This page explains how Sumit Chawla (USATT# 266554)'s rating went from 623 to 608 at the Pong Planet Friday Night, Tuesday Night, And Saturday Leagues event from 9 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.