Chess Middlegame II v1.0.0 Mod APK Unlocked course composed by GM Alexander Kalinin is aimed at teaching a student much of the middlegame methods and intricacies through a theoretical section.
The following openings are viewed: Sicilian defense (Dragon, Najdorf, Paulsen variations), Ruy... http://www.apkformod.com/chess-middlegame-ii-v1-0-0-mod-apk-unlocked/