This page explains how Reid Greenspan (USATT# 18298)'s rating went from 1566 to 1559 at the 2013 Valley of the Sun Open held on - 8 Dec 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.