-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)
-Systematically show init+dest squares in PGN, maybe after short notation
-(2 moves list, second for de-ambiguification)
+Beautify styles
+Translations ? (probably not)
+Fill some puzzles: http://www.logicmazes.com/games/puz1to4.html