Two Knights, Fritz Variation

 So if it happens my opponent knows this there is no way to manage a good posistion?and i think in the posiistion above i have to play Be6 if i want my rook so then white exchange on e6..i love Nd4 but i want to find here a medicine..You play it only in blitz?

Nobody moves their Bishop back home to F1 at any time-control. The line is too obscure to study for white so you're safe unless you start winning too much at the club.

ok i will try it from time to time i also like the 5...b5 variation but i think this line loses again with Bf1..whatever i play and the main line 5...Na5

I think 10...Qe7+ is a better position for black. 

well if white plays the 2 N attack he/she should have Bf1 in mind in the uhlvestad/fritz

It appears that in this Fritz+Ulvestad variation, Black holds his attacked knight by attacking white's knight. But what if white simply captures the knight, or protects his one (e.g. h4)? I have put the capture in a computer, and white seems to have material up.

white should have killed the horse, sacrificed the queen, and killed theirs in retaliation. you need to sacrifice if it achieves advantage.

Black seems to do okay.

https://lichess.org/study/UsPt6Gm8

A couple of GMs

Here's a game of mine against the OP where I moved my B back to f1.

https://www.chess.com/game/daily/62739944

I also moved my pawn to h4, which the chess.com computer thinks is an inaccuracy, though the reason is the same as in many variations of the King's Gambit: to deny the Black Queen Qh4 pressuring the White kingside.

For these types of games, the whole point of this sequence is to fork your queen and rook. You can do 9. Bc4 to forcefully win your opponent's queen.