This page explains how WILLIAM C. HALL (USATT# 6378)'s rating went from 1789 to 1778 at the AITTA event from 8 Jun 2013. 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.