https://skydrive.live.com/redir?resid=E ... 3HtrCnDeSw
This is a link to a DVOA adjusted point average for every game involving the Seahawks and Redskins, weighted vs. overall team rank, overall defensive rank, and overall offensive rank.
(It's read only and has been virus checked, but as with any file on the internet it's better to view it through a browser plug-in, instead of downloading)
Bottom Line, I would say the score will be:
SEA - 24
WAS - 21
And because of 2 hours of obsessive compulsiveness you can make your predictions too!