Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bc4/3...Nf6/4. Ng5/4...Bc5/5. d4/5...d5/6. Bxd5

6. Bxd5
Here Black can capture with Nxd5 and neutralize White's threat. Black is one pawn down but still has attacking chances, after 7. dxc5 Nb4, for example.

Black can also try Nxd4!? here, allowing 7. Nxf7 because after 7...Qe7 8. Nxh8 sacrificing the rook, 8...Bg4! 9. Qd2 Nxd5 10. exd5 (trading the bishop for the knight) and 10...Bf5, the fork on c2 is inevitable and Black will win back the rook. However, if White plays 7. Bxf7 instead, Black will find themself down a pawn in an uncomfortable, albeit not losing, position.