This page explains how James Edmond (USATT# 12114)'s rating went from 1220 to 1230 at the Columbus Giant RR Open held on - 22 Feb 2003. 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.