reflexions

   1 tell opponent that I got the move, for him to start timer (and lose...)
   2   --> no, not needed and impossible if everybody is offline
   3     ==> just store this time locally (cheating possible but...)
   4 board2, board3, board4
   5 VariantRules2, 3 et 4 aussi
   6 fetch challenges and corr games from server at startup (room)
   7 but forbid anonymous to start corr games or accept challenges