This page explains how Derek Y Wang (USATT# 1172858)'s rating went from 1879 to 1878 at the LYTTC Friday Pro League event from 1 Sep 2023. 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.