diff --git a/js/chess.js b/js/chess.js
index 187ce10..be6a664 100644
--- a/js/chess.js
+++ b/js/chess.js
@@ -57,10 +57,10 @@ function otherSide(side){
 function boardGet(board, where, side){
    side = normalizeSide(side);
    if (where === 'phantom') {
-      if (!board['phantom'] || board['phantom']['type'][1] !== side[0]) {
+      if (!board.phantom || board.phantom.type[1] !== side[0]) {
          return ' ';
       } else {
-         return board['phantom']['type'][0];
+         return board.phantom.type[0];
       }
    } else {
       var column = 'abcdefgh'.indexOf(where[0]);
@@ -81,11 +81,11 @@ function boardPut(board, where, side, piece){
 
 function countMoves(board) {
    var n = 0;
-   while (board && board['prior']) {
-      if (board['prior']['player'] !== board['player']) {
+   while (board && board.prior) {
+      if (board.prior.player !== board.player) {
          ++n;
       }
-      board = board['prior'];
+      board = board.prior;
    }
    return n;
 }
@@ -133,18 +133,18 @@ function hasMoved(board, side, where){
          return false;
       }
 
-      const move = board['move'];
+      const move = board.move;
 
-      if (move && move['side'] === side && move['to'] === where) {
+      if (move && move.side === side && move.to === where) {
          return true;
       }
 
-      board = board['prior'];
+      board = board.prior;
    }
 }
 
 function legalMoves(board, side, type, from, canCapture){
-   if (board['move'] && board['move']['took'] === 'k') {
+   if (board.move && board.move.took === 'k') {
       return [];
    }
 
@@ -153,7 +153,7 @@ function legalMoves(board, side, type, from, canCapture){
    var legals = [];
 
    if (from === 'phantom') {
-      from = board['phantom']['from'];
+      from = board.phantom.from;
    }
 
    if (type === 'k') {
@@ -224,16 +224,16 @@ function legalMoves(board, side, type, from, canCapture){
                   legals.push(there);
                } else {
                   var otherBoard = board;
-                  while (otherBoard && otherBoard['move'] && otherBoard['move']['side'][0] === side[0]) {
-                     otherBoard = otherBoard['prior'];
+                  while (otherBoard && otherBoard.move && otherBoard.move.side[0] === side[0]) {
+                     otherBoard = otherBoard.prior;
                   }
-                  if (otherBoard && otherBoard['move']) {
-                     const move = otherBoard['move'];
-                     if (move['side'][0] !== side[0] && move['type'] === 'p') {
+                  if (otherBoard && otherBoard.move) {
+                     const move = otherBoard.move;
+                     if (move.side[0] !== side[0] && move.type === 'p') {
                         const from =
-                           (move['from'] === 'phantom') ?
-                              otherBoard['prior']['phantom']['from'] :
-                              move['from'];
+                           (move.from === 'phantom') ?
+                              otherBoard.prior.phantom.from :
+                              move.from;
                         if (from[0] === there[0] && from[1] === forward2[1]) {
                            /* en passant */
                            legals.push(there);
@@ -255,7 +255,7 @@ function movePiece(priorBoard, side, from, to){
    var took = boardGet(priorBoard, to, other);
    var replaced = boardGet(priorBoard, to, side);
    var alongside = boardGet(priorBoard, from, other);
-   var actuallyFrom = (from === 'phantom') ? priorBoard['phantom']['from'] : from;
+   var actuallyFrom = (from === 'phantom') ? priorBoard.phantom.from : from;
 
    const legals = legalMoves(priorBoard, side, type, from, alongside === ' ');
    if (!legals.includes(to)) {
@@ -263,69 +263,69 @@ function movePiece(priorBoard, side, from, to){
    }
 
    var undoBoard = priorBoard;
-   if (undoBoard['subsequent']) {
+   if (undoBoard.subsequent) {
       undoBoard = cloneJSON(undoBoard);
-      delete undoBoard['subsequent'];
+      delete undoBoard.subsequent;
    }
 
    var board = cloneJSON(undoBoard);
-   board['prior'] = undoBoard;
+   board.prior = undoBoard;
 
-   board['timestamp'] = new Date().getTime();
+   board.timestamp = new Date().getTime();
 
