This page explains how Amory A. Aldrich (USATT# 62984)'s rating went from 1215 to 1218 at the Waltham March Open held on - 30 Mar 1997. 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.