This page explains how Qi Cai (USATT# 223588)'s rating went from 1571 to 1560 at the Spttc Wednesday night league event from 15 Jan 2020. 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.