This page explains how Cosmo Pinkerton (USATT# 218068)'s rating went from 539 to 515 at the Pong Planet Friday Night, Tuesday Night, And Saturday Leagues event from 12 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.