This page explains how Rahul Chatwani (USATT# 81586)'s rating went from 501 to 499 at the ICC - Entry Level League event from 14 Dec 2010. 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.