This page explains how Donald Feltenberger (USATT# 55196)'s rating went from 1243 to 1207 at the Westchester September 2020 Little Open held on 26 Sep 2020 - 27 Sep 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.