Changping Duan
USATT#: 49379
| Coach Level: State | Certified Umpire
2023 2028
US Nationals
14 Dec 2015 - 18 Dec 2015
14 Dec 2015 - 18 Dec 2015
This page explains how Changping Duan (USATT# 49379)'s rating went from 2023 to 2028 at the US Nationals held on 14 Dec 2015 - 18 Dec 2015. 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.