This page explains how Rudy Albert Hartmann (USATT# 23714)'s rating went from 1509 to 1507 at the San Diego TTA Winter Open held on - 21 Jan 1996. 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.