This page explains how Alex Osmanoff (USATT# 93496)'s rating went from 1231 to 1207 at the LYTTC Friday Pro League event from 2 Sep 2015. 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.