This page explains how Ayan Kumar Bagchi (USATT# 76908)'s rating went from 1789 to 1758 at the Butterflly MDTTC September Ope held on - 13 Sep 2009. 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.