This page explains how Joanna Sung (USATT# 82231)'s rating went from 1904 to 1904 at the ZXTTA event from 13 Dec 2014. 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.