This page explains how John C. Fredrickson (USATT# 5901)'s rating went from 1543 to 1531 at the TCTTA Friday League event from 9 Jan 2015. 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.