An "unofficial" rating of players has been published online recently. I got a message per Facebook and looked in that web page. I play only in the sixth-highest badminton league (from 10), but I found myself in this rating, and there is even a separate ranking list for my league! The strength is calculated as number, I have about 1520 in singles and 1490 in doubles. Marc Zwiebler (german Nr. 1) has 1880 and 1800. I could also open all my matches in official tournaments of last years and how they affected my rating.
Does something similar exist for other countries and for international tournaments?
Yes, the search button is not actve for some reason. I open the ranking list of my district and see my name there among other plaers names, with numerical values. Than I click on the blue numbers of my rating and see the list of the opponents.
Not really, but thanks for trying to help! All rating systems are based on algorithms which are in some cases quite complicated. I'm familiar with ELO, Glinko and Microsoft's TrueSkill, but unless I can see the actual algorithms used in a system, it's hard to assess the system's validity. And trying to work out the algorithms from a small set of data is pretty tough!