Sicilian Najdorf (Advanced)
The complete Black-side Najdorf: ten branches from 5...a6 — English Attack (vs ...e5 and vs ...e6), 6.Bg5 main, the Opocensky 6.Be2, Fischer-Sozin 6.Bc4, Adams 6.h3, Fianchetto 6.g3, Amsterdam 6.f4, Anti-Najdorf 6.a4 and the quiet 6.Be2/Scheveningen transposition — each drilled twenty book moves deep.
The Najdorf is the most-played and most-respected weapon in chess — Fischer, Kasparov, Polgar, Carlsen, Anand and Vachier-Lagrave have all built their Black repertoires on 5...a6. This pack drills the ten White tries you actually meet: the two English Attack lines (6.Be3 vs ...e5 and vs ...e6), the classical 6.Bg5, the venerable Opocensky 6.Be2 e5, the sharp Fischer-Sozin 6.Bc4, plus the modern sidelines 6.h3, 6.g3, 6.f4, 6.a4 and the quiet 6.Be2 e6 Scheveningen transposition. Twenty book moves per drill, forty exam positions covering the critical decisions — when to trade on d5, when to break with …d5, when to expand …b5/…b4, when to reroute the knight to c4. Finish the pack and you are not memorising moves, you are playing the Najdorf.