This page explains how Kenneth M. Dukes (USATT# 43169)'s rating went from 1668 to 1689 at the Greater Columbia April Invitat held on - 26 Apr 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.