This page explains how Spenser Minh M. Lam (USATT# 25844)'s rating went from 2178 to 2142 at the Illinois State Championship held on - 15 Dec 2012. 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.