This page explains how David Trykall (USATT# 73055)'s rating went from 1852 to 1935 at the 2009 Holiday Open Giant RR held on - 6 Dec 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.