This page explains how Alex Sumeri (USATT# 52673)'s rating went from 1690 to 1691 at the Pacific Northwest Early Summer held on - 1 Jul 2007. 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.