TODO

   1 Dark Racing Kings ?
   2 Checkered-Teleport ?
   3
   4 // rem ref to bordContainer --> rethink CSS design...
   5
   6 // TODO: Otage, Emergo, Pacosako : fonction "buildPiece(arg1, arg2)" returns HTML element with 2 SVG or SVG + number
   7
   8 add mode diagram --> use vchess rules (only english? only french?)
   9 add variants : Chakart first (dark,cylinder)
  10
  11 Recycle : pawns fall out of board on 8th rank.
  12 captureKing : property, == this.taking || this.options["dark"]