This page explains how David Akerman (USATT# 30223)'s rating went from 1290 to 1270 at the Pong Planet Friday Night, Tuesday Night, And Saturday Leagues event from 20 Nov 2018. 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.