This page explains how Ray Huang (USATT# 81869)'s rating went from 1583 to 1580 at the LYTTC Friday Pro League event from 30 Aug 2014. 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.