This page explains how Willem Vandermeulen (USATT# 283319)'s rating went from 1589 to 1590 at the Mohawk Valley TTC League event from 24 Jun 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.