This page explains how Weida Qian (USATT# 30724)'s rating went from 1851 to 1846 at the 20th Bob Viducich Stiga Pacifi held on - 2 Nov 2008. 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.