This page explains how John McCray (USATT# 77309)'s rating went from 264 to 309 at the 2009 Spinathon held on - 24 May 2009. 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.