This page explains how Stefano Ratti (USATT# 25847)'s rating went from 2259 to 2268 at the MDTTC Saturday League event from 31 May 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.