This page explains how John Oros (USATT# 53699)'s rating went from 1823 to 1811 at the St. Louis Gateway Open held on - 6 Aug 2000. 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.