This page explains how Srinjoy Dutta (USATT# 85042)'s rating went from 878 to 827 at the ICC - Sunday Beginners League event from 20 Jan 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.