showlast
+ */
+var print_pv = function(line_num, pretty_pv, move_num, toplay, opt_limit, opt_showlast) {
        var pv = '';
        var i = 0;
-       if (toplay == 'B') {
-               var move = "<a class=\"move\" href=\"javascript:show_line(" + (display_lines.length - 1) + ", " + 0 + ");\">" + pretty_pv[0] + "</a>";
+       if (opt_limit && opt_showlast && pretty_pv.length > opt_limit) {
+               // Truncate the PV at the beginning (instead of at the end).
+               // We assume here that toplay is 'W'. We also assume that if
+               // opt_showlast is set, then it is the history, and thus,
+               // the UI should be to expand the history.
+               pv = '(<a class="move" href="javascript:collapse_history(false)">…</a>) ';
+               i = pretty_pv.length - opt_limit;
+               if (i % 2 == 1) {
+                       ++i;
+               }
+               move_num += i / 2;
+       } else if (toplay == 'B' && pretty_pv.length > 0) {
+               var move = "<a class=\"move\" id=\"automove" + line_num + "-0\" href=\"javascript:show_line(" + line_num + ", " + 0 + ");\">" + pretty_pv[0] + "</a>";
                pv = move_num + '. … ' + move;
                toplay = 'W';
                ++i;
                ++move_num;
        }
        for ( ; i < pretty_pv.length; ++i) {
-               var move = "<a class=\"move\" href=\"javascript:show_line(" + (display_lines.length - 1) + ", " + i + ");\">" + pretty_pv[i] + "</a>";
+               var move = "<a class=\"move\" id=\"automove" + line_num + "-" + i + "\" href=\"javascript:show_line(" + line_num + ", " + i + ");\">" + pretty_pv[i] + "</a>";
 
                if (toplay == 'W') {
-                       if (i > opt_limit) {
+                       if (i > opt_limit && !opt_showlast) {
                                return pv + ' (…)';
                        }
                        if (pv != '') {
@@ -417,18 +511,40 @@ var print_pv = function(fen, uci_pv, pretty_pv, move_num, toplay, opt_limit) {
 
 var update_highlight = function() {
        $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
-       if (current_display_line === null && highlight_from !== undefined && highlight_to !== undefined) {
+       if ((current_display_line === null || current_display_line_is_history) &&
+           highlight_from !== undefined && highlight_to !== undefined) {
                $("#board").find('.square-' + highlight_from).addClass('nonuglyhighlight');
                $("#board").find('.square-' + highlight_to).addClass('nonuglyhighlight');
        }
 }
 
+var update_history = function() {
+       if (display_lines[0] === null || display_lines[0].pretty_pv.length == 0) {
+               $("#history").html("No history");
+       } else if (truncate_display_history) {
+               $("#history").html(print_pv(0, display_lines[0].pretty_pv, 1, 'W', 8, true));
+       } else {
+               $("#history").html(
+                       '(<a class="move" href="javascript:collapse_history(true)">collapse</a>) ' +
+                       print_pv(0, display_lines[0].pretty_pv, 1, 'W'));
+       }
+}
+
+/**
+ * @param {!boolean} truncate_history
+ */
+var collapse_history = function(truncate_history) {
+       truncate_display_history = truncate_history;
+       update_history();
+}
+window['collapse_history'] = collapse_history;
+
 var update_refutation_lines = function() {
        if (fen === null) {
                return;
        }
-       if (display_lines.length > 1) {
-               display_lines = [ display_lines[0] ];
+       if (display_lines.length > 2) {
+               display_lines = [ display_lines[0], display_lines[1] ];
        }
 
