This page explains how James S S Goodwin IV (USATT# 93421)'s rating went from 1893 to 1890 at the Swan Sunday League event from 17 Feb 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.