This page explains how Peter Turchi (USATT# 13242)'s rating went from 1600 to 1550 at the Butterfly Open on the North Am held on - 30 Apr 2000. 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.