This page explains how Konstantinos Nikopoulos (USATT# 229420)'s rating went from 2269 to 2258 at the MDTTC Tuesday/Friday League event from 25 Sep 2018. 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.