This page explains how Yahao Zhang (USATT# 31038)'s rating went from 2562 to 2552 at the 2013 Northern Open on JOOLA North America Tour held on - 28 Jul 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.