This page explains how Li Ma (USATT# 196250)'s rating went from 1853 to 1821 at the 2024 March Open @ Princeton Pong held on 3 Mar 2024 - 3 Mar 2024. 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.