Source:http://ritastatusreport.blogspot.nl/2015/05/supertest-statistics.html
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Hello warriors,
大家嚎，

ever wondered what the mythical “supertest” is and how many players are there testing vehicles?
有没有想过这个“超测”到底是个什么神秘组织，而又是一群什么样的玩家在测试这些车？

Supertest is an assembly of regular players (not experts or professional) testing various WoT elements internally for Wargaming. In theory they are all under non-disclosure agreement but from the previous posts you can see how well that is working. Supertest is exclusively RU-server. There used to be an European supertest but it was closed two years ago after series of leaks.
答案很简单，超测只是一群普通玩家（不是大师，也不是专家）在给WG进行各种WOT元素的内部测试而已。理论上来说他们都是签了NDA（保密协议）的，但是最近几年超测服这泄露……大家也就知道这协议到底顶不顶用了。超测现在只有毛服有，以前还有欧服的超测服，但是在两年前由于一系列泄露事件的发生就关掉了。

The following post (leaked from supertest internal forums) shows the numbers and distribution of winrate amongst the supertesters. There are apparently 629 supertesters in total with such winrates (Marokko is supertester leader):
以下帖子（也是从超测服的内部论坛中泄露出来的）显示了超测玩家的人数和他们的胜率区间。超测玩家一共有629人，胜率分布如下（Marokko是超测的老大）
译注：X轴是胜率，Y轴是该胜率区间内的人数