This page explains how Robert W. H. Ho (USATT# 6684)'s rating went from 1691 to 1672 at the Portland Double RR, U.S. Open held on - 6 Jun 1998. 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.