This page explains how John B. Allen (USATT# 3836)'s rating went from 2139 to 2091 at the Butterfly Thanksgiving Team Championships held on - 30 Nov 2014. 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.