This page explains how John Mc Dermott (USATT# 93518)'s rating went from 2261 to 2250 at the 2021 February Open @ Princeton Pong held on 13 Feb 2021 - 14 Feb 2021. 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.