This page explains how Parvinder Singh (USATT# 1173378)'s rating went from 1965 to 1959 at the BTTC League event from 3 Dec 2019. 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.