This page explains how Ray Huang (USATT# 81869)'s rating went from 1854 to 1849 at the LYTTC Friday Pro League event from 18 Oct 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.