Chess Middle Game I is a completely free game, play addictive game, do not get too addicted.
Chess Middlegame I V 0.9.7 for Android 2.3.2+ Chess Middlegame I course composed by GM Alexander Kalinin is aimed at teaching a student much of the middlegame methods and intricacies through a theoretical section.
Typical Plans and Methods in the Most Popular Openings: Scotch, Ruy Lopez, Sicilian, Caro-Kann, French, English opening, Dutch, Slav, Catalan, Nimzo-Indian, King's Indian, Gruenfeld, Benko Gambit. The Encyclopedia of Middlegame course contains detailed material about typical pawn structures: Karlsbad, Hedgehog, etc.
This course is in the series Chess King Learn (http://www.apkbot.com