This page explains how John R Gardiner (USATT# 80691)'s rating went from n/a to 894 at the 2009 Under 1200 held on - 15 Aug 2009. 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.