Here is a good, solid, reliable answer to the Jobava. The setup is a reversed Carsbad structure, where ...a6 is not a terribly useful move, but white's knight shouldn't be on c3, either.
Theory? No need for it. If you are familiar with the Carlsbad & the ideas for both sides (and you should!) you can easily play this as Black.
What is blacks best move after Bf4? I will try this line versus a 2260 in a club championship and I´m trying to find out which line is the best to play. I know Jobava is a creative player but are his line playable If white is striving for an advantage? All answers are appreciated
Firstly, it's not the Jobava-Prie attack, or the Jobava line or any other opening with Jobava's name in it, and as far as I know Jobava has never claimed it is. The correct name for the opening is Mark's Opening.
Bf5 is probably the best 3rd move for black.
With the c5 line, white is probably better playing 5 Nb5, rather than immediately taking the pawn, threatening Nc7, forcing black to put his knight on the edge of the board on a6.