This page explains how Merr W. Trumbore (USATT# 10675)'s rating went from 1689 to 1683 at the Maryland Giant RR held on - 21 Jan 2012. 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.