Is the Maasey SOS based on whom you've played or whom you've beaten? How is Ohio State's SOS not #1 if they've played #1 and # 3?
Massey has two SOS. They rate the schedule you've played and your final schedule. While Ohio St did play UConn and USCe (#1 and #3 as per Massey), they also played Belmont and Wagner (#166 and #323).
If you would like to read more about his system
http://www.masseyratings.com/theory/massey.htm#sched
The question of SOS has been debated a great deal on this board. Which is a stronger schedule, playing teams ranked #1, #2, #305 and #323 or playing teams ranked #89, #94, #181 and #192 ? The answer was generally thought to be, it depends on who is playing that schedule.
For a top 20 team, the first schedule presents more problems. 2 very difficult games and 2 easy wins. The second group would provide 4 very winnable games. For a team ranked #250, the first schedule would provide 2 losses and and 2 games they should win. The second group of games would provide 4 games they they would be an underdog in.