Move the JavaScript into an external file.
authorSteinar H. Gunderson <sgunderson@bigfoot.com>
Mon, 18 Nov 2013 21:12:47 +0000 (22:12 +0100)
committerSteinar H. Gunderson <sgunderson@bigfoot.com>
Mon, 18 Nov 2013 21:12:47 +0000 (22:12 +0100)
www/index.html
www/js/remoteglot.js [new file with mode: 0644]

index cda85c7..a22c6c0 100644 (file)
 <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.9.2/jquery-ui.min.js"></script>
 <script type="text/javascript" src="js/jquery.jsPlumb-1.5.3-min.js"></script>
 <script type="text/javascript" src="js/chessboard-0.3.0.min.js"></script>
-<script>
-var arrows = [];
-var arrow_targets = [];
-var occupied_by_arrows = [];
-
-var request_update = function(board, first) {
-       $.ajax({
-               //url: "http://analysis.sesse.net/analysis.pl?first=" + first
-               url: "http://analysis.sesse.net:5000/analysis.pl?first=" + first
-       }).done(function(data) {
-               update_board(board, data);
-       });
-}
-
-var clear_arrows = function() {
-       for (var i = 0; i < arrows.length; ++i) {
-               jsPlumb.detach(arrows[i]);
-       }
-       arrows = [];
-
-       for (var i = 0; i < arrow_targets.length; ++i) {
-               document.body.removeChild(arrow_targets[i]);
-       }
-       arrow_targets = [];
-       
-       occupied_by_arrows = [];        
-       for (var y = 0; y < 8; ++y) {
-               occupied_by_arrows.push([false, false, false, false, false, false, false, false]);
-       }
-}
-
-var sign = function(x) {
-       if (x > 0) {
-               return 1;
-       } else if (x < 0) {
-               return -1;
-       } else {
-               return 0;
-       }
-}
-
-// See if drawing this arrow on the board would cause unduly amount of confusion.
-var interfering_arrow = function(from, to) {
-       var from_col = from.charCodeAt(0) - "a1".charCodeAt(0);
-       var from_row = from.charCodeAt(1) - "a1".charCodeAt(1);
-       var to_col   = to.charCodeAt(0) - "a1".charCodeAt(0);
-       var to_row   = to.charCodeAt(1) - "a1".charCodeAt(1);
-
-       occupied_by_arrows[from_row][from_col] = true;
-
-       // Knight move: Just check that we haven't been at the destination before.
-       if ((Math.abs(to_col - from_col) == 2 && Math.abs(to_row - from_row) == 1) ||
-           (Math.abs(to_col - from_col) == 1 && Math.abs(to_row - from_row) == 2)) {
-               return occupied_by_arrows[to_row][to_col];
-       }
-
-       // Sliding piece: Check if anything except the from-square is seen before.
-       var dx = sign(to_col - from_col);
-       var dy = sign(to_row - from_row);
-       var x = from_col;
-       var y = from_row;
-       do {
-               x += dx;
-               y += dy;
-               if (occupied_by_arrows[y][x]) {
-                       return true;
-               }
-               occupied_by_arrows[y][x] = true;
-       } while (x != to_col || y != to_row);
-
-       return false;
-}
-
-var add_target = function() {
-       var elem = document.createElement("div");
-       $(elem).addClass("window");
-       elem.id = "target" + arrow_targets.length;
-       document.body.appendChild(elem);        
-       arrow_targets.push(elem);
-       return elem.id;
-}
-
-var create_arrow = function(from_square, to_square, fg_color, line_width, arrow_size) {
-       var from_col = from_square.charCodeAt(0) - "a1".charCodeAt(0);
-       var from_row = from_square.charCodeAt(1) - "a1".charCodeAt(1);
-       var to_col   = to_square.charCodeAt(0) - "a1".charCodeAt(0);
-       var to_row   = to_square.charCodeAt(1) - "a1".charCodeAt(1);
-
-       var from_y = (7 - from_row)*49 + 25;
-       var to_y = (7 - to_row)*49 + 25;
-       var from_x = from_col*49 + 25;
-       var to_x = to_col*49 + 25;
-
-       var dx = to_x - from_x;
-       var dy = to_y - from_y;
-       var len = Math.sqrt(dx * dx + dy * dy);
-       dx /= len;
-       dy /= len;
-
-       // Create arrow.
