This page explains how Sam Hsieh (USATT# 124821)'s rating went from 1834 to 1809 at the SVTTC Sunday U2000 event from 11 Jan 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.