This page explains how James Winn (USATT# 60903)'s rating went from 1850 to 1820 at the SpinBlock Monday Night League event from 28 Sep 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.