-       var s1 = add_target();
-       var d1 = add_target();
-       var s1v = add_target();
-       var d1v = add_target();
-       var pos = $("#board").position();
-       $("#" + s1).css({ top: pos.top + from_y + (0.5 * arrow_size) * dy, left: pos.left + from_x + (0.5 * arrow_size) * dx });
-       $("#" + d1).css({ top: pos.top + to_y - (0.5 * arrow_size) * dy, left: pos.left + to_x - (0.5 * arrow_size) * dx });
-       $("#" + s1v).css({ top: pos.top + from_y - 0 * dy, left: pos.left + from_x - 0 * dx });
-       $("#" + d1v).css({ top: pos.top + to_y + 0 * dy, left: pos.left + to_x + 0 * dx });
-       var connection1 = jsPlumb.connect({
-               source: s1,
-               target: d1,
-               connector:["Straight"],
-               cssClass:"c1",
-               endpoint:"Blank",
-               endpointClass:"c1Endpoint",                                                                                                        
-               anchor:"Continuous",
-               paintStyle:{ 
-                       lineWidth:line_width,
-                       strokeStyle:fg_color,
-                       outlineWidth:1,
-                       outlineColor:"#666",
-                       opacity:"60%"
-               }
-       });            
-       var connection2 = jsPlumb.connect({
-               source: s1v,
-               target: d1v,
-               connector:["Straight"],
-               cssClass:"vir",
-               endpoint:"Blank",
-               endpointClass:"c1Endpoint",                                                                                                        
-               anchor:"Continuous",
-               paintStyle:{ 
-                       lineWidth:0,
-                       strokeStyle:fg_color,
-                       outlineWidth:0,
-                       outlineColor:"#666",
-               },
-               overlays : [
-                       ["Arrow", {
-                               cssClass:"l1arrow",
-                               location:1.0,
-                               width: arrow_size, length: arrow_size,
-                               paintStyle:{ 
-                                       lineWidth:line_width,
-                                       strokeStyle:"#000",
-                               },
-                       }]
-               ]
-       });
-       arrows.push(connection1);
-       arrows.push(connection2);
-}
-
-// Fake multi-PV using the refutation lines. Find all “relevant” moves,
-// sorted by quality, descending.
-var find_nonstupid_moves = function(data, margin) {
-       // First of all, if there are any moves that are more than 0.5 ahead of
-       // the primary move, the refutation lines are probably bunk, so just
-       // kill them all. 
-       var best_score = undefined;
-       var pv_score = undefined;
-       for (var move in data.refutation_lines) {
-               var score = data.refutation_lines[move].score_sort_key;
-               if (move == data.pv_uci[0]) {
-                       pv_score = score;
-               }
-               if (best_score === undefined || score > best_score) {
-                       best_score = score;
-               }
-               if (!(data.refutation_lines[move].depth >= 8)) {
-                       return [];
-               }
-       }
-
-       if (best_score - pv_score > 50) {
-               return [];
-       }
-
-       // Now find all moves that are within “margin” of the best score.
-       // The PV move will always be first.
