This page explains how Tingning Cheung (USATT# 27148)'s rating went from 1647 to 1649 at the LATTF event from 7 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.