This page explains how Rabah Shihab (USATT# 216529)'s rating went from 1272 to 1248 at the Swan Sunday League event from 3 Dec 2017. 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.