This page explains how Danian Gong (USATT# 268535)'s rating went from 663 to 652 at the ICC - Sunday Beginners League event from 16 Feb 2020. 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.