This page explains how Hanson Qin (USATT# 81606)'s rating went from 440 to 550 at the 2011 West Coast Summer Open held on - 28 Aug 2011. 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.