This page explains how Allen Van (USATT# 220800)'s rating went from 1089 to 1087 at the Spttc Saturday Night League event from 16 Dec 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.