This page explains how Jiaqi Zheng (USATT# 72386)'s rating went from 2463 to 2458 at the Butterfly Northern CA Spring O held on - 15 Apr 2007. 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.