This is currently in reverse order, according to the trueskill.org API:
expose(rating)
Returns the value of the rating exposure. It starts from 0 and converges to the mean. Use this as a sort key in a leaderboard:
leaderboard = sorted(ratings, key=env.expose, reverse=True)
New in version 0.4.
This is currently in reverse order, according to the trueskill.org API: