This page explains how Sergey Povzner (USATT# 140313)'s rating went from 877 to 855 at the 888 League event from 1 Oct 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.