-       var moves = [];
-       for (var move in data.refutation_lines) {
-               var score = data.refutation_lines[move].score_sort_key;
-               if (move != data.pv_uci[0] && best_score - score <= margin) {
-                       moves.push(move);
-               }
-       }
-       moves = moves.sort(function(a, b) { return data.refutation_lines[b].score_sort_key - data.refutation_lines[a].score_sort_key; });
-       moves.unshift(data.pv_uci[0]);
-
-       return moves;
-}
-
-var thousands = function(x) {
-       return String(x).split('').reverse().join('').replace(/(\d{3}\B)/g, '$1,').split('').reverse().join('');
-}
-
-var print_pv = function(pretty_pv, move_num, toplay, limit) {
-       var pv = '';
-       var i = 0;
-       if (toplay == 'B') {
-               pv = move_num + '. … ' + pretty_pv[0];
-               toplay = 'W';
-               ++i;    
-       }
-       ++move_num;
-       for ( ; i < pretty_pv.length; ++i) {
-               if (toplay == 'W') {
-                       if (i > limit) {
-                               return pv + ' (…)';
-                       }
-                       if (pv != '') {
-                               pv += ' ';
-                       }
-                       pv += move_num + '. ' + pretty_pv[i];
-                       ++move_num;
-                       toplay = 'B';
-               } else {
-                       pv += ' ' + pretty_pv[i];
-                       toplay = 'W';
-               }
-       }
-       return pv;
-}
-
-var compare_by_sort_key = function(data, a, b) {
-       var ska = data.refutation_lines[a].sort_key;
-       var skb = data.refutation_lines[b].sort_key;
-       if (ska < skb) return -1;
-       if (ska > skb) return 1;
-       return 0;
-};
-
-var update_board = function(board, data) {
-       // The headline.
-       var headline = 'Analysis';
-       if (data.position.last_move !== 'none') {
-               headline += ' after ' + data.position.move_num + '. ';
-               if (data.position.toplay == 'W') {
-                       headline += '… ';
-               }
-               headline += data.position.last_move;
-               if (data.id.name) {
-                       headline += ', ';
-               }
-       }
-
-       if (data.id.name) {
-               headline += ' by ' + data.id.name;  // + ':';
-       } else {
-               //headline += ':';
-       }
-       $("#headline").text(headline);
-
-       // The score.
-       if (data.score !== null) {
-               $("#score").text(data.score);
-       }
-
-       // The search stats.
-       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)';
-               }
-               if (data.tbhits && data.tbhits > 0) {
-                       if (data.tbhits == 1) {
-                               stats += ', one Nalimov hit';
-                       } else {
-                               stats += ', ' + data.tbhits + ' Nalimov hits';
-                       }
-               }
-               
-
-               $("#searchstats").text(stats);
-       }
-
-       // Update the board itself.
-       board.position(data.position.fen);
-
-       $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
-       if (data.position.last_move_uci) {
-               var from = data.position.last_move_uci.substr(0, 2);
-               var to = data.position.last_move_uci.substr(2, 4);
-               $("#board").find('.square-' + from).addClass('nonuglyhighlight');
-               $("#board").find('.square-' + to).addClass('nonuglyhighlight');
-       }
-
-       // Print the PV.
-       var pv = print_pv(data.pv_pretty, data.position.move_num, data.position.toplay);
-       $("#pv").text(pv);
-
-       // Update the PV arrow.
-       clear_arrows();
-       if (data.pv_uci.length >= 1) {
-               // draw a continuation arrow as long as it's the same piece
-               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)) ||
-                            interfering_arrow(from, to)) {
-                               break;
-                       }
-                       create_arrow(from, to, '#f66', 6, 20);
-               }
-
-               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);
-               }
-       }
-
-       // See if all semi-reasonable moves have only one possible response.
-       if (data.pv_uci.length >= 2) {
-               var nonstupid_moves = find_nonstupid_moves(data, 300);
-               var response = data.pv_uci[1];
-               for (var i = 0; i < nonstupid_moves.length; ++i) {
-                       if (nonstupid_moves[i] == data.pv_uci[0]) {
-                               // ignore the PV move for refutation lines.
-                               continue;
-                       }
-                       if (!data.refutation_lines ||
-                           !data.refutation_lines[nonstupid_moves[i]] ||
-                           !data.refutation_lines[nonstupid_moves[i]].pv_uci ||
-                           data.refutation_lines[nonstupid_moves[i]].pv_uci.length < 1) {
-                               // Incomplete PV, abort.
