This page explains how Wei Chen (USATT# 78695)'s rating went from 2028 to 2031 at the ICC Juniors and Adults League event from 26 Sep 2009. The links below take you to pages that describe various aspects of the rating processor.

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.