Haven't seen this before... strikes me as poor play, as white I'd probably trade bishops and force the black knight to the outside of the board right away, leaving me with total control of the center and black with not much to speak of.
Regardless of what the proper response is; in game explorer, it says white has won 75% of master games where this was played. (A grand total of 16.)
It might work on chess.com because we're not masters, but I'd be a bit surprised if you found it successful.
I have more information about it with games. The first player that used it was Hans Cohn. He lived in Guatemala and He was born in Germany. I think years 40s.
I have played it a few times. There are over two dozen games with this opening in some of the larger databases.
I have had three games where I met ...Ba6 with 3.Bxa6, which does look best.
<<<<<<<<<<<i know
I kposssible now the game for black could be closed but, I won a game and I found games where black won and they aren´t exist in data bases. This defense it´s possible playing as a surprise element for shocking the other oponnent. Best wishes!
I
i
I want to know new comments about it... best wishes!
Merry Xmas From Guatemala...!!!
2...Ba6?! is at the half-way between an inaccuracy and a mistake. It's similar to a bad gambit. 
I didn't know this was an opening in an of itself, but I have given it some thought.
The way that i see it is thus:
The aim is to trade black's queen bishop for white's king bishop, which is considered more valuable in attacking.
This doesn't mean it hasn't drawbacks. The knight, while developing, doesn't do so very well, and the rook is vulnerable to counterattack due to the pawn structure, and white holds the center.
There is also the Guatemala attack discussed here 
:
https://www.chess.com/forum/view/chess-openings/barium-graz-guatemala-attack
Has anyone ever given the Guatemala Defense a try? Ive tried researching it and found very little information on it, so if I could get some input that would be great.