user-1: The Grob is a white opening which starts with 1.g4.
The Borg(reversed Grob) is a black opening which goes 1.e4 g5, or 1.d4 g5.
Since White is a tempo up in the Borg, what difference will this make? And what is the significance of the difference?

user12873: Well for 1.d4, White's able to win a pawn outright with 2.Bxg5. In 1.e4, the extra tempo gives White better chances to capitalize on Black's dubious move.

-1: <p>The Grob is a white opening which starts with 1.g4.</p>
<p>The Borg(reversed Grob) is a black opening which goes 1.e4 g5, or 1.d4 g5.</p>
<p>Since White is a tempo up in the Borg, what difference will this make? And what is the significance of the difference?</p>
 12873: <p>Well for 1.d4, White's able to win a pawn outright with 2.Bxg5. In 1.e4, the extra tempo gives White better chances to capitalize on Black's dubious move.</p>
