This page explains how Arkadi Popov (USATT# 219562)'s rating went from 1225 to 1204 at the PTTC Saturday League event from 7 Apr 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.