This page explains how Sonny Le (USATT# 130187)'s rating went from 897 to 891 at the SVTTC Sunday U2000 event from 13 May 2013. 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.