This page explains how Jim A. Engstrom (USATT# 70172)'s rating went from 1520 to 1509 at the West Michigan Table Tennis event from 15 Dec 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.