This page explains how Ark Sean Ouyang (USATT# 97418)'s rating went from 679 to 668 at the Topspin Open League event from 20 Nov 2015. 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.