Chess Opening Theory/1. e4/1...c6/2. Bc4/2...d5/3. Bb3

3.Bb3
The only sensible continuation to the Hillbilly Attack, since after 3.exd5 cxd5, White ends up losing a tempo with no clear benefit. Here, White gambits the e-pawn, trying to get an attack. Black, following the ideas of the Caro-Kann, will usually take 3...dxe4, accepting the gambit.

The most common continuation after 3...dxe4 is 4. Qh5. While this threatens Scholar's Mate if Black blunders with 4...e5?? or 4...Bd7??, there is no serious threat of checkmate at present (if, say, 4...Nf6?! 5. Qxf7+, the king can move to d6). Still, it would be wise for Black to protect the f7 pawn with 4...g6 or 4...e6.

4.Nc3, attacking the e4 pawn while keeping pressure on f7, is the next most common move.