This page explains how Hamid Khatibi (USATT# 216796)'s rating went from 1919 to 1891 at the ICC - Advanced League event from 8 Feb 2020. 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.