This page explains how John S. Roberge (USATT# 9493)'s rating went from 899 to 891 at the Eastern Korean Table Tennis Competition event from 1 Oct 2016. 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.