This page explains how Joanna Sung (USATT# 82231)'s rating went from 1831 to 1818 at the ICC - Advanced League event from 19 Apr 2015. 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.