TODO

   1 PROBABLY WON'T FIX:
   2 Embedded rules language not updated when language is set (in Analyse, Game and Problems)
   3 If new live game starts in background, "new game" notify OK but not first move.
   4
   5 NEW VARIANTS:
   6 https://www.chessvariants.com/incinf.dir/bario.html
   7 https://www.pychess.org/variant/manchu
   8 https://discord.com/channels/686736099959504907/687076968046395410/735678637432635473 + Amazon Chess
   9 https://www.pychess.org/variant/dobutsu
  10 https://musketeerchess.net/games/musketeer/index.php Attention règle de promotion + SVG / PNG
  11 https://musketeerchess.net/games/cerebral/rules/rules.php : from Titan, should be easy
  12 https://www.pychess.org/variant/shogun
  13 https://www.reddit.com/r/TotemChess/comments/imi3v7/totem_rules/
  14 https://www.chessvariants.com/other.dir/fugue.html
  15 https://www.chessvariants.com/rules/spartan-chess
  16 https://www.chessvariants.com/mvopponent.dir/hypnotic-chess.html
  17 https://www.chessvariants.com/mvopponent.dir/mesmer-chess.html
  18 http://history.chess.free.fr/rollerball.htm
  19 Squatter Chess: safe on last rank = win
  20 Companion Chess : pieces of same nature don't attack each others
  21 https://www.chessvariants.com/difftaking.dir/brotherhood.html
  22 Crossing Chess = win when the king cross half-board
  23 Kingmaker: pawns can promote also into enemy king
  24 --> no king tracking, getCheckSquares + underCheck test all kings
  25 Eightkings: 8 pawns + 8 kings (non-royal until the last remains?)
  26 --> yes seems better, no king tracking + no underCheck/...etc when >= 2 kings
  27 https://www.jatektan.hu/_2018_vissza/2011_ig/uj2001/isakk1.html
  28 https://boardgamegeek.com/boardgame/18661/alapo
  29 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.
  30 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.
  31 Maybe:
  32 https://www.chessvariants.com/diffmove.dir/asymmetric.html
  33 https://www.chessvariants.com/play/connected-chess
  34 Non-chess:
  35 fanorona https://fr.wikipedia.org/wiki/Fanorona
  36 Yoté https://fr.wikipedia.org/wiki/Yot%C3%A9 http://www.zillionsofgames.com/cgi-bin/zilligames/submissions.cgi/92187?do=show;id=960
  37 gomoku, avalam, qoridor (wider lines in another color ?), draughts, draughts8
  38 (puis quand hexaboards peut-être: hexavariants + Hex)