This page explains how Diana Chou (USATT# 69933)'s rating went from 455 to 451 at the Butterfly MDTTC Open held on - 12 Jun 2005. 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.