-   board['move'] = {
+   board.move = {
       'side': normalizeSide(side),
       'type': type,
       'from': from,
       'to': to
    };
    if (took !== ' ') {
-      board['move']['took'] = took;
+      board.move.took = took;
    }
    if (replaced !== ' ') {
-      board['move']['replaced'] = replaced;
+      board.move.replaced = replaced;
    }
    if (alongside !== ' ') {
-      board['move']['alongside'] = alongside;
+      board.move.alongside = alongside;
    }
    if (type === 'k' && actuallyFrom[0] === 'e' && to[0] === 'g') {
-      board['move']['castle'] = true;
+      board.move.castle = true;
       boardPut(board, 'h' + actuallyFrom[1], side, ' ');
       boardPut(board, 'f' + actuallyFrom[1], side, 'r');
    }
    if (type === 'k' && actuallyFrom[0] === 'e' && to[0] === 'c') {
-      board['move']['queen_castle'] = true;
+      board.move.queen_castle = true;
       boardPut(board, 'a' + actuallyFrom[1], side, ' ');
       boardPut(board, 'd' + actuallyFrom[1], side, 'r');
    }
    if (type === 'p' && (isDark(side) ? (to[1] === '1') : (to[1] === '8'))) {
-      board['move']['promotion'] = 'q';  /* TODO: allow other choices */
+      board.move.promotion = 'q';  /* TODO: allow other choices */
       type = 'q';
    }
    if (alongside === 'p' && (isDark(other) ? (to[1] === '1') : (to[1] === '8'))) {
-      board['move']['promotion'] = 'q';  /* TODO: allow other choices */
+      board.move.promotion = 'q';  /* TODO: allow other choices */
       alongside = 'q';
    }
    if (type === 'p' && alongside === ' ' && to[0] !== actuallyFrom[0]) {
       var otherBoard = priorBoard;
-      while (otherBoard && otherBoard['move'] && otherBoard['move']['side'][0] === side[0]) {
-         otherBoard = otherBoard['prior'];
+      while (otherBoard && otherBoard.move && otherBoard.move.side[0] === side[0]) {
+         otherBoard = otherBoard.prior;
       }
-      if (otherBoard && otherBoard['move']) {
-         const move = otherBoard['move'];
-         if (move['type'] === 'p' && move['to'][0] === to[0] && move['to'][1] === actuallyFrom[1]) {
-            const moveFrom = (move['from'] === 'phantom') ? otherBoard['prior']['phantom']['from'] : move['from'];
-            if (move['side'][0] === other[0] && moveFrom[1] != to[1]) {
-               board['move']['en_passant'] = true;
+      if (otherBoard && otherBoard.move) {
+         const move = otherBoard.move;
+         if (move.type === 'p' && move.to[0] === to[0] && move.to[1] === actuallyFrom[1]) {
+            const moveFrom = (move.from === 'phantom') ? otherBoard.prior.phantom.from : move.from;
+            if (move.side[0] === other[0] && moveFrom[1] != to[1]) {
+               board.move.en_passant = true;
                alongside = 'p';
-               boardPut(board, move['to'], other, ' ');
+               boardPut(board, move.to, other, ' ');
             }
          }
       }
    }
 
    if (from === 'phantom') {
-      delete board['phantom'];
+      delete board.phantom;
    } else {
       boardPut(board, from, side, ' ');
       boardPut(board, from, other, ' ');
@@ -338,9 +338,9 @@ function movePiece(priorBoard, side, from, to){
    }
 
    if (replaced === ' ') {
-      board['player'] = otherSide(board['player']);
+      board.player = otherSide(board.player);
    } else {
-      board['phantom'] = { 'from': to, 'type': replaced + side[0] };
+      board.phantom = { 'from': to, 'type': replaced + side[0] };
    }
 
    return board;
@@ -349,9 +349,9 @@ function movePiece(priorBoard, side, from, to){
 function renderHistory(board) {
    var list = [];
 
