This page explains how Piotr Soja (USATT# 82335)'s rating went from 1993 to 1931 at the Experior Club League event from 24 Nov 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.