(function() {
var board = null;
-var history = [];
+var game = new Chess();
+var fens = []; // Position after each.
var move_override = 0;
var includetransp = true;
+var stockfish = new Worker('/js/stockfish.js');
+var engine_running = false;
+var engine_replacement_callback = null;
+var recommended_move = null;
+var reverse_dragging_from = null;
+var practice_mode = false;
+var practice_side = 'W';
+
+// TODO: Make this configurable.
+var practice_top_moves_limit = 5;
+var practice_minimum_move_fraction_start = 0.05;
+var practice_minimum_move_fraction_move5 = 0.30;
var entity_map = {
"&": "&",
});
}
-var get_game = function(skip_last_move) {
- var moves_to_drop = 0;
- if (skip_last_move === true) {
- moves_to_drop = 1;
- }
+var current_display_fen = function() {
+ return fen_before_move(move_override);
+}
- var game = new Chess();
- for (var i = 0; i < move_override - moves_to_drop; ++i) {
- game.move(history[i]);
+var fen_before_move = function(move_num) {
+ if (move_num == 0) {
+ return 'rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1';
+ } else {
+ return fens[move_num - 1];
}
- return game;
}
var update = function() {
var text = "";
+ var history = game.history({ verbose: true });
for (var i = 0; i < history.length; ++i) {
if (i % 2 == 0) {
text += (i/2 + 1) + ". ";
}
if (i + 1 == move_override) {
- text += '<strong>' + history[i] + '</strong>';
+ text += '<strong>' + history[i].san + '</strong>';
} else {
- text += '<a href="javascript:set_move(' + (i + 1) + ')">' + history[i] + '</a>';
+ text += '<a href="javascript:set_move(' + (i + 1) + ')">' + history[i].san + '</a>';
}
text += " ";
}
$('#gamehistory').html(text);
- var game = get_game();
- board.position(game.fen());
+ if (board.fen() != current_display_fen()) {
+ board.position(current_display_fen());
+ }
- var all_moves = game.history({ verbose: true });
- if (all_moves.length > 0) {
- var last_move = all_moves.pop();
+ $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
+ if (move_override > 0) {
+ var last_move = history[move_override - 1];
var highlight_from = last_move.from;
var highlight_to = last_move.to;
- $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
$("#board").find('.square-' + highlight_from).addClass('nonuglyhighlight');
$("#board").find('.square-' + highlight_to).addClass('nonuglyhighlight');
}
+ if (practice_mode) {
+ find_last_move_score();
+ var side_to_move = (move_override % 2 == 0) ? 'W' : 'B';
+ if (side_to_move !== practice_side) {
+ find_computer_move();
+ }
+ // Fall through to get the line name and such.
+ }
+
fetch_analysis();
}
+var get_history_url = function() {
+ var history = game.history({ verbose: true }).map(function(x) { return x.san; });
+ history.length = move_override;
+ return '/?' + history.join(',');
+}
+
var fetch_analysis = function() {
- var game = get_game();
- var fen = game.fen();
+ var fen = current_display_fen();
$.ajax({
url: "/opening-stats.pl?fen=" + encodeURIComponent(fen) +
";includetransp=" + (includetransp ? 1 : 0)
});
}
+var find_last_move_score = function() {
+ var history = game.history({ verbose: true });
+ var side_to_move = (move_override % 2 == 0) ? 'W' : 'B';
+ var move_num = (side_to_move === practice_side) ? (move_override - 2) : (move_override - 1);
+ if (move_num < 0) {
+ $("#yourmove").text("(none)");
+ $("#yourfraction").text("N/A");
+ $("#yourrank").text("N/A");
+ $("#yourawin").text("??.?%");
+ $("#yourawindiff").text("+?.?%");
+ return;
+ }
+
+ var chosen_move = history[move_num].san;
+ $("#yourmove").text(chosen_move);
+ $.ajax({
+ url: "/opening-stats.pl?fen=" + encodeURIComponent(fen_before_move(move_num)) +
+ ";includetransp=0"
+ }).done(function(data, textstatus, xhr) {
+ var moves = data['moves'];
+ var root_move = sort_moves_by_common(moves, data);
+ var your_move, your_index;
+
+ for (var i = 0; i < moves.length; ++i) {
+ var move = moves[i];
+ if (move['move'] === chosen_move) {
+ your_move = move;
+ your_index = i;
+ }
+ }
+ moves.sort(function(a, b) { return b['num'] - a['num'] });
+
+ if (your_move) {
+ $("#yourfraction").text(format_fraction(your_move['fraction']));
+ $("#yourawin").text(format_fraction(your_move['corrected_win_ratio']));
