This page explains how Alex Laufer (USATT# 7581)'s rating went from 1599 to 1578 at the 35th St. Joeseph Valley Open held on - 16 Nov 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.