I've been using the game explorer db here and notice that when a game's opening is listed as "undefined" it just means that no one labeled the opening.  I looked today at a game between Jonny Hector and Evgenij Agrest, which is listed as undefined but is a Semi-Slav.

 

Is there a way we can label these games?  It would take some time but eventually we could accurately label some chunk of these games.  I think it would make the db a lot more useful.

 

here's the game, but I've seen a bunch of undefined games that are pretty easy to define:

 

Oh, wow, it is right there in the pgn, but in the list of games its shown as undefined.

OK, so I'm confused about this.  As Fezzik points out, the opening is in the PGN-- often at least.  But when you look at the list of games you see lot of A - 00 Undefined games, even though their pgn will have it in it.

 

for example:

(and not pick out Jonny Hector, but he makes the case easily)

http://www.chess.com/games/search.html?sort=6&p1=Hector+Jonny

 

http://www.chess.com/games/view.html?id=1158703#

 

But if you just opening the pgn you get ECO C47:

this seems fixable, and by this I mean the listing of the game as undefined on the games list.