This page explains how Emiko Hosoya (USATT# 223357)'s rating went from 1300 to 1262 at the 2023 Best of the West Open & Giant Round Robin held on 25 Feb 2023 - 26 Feb 2023. 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.