-                               response = undefined;
-                               break;
-                       }
-                       var this_response = data.refutation_lines[nonstupid_moves[i]].pv_uci[1];
-                       if (response !== this_response) {
-                               // Different response depending on lines, abort.
-                               response = undefined;
-                               break;
-                       }
-               }
-
-               if (nonstupid_moves.length > 0 && response !== undefined) {
-                       create_arrow(response.substr(0, 2),
-                                    response.substr(2, 4), '#66f', 6, 20);
-               }
-       }
-
-       // Show the refutation lines.
-       var tbl = $("#refutationlines");
-       tbl.empty();
-
-       moves = [];
-       for (var move in data.refutation_lines) {
-               moves.push(move);
-       }
-       moves = moves.sort(function(a, b) { return compare_by_sort_key(data, a, b) });
-       for (var i = 0; i < moves.length; ++i) {
-               var line = data.refutation_lines[moves[i]];
-
-               var tr = document.createElement("tr");
-
-               var move_td = document.createElement("td");
-               tr.appendChild(move_td);
-               $(move_td).addClass("move");
-               $(move_td).text(line.pretty_move);
-
-               var score_td = document.createElement("td");
-               tr.appendChild(score_td);
-               $(score_td).addClass("score");
-               $(score_td).text(line.pretty_score);
-
-               var depth_td = document.createElement("td");
-               tr.appendChild(depth_td);
-               $(depth_td).addClass("depth");
-               $(depth_td).text("d" + line.depth);
-
-               var pv_td = document.createElement("td");
-               tr.appendChild(pv_td);
-               $(pv_td).addClass("pv");
-               $(pv_td).text(print_pv(line.pv_pretty, data.position.move_num, data.position.toplay, 10));
-
-               tbl.append(tr);
-       }
-
-       // Next update.
-       setTimeout(function() { request_update(board, 0); }, 100);
-}
-
-var init = function() {
-       // Create board.
-       var board = new ChessBoard('board', 'start');
-
-       request_update(board, 1);
-
-};
-$(document).ready(init);
-</script>
+<script type="text/javascript" src="js/remoteglot.js"></script>
 </body>
 </html>
diff --git a/www/js/remoteglot.js b/www/js/remoteglot.js
new file mode 100644 (file)
index 0000000..3aeb4db
--- /dev/null
@@ -0,0 +1,394 @@
+var arrows = [];
+var arrow_targets = [];
+var occupied_by_arrows = [];
+
+var request_update = function(board, first) {
+       $.ajax({
+               //url: "http://analysis.sesse.net/analysis.pl?first=" + first
+               url: "http://analysis.sesse.net:5000/analysis.pl?first=" + first
+       }).done(function(data) {
+               update_board(board, data);
+       });
+}
+
+var clear_arrows = function() {
+       for (var i = 0; i < arrows.length; ++i) {
+               jsPlumb.detach(arrows[i]);
+       }
+       arrows = [];
+
+       for (var i = 0; i < arrow_targets.length; ++i) {
+               document.body.removeChild(arrow_targets[i]);
+       }
+       arrow_targets = [];
+       
+       occupied_by_arrows = [];        
+       for (var y = 0; y < 8; ++y) {
+               occupied_by_arrows.push([false, false, false, false, false, false, false, false]);
+       }
+}
+
+var sign = function(x) {
+       if (x > 0) {
+               return 1;
+       } else if (x < 0) {
+               return -1;
+       } else {
+               return 0;
+       }
+}
+
+// See if drawing this arrow on the board would cause unduly amount of confusion.
