This page explains how XICHEN SONG (USATT# 278363)'s rating went from 30 to 38 at the ICC - Sunday Beginners League event from 10 Dec 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.