        var tbl = $("#refutationlines");
@@ -448,7 +564,7 @@ var update_refutation_lines = function() {
                var move_td = document.createElement("td");
                tr.appendChild(move_td);
                $(move_td).addClass("move");
-               if (line['pv_uci'].length == 0) {
+               if (line['pv_pretty'].length == 0) {
                        $(move_td).text(line['pretty_move']);
                } else {
                        var move = "<a class=\"move\" href=\"javascript:show_line(" + display_lines.length + ", " + 0 + ");\">" + line['pretty_move'] + "</a>";
@@ -468,7 +584,7 @@ var update_refutation_lines = function() {
                var pv_td = document.createElement("td");
                tr.appendChild(pv_td);
                $(pv_td).addClass("pv");
-               $(pv_td).html(print_pv(fen, line['pv_uci'], line['pv_pretty'], move_num, toplay, 10));
+               $(pv_td).html(add_pv(fen, line['pv_pretty'], move_num, toplay, 10));
 
                tbl.append(tr);
        }
@@ -485,37 +601,100 @@ var update_refutation_lines = function() {
 
 /**
  * @param {Object} data
- * @param {number} num_viewers
+ * @param {?Object} display_data
  */
-var update_board = function(data, num_viewers) {
+var update_board = function(current_data, display_data) {
+       var data = display_data || current_data;
+
        display_lines = [];
 
-       // The headline.
+       // Print the history. This is pretty much the only thing that's
+       // unconditionally taken from current_data (we're not interested in
+       // historic history).
+       if (current_data['position']['pretty_history']) {
+               add_pv('start', current_data['position']['pretty_history'], 1, 'W', 8, true);
+       } else {
+               display_lines.push(null);
+       }
+       update_history();
+
+       // The headline. Names are always fetched from current_data;
+       // the rest can depend a bit.
        var headline;
-       if (data['position']['player_w'] && data['position']['player_b']) {
-               headline = data['position']['player_w'] + '–' +
-                       data['position']['player_b'] + ', analysis';
+       if (current_data &&
+           current_data['position']['player_w'] && current_data['position']['player_b']) {
+               headline = current_data['position']['player_w'] + '–' +
+                       current_data['position']['player_b'] + ', analysis';
        } else {
                headline = 'Analysis';
        }
-       if (data['position']['last_move'] !== 'none') {
-               headline += ' after '
-               if (data['position']['toplay'] == 'W') {
-                       headline += (data['position']['move_num']-1) + '… ';
-               } else {
-                       headline += data['position']['move_num'] + '. ';
-               }
-               headline += data['position']['last_move'];
-       }
 
+       var last_move;
+       if (display_data) {
+               // Displaying some non-current position, pick out the last move
+               // from the history. This will work even if the fetch failed.
+               last_move = format_move_with_number(
+                       current_display_line.pretty_pv[current_display_move],
+                       Math.floor((current_display_move + 1) / 2) + 1,
+                       (current_display_move % 2 == 1));
+               headline += ' after ' + last_move;
+       } else if (data['position']['last_move'] !== 'none') {
+               last_move = format_move_with_number(
+                       data['position']['last_move'],
+                       data['position']['move_num'],
+                       data['position']['toplay'] == 'W');
+               headline += ' after ' + last_move;
+       } else {
+               last_move = null;
+       }
        $("#headline").text(headline);
 
