This page explains how Weida Qian (USATT# 30724)'s rating went from 1938 to 1880 at the 2011 Pacific Rim Open held on - 6 Nov 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.