This page explains how Jon Eric Gustavson (USATT# 20075)'s rating went from 1494 to 1489 at the Gwinnett Table Tennis Club event from 13 May 2006. 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.