Encyclopaedia of Chess Openings

ECOECO codeECO'' codesEncyclopedia of Chess OpeningsC42C52C80D14D85D86
The Encyclopedia of Chess Openings (or ) is a classification system for the opening moves in chess.wikipedia
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Chess opening

openingopeningsopening moves
It is presented as a five-volume book collection (now also a computer database) describing chess openings.
Opening moves that are considered standard (often catalogued in a reference work such as the Encyclopaedia of Chess Openings) are referred to as "book moves", or simply "book".

Chess opening theory table

ECO'' tabletheory tabletheory tables
These openings are typically provided in an ECO table that concisely presents the best opening lines.
A chess opening theory table or ECO (Encyclopaedia Of Chess Openings) table presents lines of moves, typically (but not always) from the starting position.

Chess Informant

Šahovski Informator
The moves were taken from hundreds of thousands of games between masters, from published analysis in the Chess Informant since 1966, and then compiled by notable chess players.
Chess Informant (Šahovski Informator) is a publishing company from Belgrade (Serbia, former Yugoslavia) that periodically (since 2012, four volumes per year) produces a book entitled Chess Informant, as well as the Encyclopaedia of Chess Openings, Encyclopaedia of Chess Endings, Opening Monographs, other print publications, and software (including electronic editions of most print publications).

Benko Gambit

Benko Gambit
The Encyclopaedia of Chess Openings has three codes for the Benko Gambit:

Latvian Gambit

Openings such as the Latvian Gambit (1.e4 e5 2.Nf3 f5) and Grob's Attack (1.g4) are not given their own ECO code as in practice, they are almost never seen outside amateur-level play.
The ECO code for the Latvian Gambit is C40 (King's Knight Opening).

Bird's Opening

From's Gambit
Bird's Opening
The Encyclopaedia of Chess Openings assigns two codes for Bird's Opening: A02 (1.f4) and A03 (1.f4 d5).

Alekhine's Defence

AlekhineAlekhine DefenceTwo Knights Variation
Alekhine's Defence
The Encyclopaedia of Chess Openings has four codes for Alekhine's Defence, B02 through B05:

Ruy Lopez

Berlin DefenceBerlin Defence of the Ruy LopezMarshall Attack
Ruy Lopez
It is one of the most popular openings, with such a vast number of variations that in the Encyclopaedia of Chess Openings (ECO) all codes from C60 to C99 are assigned to them.

Algebraic notation (chess)

algebraic notationalgebraic chess notationalgebraic notation used for chess
The bulk of the book consists of diagrams of positions and chess moves in International figurine algebraic notation, with special symbols for comments about moves (see Chess annotation symbols).
Some texts, such as the Encyclopaedia of Chess Openings, omit any indication that a capture has been made.

English Opening

English1.c4English Opening, Symmetrical Variation
English Opening
The Symmetrical Defense (classified A30–39 in ECO), which is 1...c5, and is so named because both of the c-pawns are advanced two squares, maintaining symmetry.

Réti Opening

RétiRéti system
Réti Opening
In the Encyclopaedia of Chess Openings (ECO), Réti Opening is classified as codes A04–A09.

Old Indian Defense

Old IndianOld Indian Defence
Old Indian Defense
The opening is classified in the Encyclopaedia of Chess Openings with the codes A53–A55.

Philidor Defence

Philidor CountergambitA well-known chess openingPhilidor
Philidor Defence
The Encyclopaedia of Chess Openings code for Philidor Defence is C41.

Evans Gambit

Italian (Giuoco Piano, Evans Gambit, Hungarian Defense, and Two Knights)
The Encyclopaedia of Chess Openings has two codes for the Evans Gambit, C51 and C52.

Chess

chess playerchess gamewestern chess
The Encyclopedia of Chess Openings (or ) is a classification system for the opening moves in chess.
They are catalogued in reference works such as the Encyclopaedia of Chess Openings.

Grob's Attack

Grob1.g4
Openings such as the Latvian Gambit (1.e4 e5 2.Nf3 f5) and Grob's Attack (1.g4) are not given their own ECO code as in practice, they are almost never seen outside amateur-level play.
It is considered an irregular opening, so it is classified under the A00 code in the Encyclopaedia of Chess Openings.

Modern Defense

ModernAverbakh SystemModern or Robatsch Defence
Modern Defense
The Encyclopaedia of Chess Openings classifies the Modern Defense as code B06, while codes B07 to B09 are assigned to the Pirc.

Irregular chess opening

irregular openingirregularIrregular Openings
Irregular openings, etc.
Other opening moves by White, along with a few non-transposing lines beginning 1.g3, are classified under the code "A00" by the Encyclopaedia of Chess Openings and described as "uncommon" or "irregular".

Grünfeld Defence

GrunfeldGrünfeldGrünfeld, Exchange
Grünfeld Defence
The Grünfeld Defence (ECO codes D70–D99) is a chess opening characterised by the moves:

Nimzo-Indian Defence

Nimzo-IndianNimzo-Nimzo-Indian Defense
Nimzo-Indian Defence
In the Encyclopaedia of Chess Openings, the Nimzo-Indian is classified as E20–E59.

King's Pawn Game

1.e4e41. e2-e4
King's Pawn Opening, etc (covers unusual/rare 1. e4 openings such as the Elephant Gambit and Ponziani Opening).
The Encyclopedia of Chess Openings (ECO) classifies all King's Pawn Games into volumes B or C: volume C if the game starts with 1.e4 e6 (the French Defence) or 1.e4 e5; volume B if Black answers 1.e4 with any other move.

Petrov's Defence

Boden–Kieseritzky GambitPetroffPetrov's Three Knights Game
Petrov's Defence
The Encyclopaedia of Chess Openings codes for Petrov's Defence are C43 (for 3.d4) and C42 (for all other lines).

Four Knights Game

4.Nc3Four Knights Game, Spanish VariationFour Knights Opening
Four Knights Game, etc.
The ECO codes for the Four Knights Game are C49 (Symmetrical Variation, 4.Bb5 Bb4), C48 (4.Bb5 without 4...Bb4), C47 (4.d4 and others).

Scandinavian Defense

Scandinavian1...d5Marshall Gambit
Scandinavian Defense, etc.
The opening is classified under code B01 in the Encyclopaedia of Chess Openings.

King's Indian Defence

King's IndianKing's Indian DefenseIndian Game, West Indian Defence
King's Indian Defence
The Encyclopaedia of Chess Openings classifies the King's Indian Defence under the codes E60 through E99.