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
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
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.
Get Understanding Chess Middle games by GM Nunn.
https://www.amazon.com/Understanding-Chess-Middlegames-John-Nunn/dp/1906454272