This page explains how Kagan Feng (USATT# 218625)'s rating went from 544 to 531 at the ICC - Sunday Beginners League event from 28 Jan 2018. 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.