The opening is the initial stage of a chess game. It usually consists of established theory. The other phases are the middlegame and the endgame. Many...

The Encyclopaedia of Chess Openings (ECO) is a reference work describing the state of opening theory in chess, originally published in five volumes from...

This is a list of chess openings, organised by the Encyclopaedia of Chess Openings (ECO) code classification system. The chess openings are categorised...

The game of chess is commonly divided into three phases: the opening, middlegame, and endgame. There is a large body of theory regarding how the game should...

This article uses algebraic notation to describe chess moves. In chess, an irregular opening is an opening considered unusual or unorthodox. In the early...

A chess opening book is a book on chess openings. This is by far the most common type of literature on chess. These books describe many major lines, like...

unorthodox chess pieces, see Fairy chess piece; for a list of terms specific to chess problems, see Glossary of chess problems; for a list of named opening lines...

The English Opening is a chess opening that begins with the move: 1. c4 A flank opening, it is the fourth most popular and, according to various databases...

The Caro–Kann Defence is a chess opening characterised by the moves: 1. e4 c6 The Caro–Kann is a common defence against 1.e4. It is classified as a Semi-Open...

The Réti Opening is a hypermodern chess opening whose "traditional" or "classic method" begins with the moves: 1. Nf3 d5 2. c4 White attacks Black's pawn...