Finished copying out the ECO code and put it up as a PDF

https://chessnerd.net/eco-code.pdf

This is not the ECO, of course, but the code, which is the same across editions. It describes the contents of the ECO, as well as any openings that fall within that code.

In the future I hope to update it to include checks and captures, as well as to update the opening names with those from chesscom. Over time I'll be adding in the actual openings underneath their respective codes, also in figurine notation.

EDIT: Changed the URL.

Actually, not all editions are the same.  Modifications have been made over time.

A prime example is the 2nd edition of ECO C in 1981 vs today where I think we are now in edition 5?

Back then, 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 and back then, 6...Ne7 7.Qg4 was C18 while 7.a4 and 7.Nf3 was C19 (Not sure where 7.h4 fell then).

Today, all of 6...Ne7, including 7.Qg4, is C19.  And a shift was made where what C16-C17 used to cover now spans across C16-C18, like I think, not positive, that 6...Qc7 moved to C18.

Point is changes have occurred over time.

I'm glad the version I was copying off of was from 2015, then. But it does make me wonder about putting up entries from the first edition of the actual ECO on my site. Finally decided against putting up lines from the newer ECO editions, as that was probably going too far. I figured putting up the actual entries from the 70s wouldn't bother anyone. But they don't fit with the ECO code anymore. I hadn't thought of that.

Is the first edition even relevant to anyone? I figured it would have aged gracefully.

@1

"I hope to update it to include checks and captures"
++ x and + were omittted to save print. Also pawn ranks: ed instead of exd4+

"update the opening names with those from chesscom"
One of the advantages of ECO is that it is independent of language and customs.
Pirc = Yugoslav Defence = Ufimtsev
Ruy Lopez = Spanish
Giuoco Piano = Italian
Traxler = Wilkes Barry

I'm certainly aware of that, and I realize that it takes away from it to a degree. But there's a few considerations. First off, this particular version of the ECO code (which came with the downloadable version of the SECO) also has names for the individual codes. So, for instance, A01 is Larsen's Opening. I could leave it like that, except my goal is to include all the named openings that I can find within their respective codes. It was what I had always assumed was out there, if I could just find it -- and later discovered it actually didn't exist. There's two camps: the ECO code itself, or just the named openings sorted by code. But that's not what people want. If they just get the named openings they're not really getting the ECO code -- or the Encyclopaedia of Chess Openings itself -- in the slightest. If they get just the code, they're not getting answers to their most basic questions: what the openings are and where they fall within the taxonomy. And even then other efforts fall short in formatting, and in extensibility.

The answer to this, I discovered, was to re-do all the named ECO codes to reflect the chesscom named openings, and then to go through the massive list of named openings that can be found at morphychess (at, I think, github) and run them through the analysis page over here, so that every named opening followed the same system. It *is* a kludge, but it connects the dots for people.