Opening books

"Play the opening like a book, the middle game like a magician, and the endgame like a machine." - Spielmann

General opening guides

General chess openings books (8)

D4 opening guides

Trompovsky  (3) English defence (2)
Nimzo Indian (6) Kings Indian (8)
Queens Gambit declined (3) Dutch Defence (3)
Slav defence (3) Queens Gambit accepted (6)
Chigorin (1) Budapest gambit (1)
Benko Gambit (4) Gruenfeld (3)
Queens Indian (3) Catalan (8)

E4 opening guides

Ruy Lopez (11) Vienna (3)
The Latvian Gambit (2) Phildor defence (1)
Petroff defence (4) Ponziani (2)
Scotch (8) Sicilian (50)
French (18) Caro-Kann (15)
Pirc (11) Kings Gambit (2)
Alekhine defence (1)  

Other 1st move choices

English opening (1 c4) (15) Reti opening (1 Nf3) (2)
Kings Indian Attack (7)