This page explains how Adam Fan (USATT# 217518)'s rating went from 1091 to 1085 at the HCTT Players Development League event from 22 Dec 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.