-For animation, moves should contains "moving" and "fading" maybe...
-(But it's really just for Magnetic chess)
-setInterval "CRON" task in sockets.js to check connected clients
-(every 1hour maybe, or more)
-Button to show all pieces that can move (next to expert mode; change icons)
-Style (crazyhouse): ghost image of reserve pieces are initially translated
-Some bots are very weak, others quite slow...
+Full detection of repeated positions (including turn)
+In UltimaChess, consider these rules modifications: http://www.inference.org.uk/mackay/ultima/ultima.html
+Reintroduce isAttackedBy in Ultima, and fix it for pawns --> underCheck + stalemate
+--> take into account that an immobilized piece does not give check.
+(chameleons cannot be immobilized)