This page explains how Tri Minh Cao (USATT# 88530)'s rating went from 1242 to 1215 at the ICC - Sunday Beginners League event from 14 Jul 2019. 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.