This page explains how John J.W. Duncan (USATT# 1857)'s rating went from 1987 to 2025 at the Fall Open TTT held on - 10 Nov 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.