This page explains how Andy Zhang (USATT# 216349)'s rating went from 163 to 153 at the TTA Beg/Inter League - SATURDAY event from 16 Dec 2017. 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.