anchor.diff:            td.A1(data-id='A1', draggable='true')
               a.white.rook(draggable='true') &#9814;
             td.B1(data-id='B1', draggable='true')
  -            a.white.night(draggable='true') &#9816;
  +            a.white.knight(draggable='true') &#9816;
             td.C1(data-id='C1', draggable='true')
               a.white.bishop(draggable='true') &#9815;
             td.D1(data-id='D1', draggable='true')
  -            a.white.king(draggable='true') &#9813;
  +            a.white.queen(draggable='true') &#9813;
             td.E1(data-id='E1', draggable='true')
  -            a.white.wife(draggable='true') &#9812;
  +            a.white.king(draggable='true') &#9812;
             td.F1(data-id='F1', draggable='true')
               a.white.bishop(draggable='true') &#9815;
             td.G1(data-id='G1', draggable='true')
  -            a.white.night(draggable='true') &#9816;
  +            a.white.knight(draggable='true') &#9816;
             td.H1(data-id='H1', draggable='true')
               a.white.rook(draggable='true') &#9814;
         table.chess_board.black(style='display: none;')
  
positive.code:           td.H1(data-id='H1', draggable='true')
              a.white.rook(draggable='true') &#9814;
            td.G1(data-id='G1', draggable='true')
              a.white.night(draggable='true') &#9816;
            td.F1(data-id='F1', draggable='true')
              a.white.bishop(draggable='true') &#9815;
            td.E1(data-id='E1', draggable='true')
  
negative.code:           td.C8(data-id='C8', draggable='true')
              a.black.bishop(draggable='true') &#9821;
            td.D8(data-id='D8', draggable='true')
              a.black.queen(draggable='true') &#9819;
            td.E8(data-id='E8', draggable='true')
              a.black.king(draggable='true') &#9818;
            td.F8(data-id='F8', draggable='true')
              a.black.bishop(draggable='true') &#9821;
            td.G8(data-id='G8', draggable='true')
  