This page explains how Robert W. H. Ho (USATT# 6684)'s rating went from 1619 to 1615 at the Portland State Open held on - 24 Aug 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.