This page explains how Jacob Lee (USATT# 215212)'s rating went from 1875 to 1863 at the LYTTC Friday Pro League event from 25 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.