This page explains how Kenny Duong Au (USATT# 223163)'s rating went from 1969 to 1981 at the 2021 US National TT Championships California State Qualifier held on 16 Apr 2021 - 18 Apr 2021. 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.