This page explains how Ella Zhou (USATT# 270725)'s rating went from 169 to 157 at the TTA Beg/Inter League - SATURDAY event from 25 Sep 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.