+ $("#yourrank").text(format_ordinal(your_index + 1) + ", based on " + root_move['num'] + " games");
+ var diff = your_move['corrected_win_ratio'] - root_move['corrected_win_ratio'];
+ $("#yourawindiff").css("color", "black");
+ if (diff === 0) {
+ $("#yourawindiff").text("0.0%");
+ } else if (diff > 0) {
+ $("#yourawindiff").text("+" + format_fraction(diff));
+ $("#yourawindiff").css("color", "green");
+ } else {
+ $("#yourawindiff").text(format_fraction(diff));
+ if (diff < -0.02) {
+ $("#yourawindiff").css("color", "red");
+ }
+ }
+ } else {
+ $("#yourfraction").text("??.?%");
+ $("#yourrank").text("?th");
+ $("#yourawin").text("??.?%");
+ $("#yourawindiff").text("+?.?%");
+ }
+ });
+}
+
+var find_computer_move = function() {
+ var fen = current_display_fen();
+ $.ajax({
+ url: "/opening-stats.pl?fen=" + encodeURIComponent(fen) + ";includetransp=0"
+ }).done(function(data, textstatus, xhr) {
+ var candidate_moves = [];
+
+ var moves = data['moves'];
+ var root_move = sort_moves_by_common(moves, data);
+
+ var practice_minimum_move_fraction;
+ if (move_override > 20) {
+ practice_minimum_move_fraction = practice_minimum_move_fraction_move5;
+ } else {
+ practice_minimum_move_fraction = practice_minimum_move_fraction_start +
+ ((move_override-1)/10.0) * (practice_minimum_move_fraction_move5 - practice_minimum_move_fraction_start);
+ }
+ console.log(practice_minimum_move_fraction);
+
+ for (var i = 0; i < Math.min(moves.length, practice_top_moves_limit); ++i) {
+ var move = moves[i];
+ if (i == 0 || move['fraction'] >= practice_minimum_move_fraction) {
+ candidate_moves.push(move);
+ }
+ }
+
+ // Pick one at random.
+ var chosen_index = Math.floor(Math.random() * candidate_moves.length);
+ var chosen = candidate_moves[chosen_index];
+ $("#compmove").text(chosen['move']);
+ $("#compfraction").text((100.0 * chosen['fraction']).toFixed(1) + "%");
+ if (candidate_moves.length == 1) {
+ $("#comprank").text("only candidate move");
+ } else {
+ $("#comprank").text(format_ordinal(chosen_index + 1) + " out of " + candidate_moves.length + " candidate moves");
+ }
+ make_move(chosen['move']);
+ });
+}
+
+// Add deried data and then sort moves to get the most common ones (in-place).
+// Remove the root mode and return it. Currently usable for practice mode only!
+var sort_moves_by_common = function(moves, data)
+{
+ var total_num = find_total_games(moves);
+ var root_move;
+ for (var i = 0; i < moves.length; ++i) {
+ var move = moves[i];
+ calc_move_derived_data(move, total_num, data, (practice_side === 'W'));
+ if (!move['move']) {
+ root_move = (moves.splice(i, 1))[0];
+ --i;
+ }
+ }
+ moves.sort(function(a, b) { return b['num'] - a['num'] });
+ return root_move;
+}
+
var add_td = function(tr, value) {
var td = document.createElement("td");
tr.appendChild(td);
$(td).text(value);
}
+var format_ordinal = function(x) {
+ var tens = Math.floor(x / 10) % 10;
+ if (tens == 1) {
+ return x + "th";
+ } else {
+ var ones = x % 10;
+ if (ones == 1) return x + "st";
+ if (ones == 2) return x + "nd";
+ if (ones == 3) return x + "rd";
+ return x + "th";
+ }
+}
+
+var format_fraction = function(x) {
+ return (100.0 * x).toFixed(1) + '%';
+}
+
var TYPE_MOVE = 0;
var TYPE_INTEGER = 1;
var TYPE_FLOAT = 2;
[ "Move", TYPE_MOVE ],
[ "Games", TYPE_INTEGER ],
[ "%", TYPE_RATIO ],
+ [ "CGames", TYPE_INTEGER ],
+ [ "Hum", TYPE_RATIO ],
[ "Win%", TYPE_RATIO ],
[ "WWin", TYPE_INTEGER ],
[ "%WW", TYPE_RATIO ],
$('#gamesummary').html(text);
}
- var total_num = 0;
- for (var i = 0; i < moves.length; ++i) {
- var move = moves[i];
- if (move['move']) {
- total_num += parseInt(move['white']);
- total_num += parseInt(move['draw']);
- total_num += parseInt(move['black']);
- }
- }
+ var total_num = find_total_games(moves);
var headings_tr = $("#headings");
headings_tr.empty();
var move = moves[i];
var line = [];
- var white = parseInt(move['white']);
- var draw = parseInt(move['draw']);
- var black = parseInt(move['black']);
+ calc_move_derived_data(move, total_num, data, (move_override % 2 == 0));
+
+ var white = move['white'];
+ var draw = move['draw'];
+ var black = move['black'];
+ var computer = move['computer'];
line.push(move['move']); // Move.
