This page explains how Roscoe Lock (USATT# 21921)'s rating went from 1790 to 1756 at the Rose City Open held on - 13 Jun 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.