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/incinf.dir/bario.html
https://www.pychess.org/variant/manchu
https://discord.com/channels/686736099959504907/687076968046395410/735678637432635473 + Amazon Chess
https://www.pychess.org/variant/dobutsu
https://musketeerchess.net/games/musketeer/index.php Attention règle de promotion + SVG / PNG
https://musketeerchess.net/games/cerebral/rules/rules.php : from Titan, should be easy
https://www.pychess.org/variant/shogun
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
https://www.chessvariants.com/mvopponent.dir/hypnotic-chess.html
https://www.chessvariants.com/mvopponent.dir/mesmer-chess.html
http://history.chess.free.fr/rollerball.htm
Squatter Chess: safe on last rank = win
Companion Chess : pieces of same nature don't attack each others
https://www.chessvariants.com/difftaking.dir/brotherhood.html
Crossing Chess = win when the king cross half-board
Medusa Chess = Isardam
--> à chaque déplacement, check attaques directes + découvertes autour de case de départ dans 8 directions (pas caval)
Kingmaker: pawns can promote also into enemy king
--> no king tracking, getCheckSquares + underCheck test all kings
Eightkings: 8 pawns + 8 kings (non-royal until the last remains?)
--> yes seems better, no king tracking + no underCheck/...etc when >= 2 kings
https://www.jatektan.hu/_2018_vissza/2011_ig/uj2001/isakk1.html
https://boardgamegeek.com/boardgame/18661/alapo
Alapo is a strategy game. Each player owns twelve abstract pieces, two each of six different kinds. Round pieces move in any of the eight directions on the 6 by 6 board; square pieces move only orthogonally and triangular pieces only diagonally. Large pieces move any distance, small pieces only one field per turn.
Opponent pieces can be eliminated by moving onto their position. The goal is to reach the opponent's base line with one of your pieces without the opponent being able to eliminate your piece in his/her next move.
Maybe:
https://www.chessvariants.com/diffmove.dir/asymmetric.html
https://www.chessvariants.com/play/connected-chess
Non-chess:
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
gomoku, avalam, qoridor (wider lines in another color ?), draughts, draughts8
(puis quand hexaboards peut-être: hexavariants + Hex)