This page explains how Wei Fan (USATT# 1174574)'s rating went from 1279 to 1243 at the Butterfly Spin &Smash December Open held on 3 Dec 2022 - 4 Dec 2022. 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.