This page explains how Xiaofeng Guo (USATT# 34134)'s rating went from 1760 to 1749 at the 18th Annual Decatur Open held on - 15 Aug 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.