This page explains how Hong-Zhong Zhang (USATT# 10140)'s rating went from 1865 to 1891 at the ICC - Advanced League event from 8 Aug 2015. 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.