This page explains how John P. Pratt (USATT# 9196)'s rating went from 1498 to 1430 at the USA National Table Tennis Cham held on - 22 Dec 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.