This page explains how Ying Zhang (USATT# 90711)'s rating went from 666 to 667 at the Westchester 2013 June Open held on - 23 Jun 2013. 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.