This page explains how Keegan Hsieh (USATT# 271992)'s rating went from 12 to n/a at the 888 League event from 28 Nov 2021. 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.