+var interfering_arrow = function(from, to) {
+       var from_col = from.charCodeAt(0) - "a1".charCodeAt(0);
+       var from_row = from.charCodeAt(1) - "a1".charCodeAt(1);
+       var to_col   = to.charCodeAt(0) - "a1".charCodeAt(0);
+       var to_row   = to.charCodeAt(1) - "a1".charCodeAt(1);
+
+       occupied_by_arrows[from_row][from_col] = true;
+
+       // Knight move: Just check that we haven't been at the destination before.
+       if ((Math.abs(to_col - from_col) == 2 && Math.abs(to_row - from_row) == 1) ||
+           (Math.abs(to_col - from_col) == 1 && Math.abs(to_row - from_row) == 2)) {
+               return occupied_by_arrows[to_row][to_col];
+       }
+
+       // Sliding piece: Check if anything except the from-square is seen before.
+       var dx = sign(to_col - from_col);
+       var dy = sign(to_row - from_row);
+       var x = from_col;
+       var y = from_row;
+       do {
+               x += dx;
+               y += dy;
+               if (occupied_by_arrows[y][x]) {
+                       return true;
+               }
+               occupied_by_arrows[y][x] = true;
+       } while (x != to_col || y != to_row);
+
+       return false;
+}
+
+var add_target = function() {
+       var elem = document.createElement("div");
+       $(elem).addClass("window");
+       elem.id = "target" + arrow_targets.length;
+       document.body.appendChild(elem);        
+       arrow_targets.push(elem);
+       return elem.id;
+}
+
+var create_arrow = function(from_square, to_square, fg_color, line_width, arrow_size) {
+       var from_col = from_square.charCodeAt(0) - "a1".charCodeAt(0);
+       var from_row = from_square.charCodeAt(1) - "a1".charCodeAt(1);
+       var to_col   = to_square.charCodeAt(0) - "a1".charCodeAt(0);
+       var to_row   = to_square.charCodeAt(1) - "a1".charCodeAt(1);
+
+       var from_y = (7 - from_row)*49 + 25;
+       var to_y = (7 - to_row)*49 + 25;
+       var from_x = from_col*49 + 25;
+       var to_x = to_col*49 + 25;
+
+       var dx = to_x - from_x;
+       var dy = to_y - from_y;
+       var len = Math.sqrt(dx * dx + dy * dy);
+       dx /= len;
+       dy /= len;
+
+       // Create arrow.
+       var s1 = add_target();
+       var d1 = add_target();
+       var s1v = add_target();
+       var d1v = add_target();
+       var pos = $("#board").position();
+       $("#" + s1).css({ top: pos.top + from_y + (0.5 * arrow_size) * dy, left: pos.left + from_x + (0.5 * arrow_size) * dx });
+       $("#" + d1).css({ top: pos.top + to_y - (0.5 * arrow_size) * dy, left: pos.left + to_x - (0.5 * arrow_size) * dx });
+       $("#" + s1v).css({ top: pos.top + from_y - 0 * dy, left: pos.left + from_x - 0 * dx });
+       $("#" + d1v).css({ top: pos.top + to_y + 0 * dy, left: pos.left + to_x + 0 * dx });
+       var connection1 = jsPlumb.connect({
+               source: s1,
+               target: d1,
+               connector:["Straight"],
+               cssClass:"c1",
+               endpoint:"Blank",
+               endpointClass:"c1Endpoint",                                                                                                        
+               anchor:"Continuous",
+               paintStyle:{ 
+                       lineWidth:line_width,
+                       strokeStyle:fg_color,
+                       outlineWidth:1,
+                       outlineColor:"#666",
+                       opacity:"60%"
+               }
+       });            
+       var connection2 = jsPlumb.connect({
+               source: s1v,
+               target: d1v,
+               connector:["Straight"],
+               cssClass:"vir",
+               endpoint:"Blank",
+               endpointClass:"c1Endpoint",                                                                                                        
+               anchor:"Continuous",
+               paintStyle:{ 
+                       lineWidth:0,
+                       strokeStyle:fg_color,
+                       outlineWidth:0,
+                       outlineColor:"#666",
+               },
+               overlays : [
+                       ["Arrow", {
+                               cssClass:"l1arrow",
+                               location:1.0,
+                               width: arrow_size, length: arrow_size,
+                               paintStyle:{ 
+                                       lineWidth:line_width,
+                                       strokeStyle:"#000",
+                               },
+                       }]
+               ]
+       });
+       arrows.push(connection1);
+       arrows.push(connection2);
+}
+
+// Fake multi-PV using the refutation lines. Find all “relevant” moves,
+// sorted by quality, descending.
