This page explains how Kefei Mo (USATT# 217686)'s rating went from 1593 to 1551 at the VTTC weekly league event from 28 Sep 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.