-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
+Full detection of repeated positions (including turn)
+Debug HalfChess
+Implement UltimaChess