This page explains how Yahao Zhang (USATT# 31038)'s rating went from 2522 to 2509 at the RoboPong St. Joseph Valley Ope held on - 13 Mar 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.