This page explains how Joyce Arpon (USATT# 31677)'s rating went from 1342 to 1300 at the 2014 US National Championships held on - 20 Dec 2014. 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.