This page explains how Nathan Wang (USATT# 220406)'s rating went from 1278 to 1249 at the ICC - Sunday Beginners League event from 21 Oct 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.