This page explains how Isaac Tettey (USATT# 222581)'s rating went from 824 to 815 at the SpinBlock Monday Night League event from 25 Feb 2019. 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.