anchor.diff:    board.position(game.fen());
   };
   
  -var updateStatus = function() {
  +var updateStatus = function(source, target) {
     var status = '';
   
     var moveColor = 'White';
  
positive.code:   // illegal move
    if (move === null) return 'snapback';
  
    updateStatus();
  };
  
  // update the board position after the piece snap
  
negative.code:   statusEl.html(status);
    fenEl.html(game.fen());
    pgnEl.html(game.pgn());
    $('#move-notation').val(source + '-' + target);
    $('#move-piece').val(game.fen());
    $('#move-user').val('<%= current_user.id %>')
    $('#move-submit').submit();
  };
  