Shangri-La in Yunnan is known as the city in China, in which one can extend his tourist visa easiest. We got our extension, would have saved us with the right information, but some routes. So here's our report.
First you should make sure, that the Hotel / Guesthouse login / registration (score) has carried out correctly to the police and can give a receipt. With this document you go to the police and exchanges it against an official certificate of registration (registration slip) a. We were only without the certificate of registration by the police in PSB, because we were told, the document from the Guest House would be enough. We were sent away again.