This page explains how Thomas Fersch (USATT# 219939)'s rating went from 1986 to 1979 at the WCTTA Saturday League event from 25 May 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.