-   while (board && board['move']) {
-      list.push(board['move']);
-      board = board['prior'];
+   while (board && board.move) {
+      list.push(board.move);
+      board = board.prior;
    }
 
    const NBSP = '\u00a0';  /* non-breaking space */
@@ -363,48 +363,48 @@ function renderHistory(board) {
 
    while (list.length > 0) {
       const move = list.pop();
-      if (move['from'] === 'phantom') {
-         const piece = move['type'] === 'p' ? '' : move['type'].toUpperCase();
-         const took = move['took'] ? 'x' : '';
-         result += SHY + '*' + piece + took + move['to'];
+      if (move.from === 'phantom') {
+         const piece = move.type === 'p' ? '' : move.type.toUpperCase();
+         const took = move.took ? 'x' : '';
+         result += SHY + '*' + piece + took + move.to;
       } else {
-         if (n > 0 || move['side'] === 'dark') {
+         if (n > 0 || move.side === 'dark') {
             result += ' ';
          }
 
-         if (move['side'] === 'light') {
+         if (move.side === 'light') {
             ++n;
             result += String(n) + '.' + NBSP;
          }
 
-         if (move['pass']) {
+         if (move.pass) {
             result += '...';
-         } else if (move['alongside']) {
-            if (move['side'] === 'light') {
-               result += move['type'].toUpperCase() + move['alongside'].toUpperCase() + move['from'] + move['to'];
+         } else if (move.alongside) {
+            if (move.side === 'light') {
+               result += move.type.toUpperCase() + move.alongside.toUpperCase() + move.from + move.to;
             } else {
-               result += move['alongside'].toUpperCase() + move['type'].toUpperCase() + move['from'] + move['to'];
+               result += move.alongside.toUpperCase() + move.type.toUpperCase() + move.from + move.to;
             }
-         } else if (move['castle']) {
+         } else if (move.castle) {
             result += 'O-O';
-         } else if (move['queen_castle']) {
+         } else if (move.queen_castle) {
             result += 'O-O-O';
          } else {
-            const piece = move['type'] === 'p' ? '' : move['type'].toUpperCase();
-            const took = move['took'] ? 'x' : '';
-            result += piece + move['from'] + took + move['to'];
+            const piece = move.type === 'p' ? '' : move.type.toUpperCase();
+            const took = move.took ? 'x' : '';
+            result += piece + move.from + took + move.to;
          }
       }
 
-      if (move['en_passant']) {
+      if (move.en_passant) {
          result += 'e.p.';
       }
 
-      if (move['promotion']) {
-         result += '(' + move['promotion'][0].toUpperCase() + ')';
+      if (move.promotion) {
+         result += '(' + move.promotion[0].toUpperCase() + ')';
       }
 
-      if (move['took'] === 'k') {
+      if (move.took === 'k') {
          result += '#';
       }
    }
@@ -417,7 +417,7 @@ function pieceStartDrag(ev, ui){
    const dragged = $(this);
    const type = dragged.data('type');
    const from = dragged.data('location');
-   const where = (from === 'phantom') ? board['phantom']['from'] : from;
+   const where = (from === 'phantom') ? board.phantom.from : from;
    const canCapture = boardGet(board, from, otherSide(type[1])) === ' ';
    const legals = legalMoves(board, type[1], type[0], where, canCapture);
    for (const there of legals) {
@@ -471,35 +471,35 @@ function renderBoard(board){
       }
    }
 
-   var clss = board['player'] === 'light' ? '.cb-lt-piece' : '.cb-dk-piece';
+   var clss = board.player === 'light' ? '.cb-lt-piece' : '.cb-dk-piece';
 
-   if (board['phantom']) {
-      var where = board['phantom']['from'];
-      placePiece('phantom', board['phantom']['type'], 'ph');
+   if (board.phantom) {
+      var where = board.phantom.from;
+      placePiece('phantom', board.phantom.type, 'ph');
       $('#cb_phantom').appendTo('#cb_' + where);
       $('#cb_board .ui-draggable').draggable('disable');
       $('#cb_phantom .ui-draggable-disabled').filter(clss).draggable('enable');
    } else {
       $('#cb_board .ui-draggable').draggable('disable');
-      if (!board['move'] || board['move']['took'] !== 'k') {
+      if (!board.move || board.move.took !== 'k') {
          $('#cb_board .ui-draggable-disabled').filter(clss).draggable('enable');
       }
    }
 
