This page explains how W.E. Heinzelmann (USATT# 73449)'s rating went from 1212 to 1221 at the Butterfly/East Gate Open Serie held on - 15 Nov 2008. 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.