Dives into complex endgames (King & Pawn, Rook & Pawn) and advanced openings like the Queen's Gambit and Slav. Volume 5: Advanced II:
Solid structured material, but check for legality of source
Rather than hunting for a potentially unsafe or illegal PDF file on obscure file-hosting sites, serious students are encouraged to look for the official digital version. These legal versions often come with interactive features: