This page explains how Robert Hershey (USATT# 70184)'s rating went from 1919 to 1899 at the Austin Table Tennis League event from 27 Dec 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.