This page explains how Alex Osmanoff (USATT# 93496)'s rating went from 866 to 858 at the LYTTC Friday Pro League event from 13 Jul 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.