This page explains how Shishir Mahajan (USATT# 197089)'s rating went from 2001 to 1981 at the Boston TTC event from 18 Apr 2017. 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.