This page explains how Jim A. Engstrom (USATT# 70172)'s rating went from 1570 to 1552 at the West Michigan Table Tennis event from 11 Dec 2014. 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.