This page explains how Ivan Kerns (USATT# 42157)'s rating went from 1503 to 1449 at the Keystone State Games held on - 29 Jul 2007. 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.