Chess Openings Pro

Chess Openings and Book Moves

The Best Chess Openings – DataRemixed

learning - Where can I find free training tools like detailed annotated chess openings, middle games and endgames in the PGN format? - Chess Stack Exchange

Physics - Power laws in chess

Spreadsheet Library - Chess: Openings Database

Book Move - Chess Terms

Batsford chess openings 2 (The Macmillan chess library)

ChessAssistance.com Chess Openings 2003 Review

Caruana's approach to 1.c4 e5 Explained in an Opening Database by GM Boris Avrukh – Chessdom

Quick Course of Chess Openings