This page explains how Jim A. Engstrom (USATT# 70172)'s rating went from 1573 to 1553 at the WMITT event from 23 Jan 2020. 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.