-   if (board['move']) {
-      if (board['move']['from'] === 'phantom') {
-         $('#cb_' + board['prior']['move']['to']).addClass('cb-start');
+   if (board.move) {
+      if (board.move.from === 'phantom') {
+         $('#cb_' + board.prior.move.to).addClass('cb-start');
       } else {
-         $('#cb_' + board['move']['from']).addClass('cb-start');
+         $('#cb_' + board.move.from).addClass('cb-start');
       }
-      $('#cb_' + board['move']['to']).addClass('cb-end');
+      $('#cb_' + board.move.to).addClass('cb-end');
    }
 
    var msg = '';
-   if (board['move'] && board['move']['took'] === 'k') {
-      msg = (board['move']['side'][0] === 'd' ? 'Dark' : 'Light') + ' player won!';
+   if (board.move && board.move.took === 'k') {
+      msg = (board.move.side[0] === 'd' ? 'Dark' : 'Light') + ' player won!';
    } else {
-      msg = (board['player'][0] === 'd' ? 'Dark' : 'Light') + " player's move";
+      msg = (board.player[0] === 'd' ? 'Dark' : 'Light') + " player's move";
    }
    $('#cb_message').text(msg);
 
@@ -510,17 +510,17 @@ function setVisibleBoard(board, live){
    $('#cb_board').data('visible_board', board);
    renderBoard(board);
 
-   $('#cb_nav_first').attr('disabled', board['prior'] ? false : true);
-   $('#cb_nav_prev_turn').attr('disabled', board['prior'] ? false : true);
-   $('#cb_nav_prev_state').attr('disabled', board['prior'] ? false : true);
-   $('#cb_nav_next_state').attr('disabled', board['subsequent'] ? false : true);
-   $('#cb_nav_next_turn').attr('disabled', board['subsequent'] ? false : true);
+   $('#cb_nav_first').attr('disabled', board.prior ? false : true);
+   $('#cb_nav_prev_turn').attr('disabled', board.prior ? false : true);
+   $('#cb_nav_prev_state').attr('disabled', board.prior ? false : true);
+   $('#cb_nav_next_state').attr('disabled', board.subsequent ? false : true);
+   $('#cb_nav_next_turn').attr('disabled', board.subsequent ? false : true);
 
    if (live) {
       const liveBoard = $('#cb_board').data('board');
-      $('#cb_undo').attr('disabled', liveBoard['prior'] ? false : true);
-      $('#cb_redo').attr('disabled', liveBoard['subsequent'] ? false : true);
-      $('#cb_pass').attr('disabled', liveBoard['phantom'] ? true : false);
+      $('#cb_undo').attr('disabled', liveBoard.prior ? false : true);
+      $('#cb_redo').attr('disabled', liveBoard.subsequent ? false : true);
+      $('#cb_pass').attr('disabled', liveBoard.phantom ? true : false);
       $('#cb_nav_last').attr('disabled', true);
       $('#cb_board').addClass('cb-live');
       $('#cb_board').removeClass('cb-archive');
@@ -571,13 +571,13 @@ function putMeta(){
    var lightName = $('#cb_light_name').val();
    var darkName = $('#cb_dark_name').val();
    var meta = gun.get(PacoSakoUUID).get('meta').get(gameId);
-   var stat = (board['move'] && board['move']['took'] === 'k') ? 'mate' : null;
+   var stat = (board.move && board.move.took === 'k') ? 'mate' : null;
    meta.put({
       'gameId': gameId,
       'lightName': lightName,
       'darkName': darkName,
       'moves': countMoves(board),
-      'timestamp': board['timestamp'] || new Date().getTime(),
+      'timestamp': board.timestamp || new Date().getTime(),
       'status': stat,
    });
 }
@@ -608,18 +608,18 @@ function switchGameId(newId){
    $('#cb_board').removeData('skip_notify');
 
