This page explains how Qinghua Si (USATT# 211961)'s rating went from 1577 to 1566 at the RCTTC 2023 Spring RR Tournament held on 15 Apr 2023 - 15 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.