This page explains how Isha Bajpai (USATT# 96508)'s rating went from 18 to 4 at the ICC - Sunday Beginners League event from 27 Sep 2015. 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.