This page explains how Derek Nie (USATT# 77564)'s rating went from 1848 to 1851 at the MDTTC Saturday League event from 25 Sep 2011. 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.