This page explains how Fumio Yoshikawa (USATT# 11352)'s rating went from 1683 to 1667 at the St. Louis Round Robin Spring O held on - 30 Apr 1994. 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.