+var find_nonstupid_moves = function(data, margin) {
+       // First of all, if there are any moves that are more than 0.5 ahead of
+       // the primary move, the refutation lines are probably bunk, so just
+       // kill them all. 
+       var best_score = undefined;
+       var pv_score = undefined;
+       for (var move in data.refutation_lines) {
+               var score = data.refutation_lines[move].score_sort_key;
+               if (move == data.pv_uci[0]) {
+                       pv_score = score;
+               }
+               if (best_score === undefined || score > best_score) {
+                       best_score = score;
+               }
+               if (!(data.refutation_lines[move].depth >= 8)) {
+                       return [];
+               }
+       }
+
+       if (best_score - pv_score > 50) {
+               return [];
+       }
+
+       // Now find all moves that are within “margin” of the best score.
+       // The PV move will always be first.
+       var moves = [];
+       for (var move in data.refutation_lines) {
+               var score = data.refutation_lines[move].score_sort_key;
+               if (move != data.pv_uci[0] && best_score - score <= margin) {
+                       moves.push(move);
+               }
+       }
+       moves = moves.sort(function(a, b) { return data.refutation_lines[b].score_sort_key - data.refutation_lines[a].score_sort_key; });
+       moves.unshift(data.pv_uci[0]);
+
+       return moves;
+}
+
+var thousands = function(x) {
+       return String(x).split('').reverse().join('').replace(/(\d{3}\B)/g, '$1,').split('').reverse().join('');
+}
+
+var print_pv = function(pretty_pv, move_num, toplay, limit) {
+       var pv = '';
+       var i = 0;
+       if (toplay == 'B') {
+               pv = move_num + '. … ' + pretty_pv[0];
+               toplay = 'W';
+               ++i;    
+       }
+       ++move_num;
+       for ( ; i < pretty_pv.length; ++i) {
+               if (toplay == 'W') {
+                       if (i > limit) {
+                               return pv + ' (…)';
+                       }
+                       if (pv != '') {
+                               pv += ' ';
+                       }
+                       pv += move_num + '. ' + pretty_pv[i];
+                       ++move_num;
+                       toplay = 'B';
+               } else {
+                       pv += ' ' + pretty_pv[i];
+                       toplay = 'W';
+               }
+       }
+       return pv;
+}
+
+var compare_by_sort_key = function(data, a, b) {
+       var ska = data.refutation_lines[a].sort_key;
+       var skb = data.refutation_lines[b].sort_key;
+       if (ska < skb) return -1;
+       if (ska > skb) return 1;
+       return 0;
+};
+
+var update_board = function(board, data) {
+       // The headline.
+       var headline = 'Analysis';
+       if (data.position.last_move !== 'none') {
+               headline += ' after ' + data.position.move_num + '. ';
+               if (data.position.toplay == 'W') {
+                       headline += '… ';
+               }
+               headline += data.position.last_move;
+               if (data.id.name) {
+                       headline += ', ';
+               }
+       }
+
+       if (data.id.name) {
+               headline += ' by ' + data.id.name;  // + ':';
+       } else {
+               //headline += ':';
+       }
+       $("#headline").text(headline);
+
+       // The score.
+       if (data.score !== null) {
+               $("#score").text(data.score);
+       }
+
+       // The search stats.
+       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)';
+               }
+               if (data.tbhits && data.tbhits > 0) {
+                       if (data.tbhits == 1) {
+                               stats += ', one Nalimov hit';
+                       } else {
+                               stats += ', ' + data.tbhits + ' Nalimov hits';
+                       }
+               }
+               
+
+               $("#searchstats").text(stats);
+       }
+
+       // Update the board itself.
