PORTLAND – The Spokane Chiefs prepared for the Western Hockey League Western Conference semifinals with a general, not a specific, approach. The Chiefs clinched their opening-round series against the Tri-City Americans on Saturday night, then waited 96 hours to learn their semifinal opponent. Kelowna’s overtime victory over Seattle on Wednesday night set up a best-of-seven conference semifinal between the Chiefs and the Portland Winterhawks, starting today at Veterans Memorial Coliseum and Saturday at the Rose Garden.