This page explains how Yifan Guo (USATT# 273603)'s rating went from 1234 to 1234 at the San Francisco Bay Area CLC event from 1 Oct 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.