-1) abort / draw / resign: pass to opponent if online, store in game if corr
-2) styling: connection indicator, names, put movesList + chat in better positions
-3) complete translations, stylesheets, variants rules ...
---> publish
-Later: implement analyze from position, multiple connections per SID ("double" games, simul games...)
- (to allow problems links in forum)
+Checkered chess: need another FEN element, last non-capturing checkered move (if applicable)
+ + need to stack these indicators for alpha beta search
+MarseilleChess: revise bot and test
+Translations (including About page), refresh rules