This page explains how Mike Sturtevant (USATT# 10052)'s rating went from 1257 to 1230 at the San Francisco Summer Open held on - 22 Aug 1999. 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.