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 Serbian company Šahovski Informator (Chess Informant). It is currently undergoing its fifth edition. ECO may also refer to the opening classification system used by the encyclopedia.
This article uses algebraic notation to describe chess moves.
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The EncyclopaediaofChessOpenings (ECO) is a reference work describing the state ofopening theory in chess, originally published in five volumes from...
openings are not popular with chess players, the standard opening references such as Modern ChessOpenings (MCO) and EncyclopaediaofChessOpenings (ECO)...
A chessopening book is a book on chessopenings. This is by far the most common type of literature on chess. These books describe many major lines, like...
code in the EncyclopaediaofChessOpenings. This article uses algebraic notation to describe chess moves. One of the earliest opening plays of b4 was by...
A chessopening theory table or ECO table (EncyclopaediaofChessOpenings) presents lines of moves, typically (but not always) from the starting position...
irregular opening, classified as A00 by the EncyclopaediaofChessOpenings. This article uses algebraic notation to describe chess moves. This opening became...
to C54 in the EncyclopaediaofChessOpenings. This article uses algebraic notation to describe chess moves. The Giuoco Piano is one of the oldest recorded...
irregular opening, so it is classified under the A00 code in the EncyclopaediaofChessOpenings. This article uses algebraic notation to describe chess moves...
the A00 code in the EncyclopaediaofChessOpenings. This article uses algebraic notation to describe chess moves. The Ware Opening attacks the b5-square...
C65–C67 in the EncyclopaediaofChessOpenings. The code C65 covers White moves other than 4.0-0, such as 4.d3 (4.Nc3 is considered a variation of the Four...
Game) is a chessopening characterized by the moves: 1. e4 d5 This opening is classified under code B01 in the EncyclopaediaofChessOpenings. The Scandinavian...
2.c4 e6 3.g3, although various other openings can transpose into the Catalan. The EncyclopaediaofChessOpenings (ECO) lists codes E01–E09 for lines with...
considered an irregular opening and is classified under the code A00 (miscellaneous first moves by White) in the EncyclopaediaofChessOpenings. This article uses...
Game is a family ofchessopenings beginning with the moves: 1. e4 e5 2. Nf3 Nc6 3. Bc4 This opening is defined by the development of the white bishop...
positional play, though there are some sharp variations. The EncyclopaediaofChessOpenings has three codes for the Four Knights Game: C49: 4.Bb5 Bb4 (Symmetrical...
(irregular openings or uncommon openings) in the EncyclopaediaofChessOpenings. This article uses algebraic notation to describe chess moves. Of the twenty...