This page explains how Rabah Shihab (USATT# 216529)'s rating went from 1249 to 1212 at the Swan Sunday League event from 21 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.