This page explains how Yuanlei Zhang (USATT# 1167098)'s rating went from 687 to 667 at the ICC - Sunday Beginners League event from 28 Apr 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.