This page explains how Terry Peng (USATT# 277513)'s rating went from 191 to 180 at the ICC - Sunday Beginners 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.