This page explains how Long Xiao (USATT# 152922)'s rating went from 1690 to 1679 at the SVTTC Sunday U2000 event from 6 Nov 2011. 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.