-       if (num_viewers === null) {
-               $("#numviewers").text("");
-       } else if (num_viewers == 1) {
-               $("#numviewers").text("You are the only current viewer");
+       // The <title> contains a very brief headline.
+       var title_elems = [];
+       if (data['short_score'] !== undefined && data['short_score'] !== null) {
+               title_elems.push(data['short_score'].replace(/^ /, ""));
+       }
+       if (last_move !== null) {
+               title_elems.push(last_move);
+       }
+
+       if (title_elems.length != 0) {
+               document.title = '(' + title_elems.join(', ') + ') analysis.sesse.net';
        } else {
-               $("#numviewers").text(num_viewers + " current viewers");
+               document.title = 'analysis.sesse.net';
+       }
+
+       // The last move (shown by highlighting the from and to squares).
+       if (data['position'] && data['position']['last_move_uci']) {
+               highlight_from = data['position']['last_move_uci'].substr(0, 2);
+               highlight_to = data['position']['last_move_uci'].substr(2, 2);
+       } else if (current_display_line_is_history && current_display_move >= 0) {
+               // We don't have historic analysis for this position, but we
+               // can reconstruct what the last move was by just replaying
+               // from the start.
+               var hiddenboard = new Chess();
+               for (var i = 0; i <= current_display_move; ++i) {
+                       hiddenboard.move(current_display_line.pretty_pv[i]);
+               }
+               var moves = hiddenboard.history({ verbose: true });
+               var last_move = moves.pop();
+               highlight_from = last_move.from;
+               highlight_to = last_move.to;
+       } else {
+               highlight_from = highlight_to = undefined;
+       }
+       update_highlight();
+
+       if (data['failed']) {
+               $("#score").text("No analysis for this move");
+               $("#pv").empty();
+               $("#searchstats").html("&nbsp;");
+               $("#refutationlines").empty();
+               refutation_lines = [];
+               update_refutation_lines();
+               clear_arrows();
+               update_displayed_line();
+               return;
        }
 
        // The engine id.
@@ -529,7 +708,9 @@ var update_board = function(data, num_viewers) {
        }
 
        // The search stats.
-       if (data['nodes'] && data['nps'] && data['depth']) {
+       if (data['tablebase'] == 1) {
+               $("#searchstats").text("Tablebase result");
+       } else if (data['nodes'] && data['nps'] && data['depth']) {
                var stats = thousands(data['nodes']) + ' nodes, ' + thousands(data['nps']) + ' nodes/sec, depth ' + data['depth'] + ' ply';
                if (data['seldepth']) {
                        stats += ' (' + data['seldepth'] + ' selective)';
@@ -543,22 +724,16 @@ var update_board = function(data, num_viewers) {
                }
 
                $("#searchstats").text(stats);
+       } else {
+               $("#searchstats").text("");
        }
 
        // Update the board itself.
        fen = data['position']['fen'];
        update_displayed_line();
 
-       if (data['position']['last_move_uci']) {
-               highlight_from = data['position']['last_move_uci'].substr(0, 2);
-               highlight_to = data['position']['last_move_uci'].substr(2, 4);
-       } else {
-               highlight_from = highlight_to = undefined;
-       }
-       update_highlight();
-
        // Print the PV.
-       $("#pv").html(print_pv(data['position']['fen'], data['pv_uci'], data['pv_pretty'], data['position']['move_num'], data['position']['toplay']));
+       $("#pv").html(add_pv(data['position']['fen'], data['pv_pretty'], data['position']['move_num'], data['position']['toplay']));
 
        // Update the PV arrow.
        clear_arrows();
@@ -567,7 +742,7 @@ var update_board = function(data, num_viewers) {
                for (var i = 0; i < data['pv_uci'].length; i += 2) {
                        var from = data['pv_uci'][i].substr(0, 2);
                        var to = data['pv_uci'][i].substr(2,4);
-                       if ((i >= 2 && from != data['pv_uci'][i - 2].substr(2, 4)) ||
+                       if ((i >= 2 && from != data['pv_uci'][i - 2].substr(2, 2)) ||
                             interfering_arrow(from, to)) {
                                break;
                        }
@@ -577,7 +752,7 @@ var update_board = function(data, num_viewers) {
                var alt_moves = find_nonstupid_moves(data, 30);
                for (var i = 1; i < alt_moves.length && i < 3; ++i) {
                        create_arrow(alt_moves[i].substr(0, 2),
-                                    alt_moves[i].substr(2, 4), '#f66', 1, 10);
+                                    alt_moves[i].substr(2, 2), '#f66', 1, 10);
                }
        }
 
