This page explains how Tim Gillespie (USATT# 121311)'s rating went from 1521 to 1515 at the SpinBlock Monday Night League event from 28 Dec 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.