This page explains how Ted H. Hackler (USATT# 13019)'s rating went from 821 to 841 at the Chedrac TT Center Fall Open held on - 27 Sep 1997. 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.