This page explains how Cecil Yeung (USATT# 75193)'s rating went from 1086 to 1080 at the Schaumburg Spring Open held on - 14 Mar 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.