+getRepetitionStatus() lose or draw... (for some variants)
+Chakart: king remote capture, is an option if short range
+
WON'T IMPLEMENT:
Simultaneous games: view Game + Simultaneous, using component (One)Game
Storage: just key ID => IDs of actual games (in indexedDB)
Xiangqi
Synochess
EmpireChess
+Isardam (type B) : https://echekk.fr/spip.php?page=article&id_article=280
https://www.reddit.com/r/TotemChess/comments/imi3v7/totem_rules/
https://www.chessvariants.com/other.dir/fugue.html
https://www.chessvariants.com/rules/spartan-chess