This page explains how Reginald Tan (USATT# 275357)'s rating went from 1939 to 1978 at the LATTA Butterfly Open November 2023 held on 18 Nov 2023 - 18 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.