This page explains how Weida Qian (USATT# 30724)'s rating went from 1880 to 1889 at the Bill Mason Memorial Open held on - 17 Mar 2012. 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.