This page explains how Reginald Willis (USATT# 11921)'s rating went from 1899 to 1806 at the 2012 Butterfly MDTTC Open held on - 6 May 2012. 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.