This page explains how Lennox Douglas (USATT# 3212)'s rating went from 2033 to 2021 at the West Jersey Table Tennis Club League event from 21 May 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.