This page explains how Hong Zhao (USATT# 4071)'s rating went from 2238 to 2230 at the Lake Havasu Open held on - 19 Sep 1999. 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.