This page explains how Bosman Botha (USATT# 219904)'s rating went from 1230 to 1230 at the Swan Sunday League event from 25 Aug 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.