| Coach Level: State | Certified Umpire
24 Jun 2017 - 24 Jun 2017
This page explains how Changping Duan (USATT# 49379)'s rating went from 1993 to 2018 at the 2017 Butterfly WDCTT June Open held on 24 Jun 2017 - 24 Jun 2017. The links below take you to pages that describe various aspects of the ratings processor.
The ratings processor goes through 4 passes in order. The links take you to pages that provide detailed explanations of the calculations during each of the 4 passes.