This page explains how Lee E. Sumner (USATT# 48064)'s rating went from 1657 to 1690 at the Maryland May Circuit held on - 2 May 1999. 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.