transpose_only.push(move['transpose_only']);
- var num = white + draw + black;
- line.push(num); // N.
- line.push(num / total_num); // %.
-
- // Win%.
- var white_win_ratio = (white + 0.5 * draw) / num;
- var win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
- line.push(win_ratio);
-
- line.push(white); // WWin.
- line.push(white / num); // %WW.
- line.push(black); // BWin.
- line.push(black / num); // %BW.
- line.push(draw); // Draw.
- line.push(draw / num); // %Draw.
+ line.push(move['num']); // N.
+ line.push(move['fraction']); // %.
+ line.push(computer); // CGames.
+ line.push(move['human_index']); // Hum.
+ line.push(move['win_ratio']); // Win%.
+
+ line.push(white); // WWin.
+ line.push(white / move['num']); // %WW.
+ line.push(black); // BWin.
+ line.push(black / move['num']); // %BW.
+ line.push(draw); // Draw.
+ line.push(draw / move['num']); // %Draw.
if (move['num_elo'] >= 10) {
// Elo.
line.push(move['white_avg_elo']);
line.push(move['black_avg_elo']);
line.push(move['white_avg_elo'] - move['black_avg_elo']);
-
- // Win% corrected for Elo.
- var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
- win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
- white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
- win_ratio = (game.turn() == 'w') ? white_win_ratio : 1.0 - white_win_ratio;
- line.push(win_ratio);
} else {
line.push(null);
line.push(null);
line.push(null);
- line.push(null);
}
+
+ line.push(move['corrected_win_ratio'] || null);
lines.push(line);
}
}
}
- var move_a = document.createElement("a");
- move_a.href = "javascript:make_move('" + line[j] + "')";
- td.appendChild(move_a);
- $(move_a).text(line[j]);
+ if (line[j] === '1-0' || line[j] === '1/2-1/2' || line[j] === '0-1') {
+ $(td).text($(td).text() + line[j]);
+ } else {
+ var move_a = document.createElement("a");
+ move_a.href = "javascript:make_move('" + line[j] + "')";
+ td.appendChild(move_a);
+ $(move_a).text(line[j]);
+ }
} else if (headings[j][1] == TYPE_INTEGER) {
- add_td(tr, line[j]);
+ add_td(tr, line[j] || 0);
} else if (headings[j][1] == TYPE_FLOAT) {
- add_td(tr, line[j].toFixed(1));
+ if (isNaN(line[j]) || !isFinite(line[j])) {
+ add_td(tr, '');
+ } else {
+ add_td(tr, line[j].toFixed(1));
+ }
} else {
- add_td(tr, (100.0 * line[j]).toFixed(1) + "%");
+ if (isNaN(line[j]) || !isFinite(line[j])) {
+ add_td(tr, '');
+ } else {
+ add_td(tr, format_fraction(line[j]));
+ }
}
}
}
}
+var find_total_games = function(moves) {
+ var total_num = 0;
+ for (var i = 0; i < moves.length; ++i) {
+ var move = moves[i];
+ if (move['move']) {
+ total_num += move['white'];
+ total_num += move['draw'];
+ total_num += move['black'];
+ }
+ }
+ return total_num;
+}
+
+var calc_move_derived_data = function(move, total_num, data, is_white) {
+ var white = move['white'];
+ var draw = move['draw'];
+ var black = move['black'];
+ var computer = move['computer'];
+
+ var num = white + draw + black;
+ move['num'] = num;
+ move['fraction'] = num / total_num;
+
+ // Adjust so that the human index is 50% overall.
