This page explains how WILLIAM C. HALL (USATT# 6378)'s rating went from 1821 to 1825 at the AITTA event from 3 Apr 2011. 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.