This page explains how Aleksandr Chaplin (USATT# 20727)'s rating went from 1993 to 1973 at the Minnesota Super League event from 31 Mar 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.