Every time when as White I play <3.Bb5> and not <3.Bc4>, the same thought worries me: What if suddenly <3...Nf6>?

"So what?" you ask. Sure this move holds no particular threat for White? Yes and no.

Although the e-pawn is under attack, White can quietly castle: <4.O-O>. In itself the threat to take the e-pawn is not a terrible one, but after <4...Nxe4 5.d4 Nd6>, whether you want it or not, you must sacrifice a pawn in the sharp variation <6.dxe5 Nxb5 7.a4 d6 8.e6 fxe6 9.axb5 Ne7> with a complicated play. In other words, a gambit willy-nilly.

And if you are not in mood sacrificing, then you can expect a quick draw. My game with Pilnik is a model for this.

But do not expect that the draw will just fall from the sky: Black still has to fight for it. This should be kept in mind and pointless exchanges should be scrupulously avoided. The correct way is to aim for an edgame with oposite collor bishops.

My last recommendation for White in this variation is the Q-knight route <Nb1-c3-e2-f4>. This is how Fischer plays it. But Black also has his supporters. I once saw Spassky confidantly gain half a point in this opening variation. At the same time, he thought carefully about his every move!

If you have time, check if the pawn ending is won. That's a very difficult problem, although there is a solution.