This page explains how Darryl Tsao (USATT# 98262)'s rating went from 621 to 619 at the ICC - Sunday Beginners League event from 31 Jan 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.