This page explains how Kui Zhang (USATT# 32162)'s rating went from 1867 to 1819 at the 2009 Alabama Closed held on - 25 Apr 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.