This page explains how John Nagel (USATT# 30131)'s rating went from 1290 to 1288 at the Piedmont TTC RR Open held on - 6 Sep 2003. 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.