This page explains how WILLIAM C. HALL (USATT# 6378)'s rating went from 1814 to 1807 at the AITTA event from 29 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.