    gun.get(PacoSakoUUID).get('games').get(newId).on(function(d){
-      if (d && d['board'] && $('#cb_board').data('gameId') === newId) {
-         const board = JSON.parse(d['board']);
+      if (d && d.board && $('#cb_board').data('gameId') === newId) {
+         const board = JSON.parse(d.board);
          const cb_board = $('#cb_board').first();
-         if ($('#cb_notify')[0].checked && cb_board.data('skip_notify') !== d['board']) {
+         if ($('#cb_notify')[0].checked && cb_board.data('skip_notify') !== d.board) {
             /* ignore partial moves and undo/redo */
-            if (!board['phantom'] && !board['subsequent']) {
-               if (board['move'] && board['move']['took'] === 'k') {
-                  notify((board['move']['side'][0] === 'd' ? 'Dark' : 'Light') + ' player won!');
+            if (!board.phantom && !board.subsequent) {
+               if (board.move && board.move.took === 'k') {
+                  notify((board.move.side[0] === 'd' ? 'Dark' : 'Light') + ' player won!');
                } else {
-                  notify((board['player'][0] === 'd' ? 'Dark' : 'Light') + ' player\'s turn');
+                  notify((board.player[0] === 'd' ? 'Dark' : 'Light') + ' player\'s turn');
                }
-               $('#cb_board').data('skip_notify', d['board']);
+               $('#cb_board').data('skip_notify', d.board);
             }
          }
          setCurrentBoard(board);
@@ -628,8 +628,8 @@ function switchGameId(newId){
 
    gun.get(PacoSakoUUID).get('meta').get(newId).on(function(d){
       if (d && $('#cb_board').data('gameId') === newId) {
-         $('#cb_light_name').val(d['lightName'] || '');
-         $('#cb_dark_name').val(d['darkName'] || '');
+         $('#cb_light_name').val(d.lightName || '');
+         $('#cb_dark_name').val(d.darkName || '');
       }
    });
 
@@ -796,12 +796,12 @@ $(function (){
 
    $('#cb_pass').on('click', function(){
       var board = $('#cb_board').data('board');
-      if (!board['phantom']) {
+      if (!board.phantom) {
          var newBoard = cloneJSON(board);
-         newBoard['prior'] = board;
-         newBoard['move'] = { 'side': board['player'], 'pass': true };
-         newBoard['player'] = otherSide(board['player']);
-         newBoard['timestamp'] = new Date().getTime();
+         newBoard.prior = board;
+         newBoard.move = { 'side': board.player, 'pass': true };
+         newBoard.player = otherSide(board.player);
+         newBoard.timestamp = new Date().getTime();
          putState(newBoard);
       }
    });
@@ -857,32 +857,32 @@ $(function (){
    }
 
    gun.get(PacoSakoUUID).get('meta').map().on(function(d){
-      if (d && d['gameId']) {
-         const lightName = d['lightName'] ? d['lightName'] : 'Light';
-         const darkName = d['darkName'] ? d['darkName'] : 'Dark';
-         const moves = !d['moves'] ? '' :
-            (', ' + d['moves'] + (d['moves'] === 1 ? ' move' : ' moves'));
+      if (d && d.gameId) {
+         const lightName = d.lightName ? d.lightName : 'Light';
+         const darkName = d.darkName ? d.darkName : 'Dark';
+         const moves = !d.moves ? '' :
+            (', ' + d.moves + (d.moves === 1 ? ' move' : ' moves'));
 
-         var opt = $('#cb_game_' + d['gameId']);
+         var opt = $('#cb_game_' + d.gameId);
 
-         if (!(d['lightName'] || d['darkName']) && !d['moves'] && d['gameId'] !== $('#cb_board').data('gameId')) {
+         if (!(d.lightName || d.darkName) && !d.moves && d.gameId !== $('#cb_board').data('gameId')) {
             if (opt.length >= 1) {
                opt.remove();
             }
          } else {
             if (opt.length === 0) {
                opt = $('<option></option>');
-               opt.attr('id', 'cb_game_' + d['gameId']);
+               opt.attr('id', 'cb_game_' + d.gameId);
             }
 
             var stat = '';
-            if (d['status']) {
-               stat = ', ' + d['status'];
+            if (d.status) {
+               stat = ', ' + d.status;
             }
 
-            opt.data('gameId', d['gameId']);
+            opt.data('gameId', d.gameId);
             opt.data('title', lightName + ' vs. ' + darkName + moves + stat);
-            opt.data('then', d['timestamp'] || new Date().getTime());
+            opt.data('then', d.timestamp || new Date().getTime());
             opt.addClass('cb-game-option');
             opt.appendTo('#cb_select_game');
             updateTitle(opt);