This page explains how Yifan Guo (USATT# 273603)'s rating went from 1242 to 1234 at the San Francisco Bay Area CLC event from 18 Sep 2022. 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.