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Encyclopaedia Of Chess Openings




The Encyclopaedia of Chess Openings ('''ECO''') is a classification system for the opening moves in a game of chess. It is presented as a five volume book collection (now also a computer database) describing that concisely presents the best opening lines.

Instead of the traditional names for the openings, ECO has developed a unique coding system that has also been adopted by other chess publications. There are five main categories, "A" to "E", each of which is divided into one hundred sub-categories.


MAIN ECO CODES


See List Of Chess Openings for full details.


A


  • White first moves other than 1.e4, 1.d4: Irregular Openings (A00-A39)

  • 1.d4 without 1...d5, 1...Nf6: Atypical replies to 1.d4 (A40-A44)

  • 1.d4 Nf6 without 2.c4: Atypical replies to 1...Nf6 (A45-A49)

  • 1.d4 Nf6 2.c4 without 2...e6, 2...g6: Atypical Indian Systems (A50-A79)

  • 1.d4 f5: Dutch Defence (A80-A99)



B


  • 1.e4 without 1...c5, 1...e6, 1...e5 (B00-B19)

  • 1.e4 c5: Sicilian Defence (B20-B99)



C


  • 1.e4 e6: French Defence (C00-C19)

  • 1.e4 e5: Double King Pawn games (C20-C99)



D


  • 1.d4 d5: Double Queen Pawn games (D00-D69)

  • 1.d4 Nf6 2.c4 g6 with 3...d5: Grünfeld Defence (D70-D99)



E


  • 1.d4 Nf6 2.c4 e6: Indian Systems with ...e6 (E00-E59)

  • 1.d4 Nf6 2.c4 g6 without 3...d5: Indian systems with ...g6 (except Grünfeld) (E60-E99)



SEE ALSO




REFERENCES

  • ''Classification of Chess Openings'', Chess Inforamant, 1971



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