This page explains how Karthikeyan Thukkaram (USATT# 94138)'s rating went from 625 to 615 at the September Open held on - 12 Sep 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.