This page explains how Kei Wakabayashi (USATT# 75909)'s rating went from 1881 to 1817 at the Spttc Saturday Night League event from 9 Sep 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.