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spurtus 34 ( +1 | -1 )
ECO codes Does anybody understand ECO codes?

What exactly do they represent?

i.e. What is Set A as opposed to set B?

What are they basic use?

What are there vastly more ECO codes for some openings as opposed to others?
lots of English and Sicilian but only one entry for the Saragossa Opening. Is this basically due to GM popularity?

Thanks,
Spurtus
tyekanyk 44 ( +1 | -1 )
Code A stands for the english opening, dutch, benoni and other non-central openings. Code B stands for semi-open games, excluding the french defense. Code C stands for the french and for open games. Code D stands for closed games and for the Grunfeld. Code E stands for Nimzo\Queen indian defense and KID. The reason for a lot of popularity in some openings is indeed GM practice, so that's why 80% in the B volume is devoted to the sicilian defense.
basti1981 131 ( +1 | -1 )
helpful link www.chessgames.com/chessecohelp.html

there you have an overview over the opening keys

generally speaking the C volume will deal with the open games (e4 e5) and the french defence
B will deal with the semi-open games (e4 not e5) except french of course (french is in the volume D for what reason so ever)
volume D will deal with the closed games (d4 d5), like all the variations of the queens gambit (slav, semi-slav and so on and so forth) the Grunfeld Indian is also included in the volume D (I'm not fully convinced that the Grunfeld Indian should be listed in the volume D, but that the way things are)
Volume E is more or less dealing with the other Indian defences (KID, QID, NID, Bogo Indian) volume E includes the Catalan (Queen's Gambit), I also don't think, that listing the Catalan under E is fully convincing, but ok, that's the way it is.

Volume A Includes all the other openings not listed under B-E like games starting with 1. d4 or 1. e4 (like English, Reti or Bird's Opening) as well as Ben Oni, Wolga Gambit, Old Indian or Dutch and some lines of the KID and QID (A47-A49) (for what reason so ever)

This is just a general categorization of the ECO system, if anybody has to add or correct something about it, feel free to do so.
basti1981 133 ( +1 | -1 )
ups spotted a small mistake myself, please ignore my former post :):

helpful link

Message:
www.chessgames.com/chessecohelp.html

there you have an overview over the opening keys

generally speaking the C volume will deal with the open games (e4 e5) and the french defence
B will deal with the semi-open games (e4 not e5) except french of course (french is in the volume C for what reason so ever)
volume D will deal with the closed games (d4 d5), like all the variations of the queens gambit (slav, semi-slav and so on and so forth) the Grunfeld Indian is also included in the volume D (I'm not fully convinced that the Grunfeld Indian should be listed in the volume D, but that's the way things are)
Volume E is more or less dealing with the other Indian defences (KID, QID, NID, Bogo Indian) volume E includes the Catalan (Queen's Gambit), I also don't think, that listing the Catalan under E is fully convincing, but ok, that's the way it is.

Volume A Includes all the other openings not listed under B-E like games starting with 1. d4 or 1. e4 (like English, Reti or Bird's Opening) as well as Ben Oni, Wolga Gambit, Old Indian or Dutch and some lines of the KID and QID (A47-A49) (for what reason so ever)

This is just a general categorization of the ECO system, if anybody has to add or correct something about it, feel free to do so.