These seats are near-impossible to get. I have booked 6 months out before, and these seats were still already selected or blocked by the airline. It's so frustrating as I pay full fare for my tickets. I have no status with Swiss or StarAlliance, so I always go to ExpertFlyer and put a "seat alert" in for my preferred seats. Then I get an email when these seats open up. It's worked for me half the time.