This page explains how Brian Annest (USATT# 69907)'s rating went from 1893 to 1878 at the AZ PTTC Monday event from 4 Oct 2010. 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.