This page explains how Reid Greenspan (USATT# 18298)'s rating went from 1972 to 1963 at the 2018 Arizona Open & Giant Round Robin held on 24 Feb 2018 - 25 Feb 2018. 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.