This page explains how Hristo V Djoumaliev (USATT# 89637)'s rating went from 1660 to 1640 at the DTTA 1st Sanctioned Mensual of 2018 held on 11 Aug 2018 - 12 Aug 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.