PROBABLY WON'T FIX:
Embedded rules language not updated when language is set (in Analyse, Game and Problems)
If new live game starts in background, "new game" notify OK but not first move.

NEW VARIANTS:
https://www.pychess.org/variant/shogun
https://www.chessvariants.com/incinf.dir/bario.html
  https://www.chessvariants.com/index/listcomments.php?order=DESC&itemid=Bario
  https://www.bario-chess-checkers-chessphotography-spaceart.de/
  https://le-cdn.website-editor.net/20ef5f800ea646c29f6852cfc5ceda07/dms3rep/multi/opt/BAR028-e15a849c-960w.jpg

Non-chess: ( won't add draughts: https://lidraughts.org/ )
Gomoku, Konane
Fanorona https://fr.wikipedia.org/wiki/Fanorona
Yoté https://fr.wikipedia.org/wiki/Yot%C3%A9 http://www.zillionsofgames.com/cgi-bin/zilligames/submissions.cgi/92187?do=show;id=960