This page explains how William Lagozzino (USATT# 16801)'s rating went from 1308 to 1431 at the 1999 Seattle Open held on - 13 Jun 1999. 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.