You serious going to compare the latvian with the Owen's? SERIOUSLY? Latvian is objectively busted. At best black might limp home to a nasty draw being 1.2 down the whole game. Owen's at worst is 0.4-0.5
So I guess that's why the Latvian Gambit is still popular in Correspondence Chess, because it's busted, huh? If you are going to tell me that I'm making an invalid argument about Owen's Defense, I'm going to throw it right back at you with your invalid argument about the Latvian Gambit. Even Tony Kosten says "The Latvian Gambit Lives".
However, despite this, I still claim it is highly dubious, once again, because "Sound" and "Refuted" are not the only two ways to describe an opening, and only someone who is naive will assume that "dubious" has only one degree, and that it's 3 fixed points. No! There are different levels of dubiousness. Just like how there are different levels of high blood pressure, or high cholesterol, or different levels of being on the spectrum, or different degrees of crime.
The Latvian may be MORE DUBIOUS than Owen's Defense, but yes, they are both dubious, as are the Fajarowicz, 5...Nxd5 in the 4.Ng5 Two Knights, the St. George Defense, the Elshad System (both the one for Black and the one for White), and the Closed Benoni (not to be confused with the Czech Benoni), along with numerous others and the list is way too long to spell them all out.
Who the hell plays the latvian in correspondence chess?
ICCF players. Not chess.com scrubs.
Which ICCF players?
Let's see. This is strictly games that ended in the month of May
Ivo Graber (2217) played it
Masuzyo Chilwesa played it.
April
Zdeno Barbalic (2081) played it
Eric Lebeveu (1490) played it
If I look at all games that ended in 2019 (64282 games):
It was played 43 times in games that ended in 2019. Black won 7 of them with 4 draws.
So white won 74% of games while black only won 16%, yeah sure that's not busted
Most people who play chess are classically trained, @ThrillerFan, and the Owen simply doesn't work that way. Unlike some openings (like the French Defense) which kind of work in both a classical and hypermodern sense (though better in the latter, in my experience), the Owen Defense does NOT work if playing in the classical style.
John Owen beat Wilhelm Steinitz with this defense. I know at least one local GM in my area plays it as his standard. It's neither dubious nor unsound, it just has to be played in the hypermodern style, which many folks (including the Expert level) never bother to learn.
Steinitz & Tarrasch proved you can get to low-master level (about 2200 rating) without knowing a lick about hypermodernism, but you can't play hypermodern openings effectively with Tarrasch's dogmatic approach. I would not have been able to use it effectively before I read My System, but since I have it has become a very effective weapon for me.
which GM is that? Bauer, Miezis, Akobian, Blatny?