This page explains how Harold E. Fredrickson (USATT# 5900)'s rating went from 1150 to 1149 at the TCTTA Friday League event from 25 Jan 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.