There is a master's database on here. Wouldn't that do the job? Us freeloaders can't access the full version of course, but you have a diamond membership. Use it! Someone just said Silman has a 100 lesson middle game course in chess mentor, again a good reason to have and use your diamond membership.
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Understanding Chess Middlegames by GM John Nunn
https://web.archive.org/web/20140627012322/http://www.chesscafe.com/text/hansen154.pdf
http://www.gambitbooks.com/pdfs/Understanding_Chess_Middlegames.pdf