This page explains how Alla Lantsman (USATT# 212702)'s rating went from 1809 to 1800 at the West Jersey Table Tennis Club League event from 20 Apr 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.