Hello Alf,
It would be a good idea to improve the user's rating system.
First, it would be great if the user could have different ratings to different chessbases.
There is also a better system to calculate the rating: Giving rating to the users and also to the problems.
Here there is a free code:
http://www.glicko.net/glicko.html
There is also a tactics app than you can try to have new ideas:
http://innokuo.altervista.org/chesshero.html
Tactic ratings
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