This page explains how David Guan (USATT# 217271)'s rating went from 1043 to 1048 at the HCTT Players Development League event from 15 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.