This page explains how Ion Diaconescu (USATT# 198078)'s rating went from 1510 to 1501 at the Central Carolinas Super League event from 21 Oct 2021. 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.