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.chessvariants.com/crossover.dir/football.html
  ballon vers n'importe laquelle de nos pièces = 'j'ai terminé mes passes, à toi'
  Also: rename current Football into Squatter2 (and Squatter into Squatter1)
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/ )
Avalam, 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
Qoridor: reserve moves to place the walls, convention from left / from top