Changping Duan
USATT#: 49379
| Coach Level: State | Certified Umpire
2117 2115
Potomac Fall Open
- 22 Nov 1998
- 22 Nov 1998
This page explains how Changping Duan (USATT# 49379)'s rating went from 2117 to 2115 at the Potomac Fall Open held on - 22 Nov 1998. 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.