This page explains how Hsu-Chang Lu (USATT# 84845)'s rating went from 1665 to 1628 at the LYTTC February Open held on - 1 Feb 2015. 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.