This page explains how Tan K. Nguyen (USATT# 85560)'s rating went from 1990 to 2025 at the 2023 Butterfly Texas Fall Open Tournament held on 11 Nov 2023 - 11 Nov 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.