If what is running behind the hood of the server interests you, I've made public my implementation of trueskill in Python. (Directly based on http://www.moserware.com/2010/03/comput ... skill.html).
https://bitbucket.org/thepilot/python-trueskill/src
It's commented, but I can explain you how it work if you have questions. (I recommend you to read the article before reading the code