This page explains how Bob Preston (USATT# 72720)'s rating went from 1252 to 1202 at the Huntsman World Senior Games held on - 10 Oct 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.