30 Oct 2021 - 31 Oct 2021
This page explains how Michael Song (USATT# 94940)'s rating went from 1998 to 1986 at the Westchester 2021 October Open held on 30 Oct 2021 - 31 Oct 2021. The links below take you to pages that describe various aspects of the ratings processor.
The ratings 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.