This page explains how Tingning Cheung (USATT# 27148)'s rating went from 1681 to 1636 at the LATTF event from 12 Apr 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.