This page explains how Kenneth Lin (USATT# 229891)'s rating went from 1290 to 1289 at the Matchpoint TTC Friday League event from 28 Feb 2020. 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.