This page explains how John G. Vos (USATT# 10850)'s rating went from 1133 to 1131 at the MDTTC September Open held on - 21 Sep 1997. 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.