This page explains how Oscar Ramirez (USATT# 26440)'s rating went from 1910 to 1905 at the Potomac Open held on - 14 Nov 2004. 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.