This page explains how Jim A. Engstrom (USATT# 70172)'s rating went from 1581 to 1561 at the 53rd Robo Pong St. Joseph Valley Open held on 18 Mar 2017 - 19 Mar 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.