This page explains how Martin E. Staehlin (USATT# 26238)'s rating went from 887 to 847 at the Maryland Giant RR held on - 18 May 2002. 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.