This page explains how Xiaofeng (frank Zhu (USATT# 27551)'s rating went from 1774 to 1755 at the 2018 Butterfly Labor Day Teams held on 1 Sep 2018 - 2 Sep 2018. 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.