This page explains how Cosmo Pinkerton (USATT# 218068)'s rating went from 1540 to 1508 at the WCTTA Saturday League event from 15 Feb 2020. 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.