@@ -608,7 +783,7 @@ var update_board = function(data, num_viewers) {
 
                if (nonstupid_moves.length > 0 && response !== undefined) {
                        create_arrow(response.substr(0, 2),
-                                    response.substr(2, 4), '#66f', 6, 20);
+                                    response.substr(2, 2), '#66f', 6, 20);
                }
        }
 
@@ -618,9 +793,35 @@ var update_board = function(data, num_viewers) {
        toplay = data['position']['toplay'];
        refutation_lines = data['refutation_lines'];
        update_refutation_lines();
+}
+
+/**
+ * @param {number} num_viewers
+ */
+var update_num_viewers = function(num_viewers) {
+       if (num_viewers === null) {
+               $("#numviewers").text("");
+       } else if (num_viewers == 1) {
+               $("#numviewers").text("You are the only current viewer");
+       } else {
+               $("#numviewers").text(num_viewers + " current viewers");
+       }
+}
 
-       // Next update.
-       setTimeout(function() { request_update(); }, 100);
+/**
+ * @param {string} move
+ * @param {Number} move_num
+ * @param {boolean} white_to_play
+ */
+var format_move_with_number = function(move, move_num, white_to_play) {
+       var ret;
+       if (white_to_play) {
+               ret = (move_num - 1) + '… ';
+       } else {
+               ret = move_num + '. ';
+       }
+       ret += move;
+       return ret;
 }
 
 /**
@@ -628,10 +829,22 @@ var update_board = function(data, num_viewers) {
  */
 var resort_refutation_lines = function(sort_by_score) {
        sort_refutation_lines_by_score = sort_by_score;
+       if (supports_html5_storage()) {
+               localStorage['sort_refutation_lines_by_score'] = sort_by_score ? 1 : 0;
+       }
        update_refutation_lines();
 }
 window['resort_refutation_lines'] = resort_refutation_lines;
 
+/**
+ * @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
@@ -640,10 +853,19 @@ var show_line = function(line_num, move_num) {
        if (line_num == -1) {
                current_display_line = null;
                current_display_move = 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(current_analysis_data, displayed_analysis_data);
+               }
        } else {
                current_display_line = display_lines[line_num];
                current_display_move = move_num;
        }
+       current_display_line_is_history = (line_num == 0);
+
+       update_historic_analysis();
        update_displayed_line();
        update_highlight();
        redraw_arrows();
@@ -651,18 +873,55 @@ var show_line = function(line_num, move_num) {
 window['show_line'] = show_line;
 
 var prev_move = function() {
-       --current_display_move;
+       if (current_display_move > -1) {
+               --current_display_move;
+       }
+       update_historic_analysis();
        update_displayed_line();
 }
 window['prev_move'] = prev_move;
 
 var next_move = function() {
-       ++current_display_move;
+       if (current_display_line && current_display_move < current_display_line.pretty_pv.length - 1) {
+               ++current_display_move;
+       }
+       update_historic_analysis();
        update_displayed_line();
 }
 window['next_move'] = next_move;
 
+var update_historic_analysis = function() {
+       if (!current_display_line_is_history) {
+               return;
+       }
+       if (current_display_move == current_display_line.pretty_pv.length - 1) {
+               displayed_analysis_data = null;
+               update_board(current_analysis_data, displayed_analysis_data);
+       }
+
+       // Fetch old analysis for this line if it exists.
+       var hiddenboard = new Chess();
+       for (var i = 0; i <= current_display_move; ++i) {
+               hiddenboard.move(current_display_line.pretty_pv[i]);
+       }
+       var filename = "/history/move" + (current_display_move + 1) + "-" +
+               hiddenboard.fen().replace(/ /g, '_').replace(/\//g, '-') + ".json";
+
+       $.ajax({
+               url: filename
+       }).done(function(data, textstatus, xhr) {
+               displayed_analysis_data = data;
+               update_board(current_analysis_data, displayed_analysis_data);
+       }).fail(function() {
+               displayed_analysis_data = {'failed': true};
+               update_board(current_analysis_data, displayed_analysis_data);
+       });
+}
+
 var update_displayed_line = function() {
+       if (highlighted_move !== null) {
+               highlighted_move.removeClass('highlight'); 
+       }
        if (current_display_line === null) {
                $("#linenav").hide();
                $("#linemsg").show();
@@ -673,42 +932,64 @@ var update_displayed_line = function() {
        $("#linenav").show();
        $("#linemsg").hide();
 
