This page explains how Robert (Bobby) Ryberg (USATT# 43623)'s rating went from 1729 to 1717 at the 2000 USATT National Championsh held on - 17 Dec 2000. 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.