This page explains how Alireza Khatibi (USATT# 214915)'s rating went from 1893 to 1878 at the Swan Sunday League event from 7 Oct 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.