This page explains how Changlin Ma (USATT# 218797)'s rating went from 1245 to 1246 at the ICC - Sunday Beginners League event from 25 Feb 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.