This page explains how Willa Tammy Gu (USATT# 30325)'s rating went from 1891 to 1806 at the Pacific Coast Open held on - 27 Aug 2006. 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.