This page explains how Jolyn Lai (USATT# 95290)'s rating went from 490 to 467 at the ICC - Sunday Beginners League event from 19 Nov 2017. 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.