This page explains how James Winn (USATT# 60903)'s rating went from 1889 to 1871 at the SpinBlock Monday Night League event from 3 May 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.