Chess Openings

Volume A: Flank openings
English Opening
Benoni Defence
Dutch Defence
Réti Opening
Benko Gambit
Old Indian Defence
Bird's Opening
Anti-Indian systems (Trompowsky Attack, Torre Attack, Richter–Veresov Attack)
Irregular openings, etc.

Volume B: Semi-Open Games other than the French Defence
Sicilian Defence
Caro-Kann Defence
Pirc Defence
Alekhine's Defence
Modern Defence
Scandinavian Defence, etc.

Volume C: Open Games and the French Defence
Ruy Lopez
French Defence
Petrov's Defence
Vienna Game
Centre Game
King's Gambit
Philidor Defence
Italian (Giuoco Piano, Evans Gambit, Hungarian Defence, and Two Knights)
Scotch Game
Four Knights Game, etc.
King's Pawn Opening, etc. (covers unusual/rare 1. e4 openings such as the Elephant Gambit and Ponziani Opening).

Volume D: Closed Games and Semi-Closed Games
(including Grünfeld Defence but not other Indian Defenses)
Queen's Gambit
Accepted
Declined (Slav, Orthodox, Tarrasch, Tartakower, Albin Countergambit, etc.)
Grünfeld Defence
Queen's Pawn Game, etc.

Volume E: Indian Defences
(other than Grünfeld Defence and Old Indian Defence)
Nimzo-Indian Defence
Queen's Indian Defence
King's Indian Defence
Catalan Opening
Bogo-Indian Defence, etc.