This page explains how Chris Mosio (USATT# 28893)'s rating went from 2061 to 2019 at the LYTTC Friday Pro League event from 1 Dec 2023. 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.