This page explains how Rachel Jiayu Sung (USATT# 82232)'s rating went from 1663 to 1660 at the ICC - Advanced League event from 21 Jan 2013. 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.