This page explains how Chris Mosio (USATT# 28893)'s rating went from 1985 to 1988 at the LYTTC Friday Pro League event from 29 Sep 2017. 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.