This page explains how Raymond Zhu (USATT# 98266)'s rating went from 1279 to 1263 at the ICC - Sunday Beginners League event from 23 Sep 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.