This page explains how Alan Chen (USATT# 88147)'s rating went from 1260 to 1234 at the LYTTC Friday Pro League event from 17 Nov 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.