This page explains how Arkadi Popov (USATT# 219562)'s rating went from 1141 to 1128 at the PTTC Saturday League event from 21 Dec 2019. 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.