This page explains how Ron Von Schimmelmann (USATT# 13637)'s rating went from 1920 to 1879 at the US Open TT Championship held on - 4 Jul 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.