This page explains how Alan Zhang (USATT# 72576)'s rating went from 1878 to 1844 at the 77th Annual Michigan Closed held on - 1 May 2011. 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.