-       if (current_display_move == 0) {
+       if (current_display_move <= 0) {
                $("#prevmove").html("Previous");
        } else {
                $("#prevmove").html("<a href=\"javascript:prev_move();\">Previous</a></span>");
        }
-       if (current_display_move == current_display_line.uci_pv.length - 1) {
+       if (current_display_move == current_display_line.pretty_pv.length - 1) {
                $("#nextmove").html("Next");
        } else {
                $("#nextmove").html("<a href=\"javascript:next_move();\">Next</a></span>");
        }
 
-       hiddenboard.position(current_display_line.start_fen, false);
+       var hiddenboard = new Chess();
+       hiddenboard.load(current_display_line.start_fen);
        for (var i = 0; i <= current_display_move; ++i) {
-               var move = current_display_line.uci_pv[i];
-               move = move.substr(0, 2) + "-" + move.substr(2, 4);
-               hiddenboard.move(move, false);
-
-               // chessboard.js does not automatically move the rook on castling
-               // (issue #51; marked as won't fix), so update it ourselves.
-               if (move == "e1-g1" && hiddenboard.position().g1 == "wK") {  // white O-O
-                       hiddenboard.move("h1-f1", false);
-               } else if (move == "e1-c1" && hiddenboard.position().c1 == "wK") {  // white O-O-O
-                       hiddenboard.move("a1-d1", false);
-               } else if (move == "e8-g8" && hiddenboard.position().g8 == "bK") {  // black O-O
-                       hiddenboard.move("h8-f8", false);
-               } else if (move == "e8-c8" && hiddenboard.position().c8 == "bK") {  // black O-O-O
-                       hiddenboard.move("a8-d8", false);
-               }
+               hiddenboard.move(current_display_line.pretty_pv[i]);
        }
-       board.position(hiddenboard.position());
+
+       highlighted_move = $("#automove" + current_display_line.line_number + "-" + current_display_move);
+       highlighted_move.addClass('highlight'); 
+
+       board.position(hiddenboard.fen());
 }
 
+/**
+ * @param {boolean} param_enable_sound
+ */
+var set_sound = function(param_enable_sound) {
+       enable_sound = param_enable_sound;
+       if (enable_sound) {
+               $("#soundon").html("<strong>On</strong>");
+               $("#soundoff").html("<a href=\"javascript:set_sound(false)\">Off</a>");
+       } else {
+               $("#soundon").html("<a href=\"javascript:set_sound(true)\">On</a>");
+               $("#soundoff").html("<strong>Off</strong>");
+       }
+       if (supports_html5_storage()) {
+               localStorage['enable_sound'] = enable_sound ? 1 : 0;
+       }
+}
+window['set_sound'] = set_sound;
+
 var init = function() {
+       unique = get_unique();
+
+       // Load settings from HTML5 local storage if available.
+       if (supports_html5_storage() && localStorage['enable_sound']) {
+               set_sound(parseInt(localStorage['enable_sound']));
+       } else {
+               set_sound(false);
+       }
+       if (supports_html5_storage() && localStorage['sort_refutation_lines_by_score']) {
+               sort_refutation_lines_by_score = parseInt(localStorage['sort_refutation_lines_by_score']);
+       } else {
+               sort_refutation_lines_by_score = true;
+       }
+
        // Create board.
        board = new window.ChessBoard('board', 'start');
-       hiddenboard = new window.ChessBoard('hiddenboard', 'start');
 
        request_update();
        $(window).resize(function() {