This page explains how David Jarrin (USATT# 27909)'s rating went from 1645 to 1628 at the Maryland Giant RR held on - 24 Sep 2005. 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.