I came across lichess last year, incredible site with a good stack: Scala, Play framework and mithril.js for the client. Now please implement the top 64 chess v

I came across lichess last year, incredible site with a good stack: Scala, Play framework and mithril.js for the client. Now please implement the top 64 chess variants, like 5x6 chess or chess for 4 players, or modern day abstracts like Dvonn, Arimaa (not AI resistant anymore), Hive, Canon, The Duke, Tash-Kalar, Neuroshima Hex or Taj Mahal.