This page explains how John Chan (USATT# 1167475)'s rating went from 903 to 860 at the 2023 Aurora Fall Open held on 25 Nov 2023 - 26 Nov 2023. 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.