This page explains how Andrew Snyder (USATT# 1159)'s rating went from 1181 to 1156 at the Keystone State Games held on - 30 Jul 2006. 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.