This page explains how James S S Goodwin IV (USATT# 93421)'s rating went from 1899 to 1880 at the WCTTA Saturday League event from 18 Jan 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.