This page explains how Dariah Feng (USATT# 224231)'s rating went from 660 to 658 at the ICC - Sunday Beginners League event from 18 Aug 2019. 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.