This page explains how John C. Fredrickson (USATT# 5901)'s rating went from 1534 to 1521 at the TCTTA Friday League event from 22 Nov 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.