This page explains how Su Feng Liu (USATT# 7821)'s rating went from 1667 to 1691 at the 2011 Potomac Spring Open held on - 15 May 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.