This page explains how Lily Lu (USATT# 222167)'s rating went from 856 to 905 at the Butterfly Dec 2018 BTTC Open held on 14 Dec 2018 - 16 Dec 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.