Or 3.Re1 Bf5 , intending 4...g5, as well as ...Qe6-g4.

Thanks to the exposed enemy king Black is clearly better.

White prepares Be1-g3 in order to improve the bishop and reinforce the kingside defence.

Increasing the pressure towards the enemy queenside.

White has seized the initiative.

With the mission of clearing the long diagonal for the bishop.

Of course. Any other move permits 2 Bd4 virtually burying the bishop on b7.

5.Bxh2 Qxd4
5.Kxh2 Bxb4!

With a sound extra pawn, Black is winning.