This page explains how Aleksandr Chaplin (USATT# 20727)'s rating went from 2013 to 1989 at the Minnesota Saturday Open event from 12 Feb 2011. 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.