This page explains how Sina Asadallahi (USATT# 87492)'s rating went from 2223 to 2221 at the Boston TTC event from 19 Jun 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.