This page explains how Aleksandr Chaplin (USATT# 20727)'s rating went from 1955 to 1928 at the Minnesota Saturday Open event from 21 Jan 2012. 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.