This page explains how Reginald Willis (USATT# 11921)'s rating went from 1931 to 1931 at the Club Joola Presidents Day Open held on - 17 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.