This page explains how David Jarrin (USATT# 27909)'s rating went from 1988 to 1952 at the MDTTC Butterfly Winter Open held on - 21 Jan 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.