This page explains how Eric J. Ziegler (USATT# 88227)'s rating went from 971 to 970 at the Tucson Table Tennis Club League event from 28 Apr 2012. 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.