This page explains how Jonathan Junho Pak (USATT# 74222)'s rating went from 1569 to 1669 at the 2009 SOCAL Open held on - 4 Oct 2009. 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.