This page explains how Ling Fan (USATT# 73523)'s rating went from 1899 to 1891 at the Central Carolinas Super League event from 21 May 2009. 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.