This page explains how Hao Ling (USATT# 219506)'s rating went from 1209 to 1221 at the Austin Table Tennis League event from 22 Aug 2018. 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.