This page explains how Ansel Yan (USATT# 1178710)'s rating went from 19 to n/a at the PTTC Saturday League event from 22 Jul 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.