This page explains how John Zydell (USATT# 24233)'s rating went from 1639 to 1666 at the Maryland Giant RR held on - 23 Jun 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.