This page explains how Liem Tran (USATT# 148855)'s rating went from 1321 to 1231 at the PTTC Saturday League event from 15 Aug 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.