This page explains how James Petrie (USATT# 55556)'s rating went from 1264 to 1261 at the Southern Arizona DHS Table Tennis League event from 7 Feb 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.