This page explains how John C. Fredrickson (USATT# 5901)'s rating went from 1571 to 1563 at the TCTTA Friday League event from 8 Mar 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.