This page explains how Isaac Tettey (USATT# 222581)'s rating went from 837 to 833 at the SpinBlock Monday Night League event from 4 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.