This page explains how Andrew Nguyen (USATT# 93182)'s rating went from 1334 to 1319 at the OCTTA BUTTERFLY FIRST ANNUAL SENIORS OPEN held on 6 Oct 2023 - 8 Oct 2023. 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.