This page explains how Jacob Lee (USATT# 215212)'s rating went from 1839 to 1823 at the LYTTC Friday Pro League event from 7 Feb 2020. 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.