This page explains how Glenn Wambold (USATT# 12851)'s rating went from 870 to 861 at the AZ PTTC Wednesday event from 26 Jan 2012. 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.