This page explains how Isabella W. Zai (USATT# 1157628)'s rating went from 1874 to 1867 at the Boston TTC event from 9 Feb 2024. 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.