This page explains how Des Preston (USATT# 73084)'s rating went from 1290 to 1287 at the GVTTC April 2 Person Team Cham held on - 28 Apr 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.