This page explains how Chenguang Zhu (USATT# 91100)'s rating went from 1589 to 1575 at the SVTTC Sunday U2000 event from 14 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.