This page explains how Bosman Botha (USATT# 219904)'s rating went from 949 to 948 at the WCTTA Saturday League event from 20 Oct 2018. 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.