This page explains how Billy Xu Ding (USATT# 71687)'s rating went from 2456 to 2406 at the Spttc Saturday Night League event from 20 May 2017. 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.