This page explains how Trung Nguyen (USATT# 198533)'s rating went from 1209 to 1221 at the BTTC League event from 19 Apr 2016. 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.