This page explains how Aleksandr Chaplin (USATT# 20727)'s rating went from 1938 to 1918 at the Minnesota Saturday Open event from 9 Mar 2013. 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.