This page explains how Merr W. Trumbore (USATT# 10675)'s rating went from 1996 to 1989 at the MATTC November Open held on - 17 Nov 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.