+ var exp = Math.log(0.5) / Math.log(data['computer_games'] / data['total_games']);
+ move['human_index'] = 1.0 - Math.pow(computer / num, exp);
+
+ // Win%.
+ var white_win_ratio = (white + 0.5 * draw) / num;
+ var win_ratio = is_white ? white_win_ratio : 1.0 - white_win_ratio;
+ move['win_ratio'] = win_ratio;
+
+ if (move['num_elo'] >= 10) {
+ // Win% corrected for Elo.
+ var win_elo = -400.0 * Math.log(1.0 / white_win_ratio - 1.0) / Math.LN10;
+ win_elo -= (move['white_avg_elo'] - move['black_avg_elo']);
+ white_win_ratio = 1.0 / (1.0 + Math.pow(10, win_elo / -400.0));
+ win_ratio = is_white ? white_win_ratio : 1.0 - white_win_ratio;
+ move['corrected_win_ratio'] = win_ratio;
+ }
+};
+
var set_includetransp = function(value) {
includetransp = value;
update();
}
window['set_includetransp'] = set_includetransp;
-var make_move = function(move) {
- if (move_override < history.length && history[move_override] == move) {
+var set_flipboard = function(value) {
+ board.orientation(value ? 'black' : 'white');
+}
+window['set_flipboard'] = set_flipboard;
+
+var set_practice = function(value) {
+ practice_mode = value;
+ if (practice_mode) {
+ practice_side = (move_override % 2 == 0) ? 'W' : 'B';
+ find_last_move_score();
+ $("#stats").hide();
+ $("#practiceoutput").show();
+ document.getElementById("includetransp").checked = false;
+ } else {
+ $("#stats").show();
+ $("#practiceoutput").hide();
+ }
+ update();
+}
+window['set_practice'] = set_practice;
+
+var make_move = function(move, do_update) {
+ var history = game.history({ verbose: true });
+ if (move_override < history.length && history[move_override].san == move) {
// User effectively only moved forward in history.
++move_override;
} else {
- history.length = move_override;
- history.push(move);
- move_override = history.length;
+ var moves = game.history();
+ // Truncate the history if needed.
+ if (move_override < moves.length) {
+ game = new Chess();
+ for (var i = 0; i < move_override; ++i) {
+ game.move(moves[i]);
+ }
+ fens.length = move_override;
+ }
+ game.move(move);
+ fens.push(game.fen());
+ ++move_override;
+ }
+
+ if (do_update !== false) {
+ update();
+ window.history.pushState(null, null, get_history_url());
}
- update();
}
window['make_move'] = make_move;
var prev_move = function() {
- if (move_override > 0) {
- --move_override;
+ var moves_to_skip = practice_mode ? 2 : 1;
+ if (move_override >= moves_to_skip) {
+ move_override -= moves_to_skip;
update();
+ window.history.replaceState(null, null, get_history_url());
}
}
window['prev_move'] = prev_move;
var next_move = function() {
- if (move_override < history.length) {
+ if (move_override < game.history().length) {
++move_override;
update();
+ window.history.replaceState(null, null, get_history_url());
}
}
window['next_move'] = next_move;
-var set_move = function(n) {
+var set_move = function(n, do_update) {
move_override = n;
- update();
+ if (do_update !== false) {
+ update();
+ window.history.replaceState(null, null, get_history_url());
+ }
}
window['set_move'] = set_move;
// almost all of this stuff comes from the chessboard.js example page
var onDragStart = function(source, piece, position, orientation) {
- var game = get_game();
- if (game.game_over() === true ||
- (game.turn() === 'w' && piece.search(/^b/) !== -1) ||
- (game.turn() === 'b' && piece.search(/^w/) !== -1)) {
+ var pseudogame = new Chess(current_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 = null;
+ get_best_dest(pseudogame, source, null, function(src, dest) {
+ $("#board").find('.square-55d63').removeClass('nonuglyhighlight');
+ if (dest !== null) {
+ var squareEl = $('#board .square-' + dest);
+ squareEl.addClass('highlight1-32417');
+ recommended_move = [src, dest];
+ }
+ });
+}
+
+var mousedownSquare = function(e) {
+ reverse_dragging_from = null;
+ var square = $(this).attr('data-square');
+
+ var pseudogame = new Chess(current_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;
+ get_best_dest(pseudogame, null, square, function(src, dest) {
+ if (src !== null) {
+ var squareEl = $('#board .square-' + src);
+ squareEl.addClass('highlight1-32417');
+ squareEl = $('#board .square-' + dest);
+ squareEl.addClass('highlight1-32417');
+ recommended_move = [src, dest];
+ }
+ });
+ } else {
+ recommended_src = null;
+ }
+}
+
+var mouseupSquare = function(e) {
+ if (reverse_dragging_from === null) {
+ return;
+ }
+ var source = $(this).attr('data-square');
+ var target = reverse_dragging_from;
+ reverse_dragging_from = null;
+ if (onDrop(source, target) !== 'snapback') {
+ onSnapEnd(source, target);
+ }
+ $("#board").find('.square-55d63').removeClass('highlight1-32417');
+}
+
+var get_best_dest = function(game, source, target, cb) {
+ 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) {
+ cb(null, null);
+ return;
+ }
+ if (moves.length == 1) {
+ cb(moves[0].from, moves[0].to);
+ return;
+ }
+
+ // More than one move. Ask the engine to disambiguate.
