This page explains how James Petrie (USATT# 55556)'s rating went from 1229 to 1084 at the Southern Arizona DHS Table Tennis League event from 26 Sep 2009. 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.