This page explains how Brian Hutchins-Knowle (USATT# 62550)'s rating went from 1666 to 1638 at the ICC - Advanced League event from 5 Oct 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.