Changping Duan
USATT#: 49379
| Coach Level: State | Certified Umpire
2028 2009
2016 Butterfly WDCTT Open & Closed Championships
24 Sep 2016 - 25 Sep 2016
24 Sep 2016 - 25 Sep 2016
This page explains how Changping Duan (USATT# 49379)'s rating went from 2028 to 2009 at the 2016 Butterfly WDCTT Open & Closed Championships held on 24 Sep 2016 - 25 Sep 2016. The links below take you to pages that describe various aspects of the rating processor.
Introduction
Initial Rating
The rating 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.