Issue: embedded rules language not updated when language is set (in Analyse, Game and Problems)
Also: if new live game starts in background, "new game" notify OK but not first move (not too serious however)

https://www.chessvariants.com/crossover.dir/koopachess.html
--> Can a stunned piece capture? Maybe not. ...recover? After 5 moves? Never?
+ Chakart :)

https://www.chessvariants.com/diffmove.dir/checkers.html --> "Forward"
in 1974 by Hans Multhopp

Clorange:
Clockwork Orange Chess (Fergus Duniho,
1999). https://www.chessvariants.com/other.dir/clockworkorange.html
implem : pieces code, yellow/red, easy

https://www.chessvariants.com/difftaking.dir/replacement.html

https://www.chessvariants.com/other.dir/pocket.html
https://www.chessvariants.com/other.dir/fugue.html
https://www.chessvariants.com/rules/spartan-chess
https://www.chessvariants.com/mvopponent.dir/avalanche.html

https://www.chessvariants.com/mvopponent.dir/hypnotic-chess.html
https://www.chessvariants.com/mvopponent.dir/mesmer-chess.html

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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
gess https://en.wikipedia.org/wiki/Gess
weiqi (check if landed stone captures, walk on connected components), go13, go9, gomoku, reversi
  first click show the stone, second click confirm the move?
avalam, qoridor, xiangqi, draughts, draughts8
(puis quand hexaboards peut-être: hexavariants + Hex)
Byo-yomi possible: 1h+b15,5m (15 pierres 5 minutes)