This page explains how Xujing Zhang (USATT# 199299)'s rating went from 784 to 771 at the ICC - Sunday Beginners League event from 2 Oct 2016. 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.