This page explains how Willa Tammy Gu (USATT# 30325)'s rating went from 1905 to 1931 at the 2012 Berkeley Open on JOOLA North America Tour held on - 23 Sep 2012. 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.