+r5k1/1R5p/3N4/4pP2/1p4P1/2p5/1rP1PKP1/8 w - - 0 1
+
Simultaneous games: view Game + Simultaneous, using component (One)Game
Storage: just key ID => IDs of actual games (in indexedDB)
In Hall challenge: acceptation on sender side (who launch the game when ready --> left click [which just delete if nobody registered, with confirm box])
https://www.chessvariants.com/mvopponent.dir/hypnotic-chess.html
https://www.chessvariants.com/mvopponent.dir/mesmer-chess.html
+https://brainking.com/en/GameRules?tp=47&fwa=ArchivedGame!g=8204276$i=1
+
+https://musketeerchess.net/games/cerebral/rules/rules.php
+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