This page explains how Tsz Lun (Alan) Chu (USATT# 79092)'s rating went from 2133 to 2131 at the 2013 Missouri Winter Games Open held on - 9 Feb 2013. 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.