This page explains how Felix Dubinsky (USATT# 28275)'s rating went from 1821 to 1820 at the NJTTC Monday League event from 12 Feb 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.