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This is a list of chess openings, organised by the Encyclopaedia of Chess Openings (ECO) code classification system.The chess openings are categorised into five broad areas ("A" through "E"), with each of those broken up into one hundred subcategories ("00" through "99").
The most important scheme of classifying chess openings for serious players is by ECO code, a series of 500 opening codes assigned by the Encyclopaedia of Chess Openings. Although these codes are invaluable for the serious study of the chess opening, they are not very practical for a broad survey of the chess opening as the codes obscure common ...
The example below is for the opening position, so no moves are shown in the heading. The first row provides the move numbers with subsequent rows representing different variations. Since the initial position is not always the opening position, these numbers will not always start at "1." White half-moves are shown above black half-moves.
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 the Sicilian Defence , Ruy Lopez , and Queen's Gambit , [ 1 ] as well as many minor variations of the main lines.
Opening book is often used to describe the database of chess openings given to computer chess programs (and related games, such as computer shogi). Such programs are quite significantly enhanced through the provision of an electronic version of an opening book. This eliminates the need for the program to calculate the best lines during ...
The Encyclopaedia of Chess Openings (ECO) is a reference work describing the state of opening theory in chess, originally published in five volumes from 1974 to 1979 by the Yugoslavian company Šahovski Informator (Chess Informant). It is currently undergoing its fifth edition.
The Four Knights Game is a chess opening that begins with the moves: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6. This is the most common sequence, but the knights may develop in any order to reach the same position. The opening is fairly popular with beginners who strictly adhere to the opening principle: "Develop knights before bishops."
The Exchange Variation of the Ruy Lopez is a chess opening that begins with the moves: 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6. Black may recapture on c6 with either pawn; although 4...bxc6 is playable, 4...dxc6 is almost always chosen at master level. Black has gained the bishop pair at the cost of a weakened pawn structure, having doubled pawns ...