+       board.position(data.position.fen);
+
+       $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
+       if (data.position.last_move_uci) {
+               var from = data.position.last_move_uci.substr(0, 2);
+               var to = data.position.last_move_uci.substr(2, 4);
+               $("#board").find('.square-' + from).addClass('nonuglyhighlight');
+               $("#board").find('.square-' + to).addClass('nonuglyhighlight');
+       }
+
+       // Print the PV.
+       var pv = print_pv(data.pv_pretty, data.position.move_num, data.position.toplay);
+       $("#pv").text(pv);
+
+       // Update the PV arrow.
+       clear_arrows();
+       if (data.pv_uci.length >= 1) {
+               // draw a continuation arrow as long as it's the same piece
+               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)) ||
+                            interfering_arrow(from, to)) {
+                               break;
+                       }
+                       create_arrow(from, to, '#f66', 6, 20);
+               }
+
+               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);
+               }
+       }
+
+       // See if all semi-reasonable moves have only one possible response.
+       if (data.pv_uci.length >= 2) {
+               var nonstupid_moves = find_nonstupid_moves(data, 300);
+               var response = data.pv_uci[1];
+               for (var i = 0; i < nonstupid_moves.length; ++i) {
+                       if (nonstupid_moves[i] == data.pv_uci[0]) {
+                               // ignore the PV move for refutation lines.
+                               continue;
+                       }
+                       if (!data.refutation_lines ||
+                           !data.refutation_lines[nonstupid_moves[i]] ||
+                           !data.refutation_lines[nonstupid_moves[i]].pv_uci ||
+                           data.refutation_lines[nonstupid_moves[i]].pv_uci.length < 1) {
+                               // Incomplete PV, abort.
+                               response = undefined;
+                               break;
+                       }
+                       var this_response = data.refutation_lines[nonstupid_moves[i]].pv_uci[1];
+                       if (response !== this_response) {
+                               // Different response depending on lines, abort.
+                               response = undefined;
+                               break;
+                       }
+               }
+
+               if (nonstupid_moves.length > 0 && response !== undefined) {
+                       create_arrow(response.substr(0, 2),
+                                    response.substr(2, 4), '#66f', 6, 20);
+               }
+       }
+
+       // Show the refutation lines.
+       var tbl = $("#refutationlines");
+       tbl.empty();
+
+       moves = [];
+       for (var move in data.refutation_lines) {
+               moves.push(move);
+       }
+       moves = moves.sort(function(a, b) { return compare_by_sort_key(data, a, b) });
+       for (var i = 0; i < moves.length; ++i) {
+               var line = data.refutation_lines[moves[i]];
+
+               var tr = document.createElement("tr");
+
+               var move_td = document.createElement("td");
+               tr.appendChild(move_td);
+               $(move_td).addClass("move");
+               $(move_td).text(line.pretty_move);
+
+               var score_td = document.createElement("td");
+               tr.appendChild(score_td);
+               $(score_td).addClass("score");
+               $(score_td).text(line.pretty_score);
+
+               var depth_td = document.createElement("td");
+               tr.appendChild(depth_td);
+               $(depth_td).addClass("depth");
+               $(depth_td).text("d" + line.depth);
+
+               var pv_td = document.createElement("td");
+               tr.appendChild(pv_td);
+               $(pv_td).addClass("pv");
+               $(pv_td).text(print_pv(line.pv_pretty, data.position.move_num, data.position.toplay, 10));
+
+               tbl.append(tr);
+       }
+
+       // Next update.
+       setTimeout(function() { request_update(board, 0); }, 100);
+}
+
+var init = function() {
+       // Create board.
+       var board = new ChessBoard('board', 'start');
+
+       request_update(board, 1);
+
+};
+$(document).ready(init);