This page explains how John Andrade (USATT# 3893)'s rating went from 2048 to 2039 at the January Westfield Open held on - 18 Jan 1998. 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.