+ var uci_moves = moves.map(function(m) { return m.from + m.to; });
+ var when_engine_is_ready = function() {
+ engine_running = true;
+ stockfish.onmessage = function(event) {
+ var res = event.data.match(/^bestmove (\S\S)(\S\S)/);
+ if (res !== null) {
+ engine_running = false;
+ if (engine_replacement_callback !== null) {
+ // We are no longer interested in this query,
+ // so just discard it and call this other callback.
+ engine_replacement_callback();
+ engine_replacement_callback = null;
+ } else {
+ cb(res[1], res[2]);
+ }
+ }
+ };
+ stockfish.postMessage("position fen " + game.fen());
+ stockfish.postMessage("go depth 6 searchmoves " + uci_moves.join(" "));
+ };
+ if (engine_running) {
+ engine_replacement_callback = when_engine_is_ready;
+ } else {
+ when_engine_is_ready();
+ }
}
var onDrop = function(source, target) {
+ if (engine_running) {
+ // Snap end before the engine came back.
+ // Discard the result when it does.
+ engine_replacement_callback = function() {};
+ }
+ 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 game = get_game();
- var move = game.move({
+ var pseudogame = new Chess(current_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 new_history = game.history({ verbose: true });
- history = [];
- for (var i = 0; i < new_history.length; ++i) {
- history.push(new_history[i].san);
+var onSnapEnd = function(source, target) {
+ if (source == target && recommended_move !== null) {
+ source = recommended_move[0];
+ target = recommended_move[1];
+ }
+ recommended_move = null;
+ var pseudogame = new Chess(current_display_fen());
+ var move = pseudogame.move({
+ from: source,
+ to: target,
+ promotion: 'q' // NOTE: always promote to a queen for example simplicity
+ });
+
+ make_move(pseudogame.history({ verbose: true }).pop().san);
+}
+
+var onpopstate = function() {
+ var old_moves = game.history({ verbose: true }).map(function(x) { return x.san; });
+ var new_moves = document.location.search.replace(/^\?/, "").split(",");
+
+ if (new_moves.length == 1 && new_moves[0] == "") {
+ new_moves = [];
+ }
+
+ var num_shared_moves;
+ for (num_shared_moves = 0; num_shared_moves < Math.min(old_moves.length, new_moves.length); ++num_shared_moves) {
+ if (old_moves[i] != new_moves[i]) {
+ break;
+ }
}
- move_override = history.length;
-};
-// update the board position after the piece snap
-// for castling, en passant, pawn promotion
-var onSnapEnd = function() {
- var game = get_game();
- board.position(game.fen());
+ set_move(num_shared_moves, false);
+ for (var i = num_shared_moves; i < new_moves.length; ++i) {
+ make_move(new_moves[i], false);
+ }
update();
-};
+ window.history.replaceState(null, null, get_history_url());
+}
var init = function() {
// Create board.
onDrop: onDrop,
onSnapEnd: onSnapEnd
});
- update();
+ $("#board").on('mousedown', '.square-55d63', mousedownSquare);
+ $("#board").on('mouseup', '.square-55d63', mouseupSquare);
+
+ window.onpopstate = onpopstate;
+ onpopstate();
+ set_practice(false);
$(window).keyup(function(event) {
if (event.which == 39) {
prev_move();
}
});
-}
+ // Seemingly the web worker is not started before we send it a message.
+ stockfish.postMessage("uci");
+}
$(document).ready(init);
projects / remoteglot-book / blobdiff