This page explains how Solon Yiu (USATT# 82146)'s rating went from 547 to 542 at the ICC - Entry Level League event from 29 Jun 2010. 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.